Peroneal Tendon Tears and Surgery: An Orthopedic Foot and Ankle Surgeon's Complete Guide
- sarangndesai
- Jul 25
- 28 min read
Updated: Aug 7
The Ankle Pain That Gets Blamed on Everything Else
You've been dealing with pain on the outside of your ankle. Maybe it started after a bad ankle sprain. Maybe it came on gradually over months of running, hiking, or playing sports. You've been told it's a sprain that hasn't healed, or tendinitis, or "just inflammation." You've tried rest, ice, braces, maybe even a cortisone shot. But the pain keeps coming back — especially when you push off, change direction, or walk on uneven ground.
If this sounds familiar, there's a good chance the problem is your peroneal tendons. And you're not alone in having it missed — peroneal tendon injuries are one of the most underdiagnosed conditions in foot and ankle medicine. They're frequently mistaken for chronic ankle sprains, and the average delay from symptom onset to correct diagnosis can be years.
I'm Dr. Sarang Desai, a fellowship-trained orthopedic foot and ankle surgeon in McKinney and Flower Mound, Texas. As a professional sports team physician and former University of Texas All-American athlete, I understand what it means to have an ankle that won't let you perform. Peroneal tendon disorders are one of my areas of particular expertise — I see them regularly in athletes, active adults, and people who've been bouncing from doctor to doctor without answers.
This guide will explain what the peroneal tendons are, why they get injured, how we diagnose the problem, and what the treatment options look like — from conservative management to surgical repair and reconstruction.
Related guides:
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What Are the Peroneal Tendons?
You have two peroneal tendons on the outside of each ankle:
Peroneus brevis — the shorter one. It runs behind the fibula (the outside ankle bone), through a groove on the back of the fibula, and attaches to the base of the fifth metatarsal (the bump on the outside of your midfoot). Its main job is to evert the foot — turn the sole outward — and stabilize the ankle against inversion (rolling inward).
Peroneus longus — the longer one. It follows the same path behind the fibula but then dives underneath the foot, crossing the sole to attach to the base of the first metatarsal and medial cuneiform on the inside of the foot. It helps stabilize the arch and assists with pushing off during walking and running.
Both tendons run through a shared tunnel behind the fibula called the retromalleolar groove. They're held in place by a band of tissue called the superior peroneal retinaculum (SPR) — think of it as a seatbelt that keeps the tendons from popping out of their groove.
Here's why this anatomy matters: the peroneal tendons are the primary dynamic stabilizers of the lateral ankle. They work constantly to prevent your ankle from rolling inward. Every step, every cut, every landing — the peroneals are firing. When they're injured, the ankle loses a critical layer of stability, which is why peroneal tendon problems and chronic ankle instability so often go hand in hand.
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Types of Peroneal Tendon Disorders
Peroneal tendon problems come in several forms, and understanding which type you have is essential for choosing the right treatment.
Peroneal Tenosynovitis
This is inflammation of the tendon sheath — the lining that surrounds the tendons. It's the mildest form of peroneal tendon disorder and typically responds to conservative treatment. Patients have pain and swelling behind the fibula that worsens with activity.
Tears of the peroneal tendons are more common than most people realize. The peroneus brevis is torn far more often than the longus. These are usually longitudinal split tears — the tendon splits lengthwise rather than snapping in half. They can range from small partial tears to complete ruptures.
The Redfern and Myerson classification is the system I use to guide surgical decision-making:
- Type I: Both tendons are grossly intact, but one has a longitudinal tear. Treatment involves excision of the torn portion and tubularization (sewing the tendon back into a tube shape).
- Type II: One tendon is irreparably torn. Treatment involves tenodesis — connecting the stump of the torn tendon to the intact tendon so it can still function.
- Type III: Both tendons are torn and unusable. Treatment depends on whether the proximal muscle still has excursion (the ability to pull). If it does, a tendon transfer or allograft reconstruction is performed. If it doesn't, a tendon transfer (typically the FDL or FHL tendon) is the best option.
Peroneal Tendon Subluxation and Dislocation
This is a different problem entirely. Instead of a tear within the tendon, the tendons are popping out of their groove behind the fibula. This happens when the superior peroneal retinaculum (the "seatbelt") is torn or stretched, or when the retromalleolar groove is too shallow or convex (instead of concave).
Patients describe a painful snapping or popping sensation behind the outside ankle bone, especially with dorsiflexion and eversion. In athletes, this often happens during a sudden forceful contraction of the peroneals — like landing from a jump or abruptly stopping.
There's also a subtype called intrasheath subluxation — the tendons don't actually leave the groove, but they switch positions within it (the longus slides underneath the brevis). This causes a painful click and is often missed because the tendons can't be reproduced subluxating out of the groove on exam. Dynamic ultrasound is the key to diagnosing this.
Peroneal Tendinopathy (Tendinosis)
This is chronic degeneration of the tendon without acute tearing — the tendon becomes thickened, scarred, and painful from repetitive overuse. It's common in runners and athletes who do a lot of lateral movement.
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Why Did This Happen?
Ankle Sprains
The most common cause. When the ankle rolls inward (inversion sprain), the peroneal tendons are violently stretched. This can cause acute tears, tenosynovitis, or damage to the superior peroneal retinaculum. Peroneal tendon injuries are commonly mistaken for or occur concomitantly with lateral ankle sprains — which is why so many are missed initially. For more on ankle sprains and their consequences, see my ankle sprain guide.
Chronic Ankle Instability
When the lateral ligaments are torn and the ankle is chronically unstable, the peroneal tendons have to work overtime to compensate. This repetitive overload leads to tendinopathy and eventually tears. As I discuss in my chronic ankle instability guide, peroneal tendon pathology is one of the most common associated findings in patients with chronic instability.
Hindfoot Varus (Cavovarus Foot)
This is a critically important and often overlooked factor. A varus (inward-tilted) hindfoot places increased stress on the peroneal tendons with every step. Studies have shown that hindfoot varus is associated with significantly poorer outcomes after peroneal tendon repair — patients with varus alignment had AOFAS scores of 82 compared to 93 in patients with valgus alignment. If the underlying alignment isn't corrected, the repair is set up to fail.
Anatomic Variants
Some people are anatomically predisposed to peroneal tendon problems:
- Flat or convex retromalleolar groove — instead of a concave channel that cradles the tendons, the groove is flat or even convex, making subluxation more likely
- Low-lying peroneus brevis muscle belly — muscle tissue extending too far distally crowds the groove
- Peroneus quartus — an accessory muscle present in about 10-20% of people that takes up space in the groove
- Hypertrophied peroneal tubercle — a bony prominence on the calcaneus that can impinge on the tendons
- Os peroneum — an accessory bone within the peroneus longus tendon that can fracture or cause impingement
Repetitive Overuse
Runners, dancers, basketball players, soccer players, and anyone who does repetitive ankle motion can develop peroneal tendinopathy over time, even without a specific injury.
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Symptoms: What Does a Peroneal Tendon Problem Feel Like?
Pain behind and below the outside ankle bone. This is the hallmark. The pain is along the course of the peroneal tendons — starting behind the fibula and extending along the outside of the hindfoot. It's different from the pain of a lateral ligament sprain, which is typically more in front of and below the fibula.
Pain that worsens with activity. Especially pushing off, cutting, pivoting, walking on uneven surfaces, or going downhill. The tendons are working hardest during these movements.
Swelling along the outside of the ankle. Often a sausage-shaped fullness behind the fibula, following the course of the tendons.
Snapping or popping. If the tendons are subluxating, you may feel (and sometimes see) them snapping over the back of the fibula. This is often reproducible — you can make it happen by rotating your foot.
Weakness with eversion. Difficulty pushing the foot outward against resistance. The ankle may feel unstable, especially on uneven ground.
Pain with resisted eversion. When I ask you to push your foot outward while I resist the motion, it reproduces the pain — this is one of the most reliable exam findings.
The key pattern: Lateral ankle pain that's behind the fibula (not in front of it), worsens with activity, and is associated with swelling, weakness, or snapping — think peroneal tendons.
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How Is a Peroneal Tendon Injury Diagnosed?
Physical Exam
The physical exam is the most important diagnostic tool for peroneal tendon disorders. Here's what I look for:
- Tenderness along the peroneal tendons — behind and below the fibula, along the lateral hindfoot
- Pain with resisted eversion — the single most reliable test
- Pain with passive inversion and dorsiflexion stretch — stretching the tendons reproduces symptoms
- Subluxation testing — I ask the patient to dorsiflex and evert the foot while I palpate behind the fibula. If the tendons pop out of the groove, the diagnosis of subluxation is confirmed
- Hindfoot alignment — I assess for varus (inward tilt) of the heel, which is a risk factor for peroneal problems and affects treatment planning
- Ankle stability testing — anterior drawer and talar tilt tests to evaluate for associated chronic ankle instability
- Peroneal tubercle tenderness — palpation of the lateral calcaneus for impingement
Imaging
X-rays. Weight-bearing foot and ankle X-rays are the starting point. I'm looking for:
- Hindfoot alignment (varus vs. valgus)
- Os peroneum (an accessory bone in the peroneus longus)
- Avulsion fractures at the base of the fifth metatarsal (which can mimic peroneal tendon pain — see my Jones fracture guide)
- A fleck sign (small bone fragment behind the fibula suggesting SPR avulsion)
MRI. The standard imaging study for evaluating peroneal tendon pathology. MRI shows:
- Tendon tears (partial or complete)
- Tenosynovitis (fluid around the tendons)
- Tendinosis (thickening and signal changes within the tendon)
- Superior peroneal retinaculum integrity
- Retromalleolar groove morphology
- Associated pathology (lateral ligament tears, osteochondral lesions)
However, MRI can miss some peroneal tendon pathology — particularly small longitudinal tears and intrasheath subluxation. The sensitivity of MRI for peroneal tendon tears is approximately 83%, meaning about 1 in 6 tears are missed.
Ultrasound. Dynamic ultrasound is particularly valuable for peroneal tendon disorders because it allows real-time evaluation of the tendons during movement. It's the gold standard for diagnosing:
- Subluxation and dislocation (you can watch the tendons pop out of the groove in real time)
- Intrasheath subluxation (the tendons switch positions within the groove)
- Longitudinal tears that may be missed on MRI
I use ultrasound frequently in clinic as a complement to MRI, especially when subluxation is suspected.
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Nonoperative Treatment: When and How
Not every peroneal tendon problem needs surgery. For tenosynovitis and mild tendinopathy, conservative treatment is the appropriate first step.
What Nonoperative Treatment Involves
Activity modification. Reducing activities that stress the peroneal tendons — cutting, pivoting, running on uneven surfaces.
Immobilization. For acute tenosynovitis or flare-ups, a walking boot for 2-4 weeks can calm things down significantly.
Orthotics. Laterally posted orthotics (with a lateral heel wedge) can offload the peroneal tendons by correcting hindfoot varus. This is particularly important in patients with a cavovarus foot type.
Physical therapy. Progressive tendon loading exercises, ankle strengthening, proprioception training, and peroneal-specific rehabilitation. Eccentric exercises are recommended over concentric exercises for tendinopathy.
Anti-inflammatory medications. NSAIDs for short-term symptom management.
Corticosteroid injections. These can provide temporary relief for tenosynovitis but should be used cautiously. Injections directly into weight-bearing tendons are not recommended because of the increased risk of rupture. If I use a steroid injection, it's placed in the tendon sheath (around the tendon, not into it), and I counsel patients about the risks.
When Nonoperative Treatment Works — and When It Doesn't
Peroneal tenosynovitis typically responds to conservative therapy. Most patients improve with 6-12 weeks of activity modification, immobilization, and physical therapy.
However, operative treatment is frequently required for:
- Peroneal tendon tears — partial tears may respond to conservative treatment, but significant tears (especially those causing weakness or mechanical symptoms) usually need surgical repair
- Peroneal tendon subluxation/dislocation — conservative treatment has a high failure rate for recurrent subluxation, especially in athletes. Surgery is often indicated as the primary treatment in active patients with recurrent symptomatic subluxation
- Failed conservative treatment — if 3-6 months of appropriate nonoperative management hasn't resolved symptoms, surgery should be considered
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Surgical Treatment: Matching the Procedure to the Problem
This is where having a surgeon who understands the full spectrum of peroneal tendon pathology matters. The right surgery depends entirely on what's found — and sometimes the final decision is made intraoperatively based on what the tendons actually look like.
Surgery for Peroneal Tendon Tears
The surgical approach is dictated by the severity of the tear:
Tears involving less than 50% of the tendon → Debridement and Primary Repair
The damaged portion of the tendon is excised, and the remaining healthy tendon is repaired and tubularized (sewn back into a cylindrical shape). This is the most common procedure I perform for peroneal tendon tears.
The long-term results are excellent. A study with an average follow-up of 6.5 years found significant improvement in pain scores (from 39 to 10 on VAS) and functional scores, with 17 of 18 patients returning to full sporting activity without limitation and no reoperations during the follow-up period.
A larger study of 201 patients who underwent primary repair of the peroneus brevis found that 83% returned to regular exercise and sports, 77% returned to the same preinjury activities at one year, and 86% were satisfied with their outcome. 91% said they would choose to have the surgery again.
Tears involving more than 50% of the tendon → Tenodesis
When more than half the tendon is destroyed, primary repair isn't viable — there's not enough healthy tissue left to sew together. In this case, I perform a tenodesis: the stump of the irreparably torn tendon is sewn to the adjacent intact peroneal tendon. This allows the intact tendon to take over the function of both.
Return to activity after tenodesis occurs within 12 weeks in 70-80% of patients.
Both tendons torn → Tendon Transfer or Allograft Reconstruction
This is the most complex scenario. When both peroneal tendons are unusable, I evaluate whether the proximal muscle still has excursion (the ability to contract and pull). If it does, a one-stage allograft reconstruction or tendon transfer (using the FDL or FHL tendon) can restore function. If there's significant scarring of the tissue bed, a staged reconstruction with a silicone rod spacer may be necessary — the rod is placed first to create a smooth tunnel, and the graft is placed in a second surgery weeks later.
Surgery for Peroneal Tendon Subluxation/Dislocation
The goal is to keep the tendons in their groove. This involves two components:
1. Repair or reconstruction of the superior peroneal retinaculum (SPR). The torn or stretched retinaculum is repaired back to the fibula, restoring the "seatbelt" that holds the tendons in place.
2. Deepening of the retromalleolar groove. If the groove is flat or convex (which is the case in most patients with subluxation), I deepen it to create a concave channel that properly cradles the tendons. Studies show that patients treated with both groove deepening and SPR repair have significantly higher rates of return to sport than those treated with SPR repair alone.
A study of 18 patients who underwent groove deepening with SPR repair found significant improvement in all outcome scores, with all patients recovering their normal gait and no recurrences at 2-4 years of follow-up.
For intrasheath subluxation specifically, groove deepening with retinacular reefing is highly effective — one study showed AOFAS scores improving from 61 to 93, with 13 of 14 patients achieving good or excellent results.
The redislocation rate after properly performed surgical treatment is less than 1.5% at long-term follow-up.
Tendoscopic (minimally invasive) approach. In selected cases, the retinaculum can be repaired through a tendoscopic approach — using small incisions and a camera to visualize and repair the structures. Studies suggest this approach may allow earlier return to sport (about 12 weeks) compared to open surgery (about 13 weeks), though the difference is modest and the technique is more demanding.
Addressing Associated Pathology
This is where my approach differs from surgeons who treat peroneal tendons in isolation. I always evaluate and address:
Chronic ankle instability. If the lateral ligaments are torn and the ankle is unstable, I perform a Broström repair at the same time as the peroneal tendon procedure. Leaving the ankle unstable will overload the repaired tendons and lead to failure.
Hindfoot varus. If the heel is tilted inward, the peroneal tendons are under constant increased stress. A lateralizing calcaneal osteotomy (shifting the heel bone outward) may be necessary to protect the repair. Studies confirm that varus alignment is associated with significantly poorer outcomes after peroneal tendon surgery.
Osteochondral lesions. Cartilage damage inside the ankle joint frequently coexists with peroneal tendon pathology, especially in patients with chronic instability. I evaluate for this with MRI and address it at the time of surgery if present. See my ankle cartilage injury guide for more on this.
Low-lying muscle belly or peroneus quartus. If there's an accessory muscle or a low-lying muscle belly crowding the groove, it's excised to create more space for the tendons.
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What Happens During Surgery: A Step-by-Step Overview
Here's what a typical peroneal tendon surgery looks like:
1. Anesthesia. General anesthesia or regional nerve block. The surgery is outpatient — you go home the same day.
2. Incision. A curvilinear incision is made along the course of the peroneal tendons, behind and below the fibula.
3. Expose the tendons. The superior peroneal retinaculum is opened (or is already torn), and the tendons are delivered from their groove for inspection.
4. Assess the damage. This is the critical step. I evaluate:
- The quality and extent of any tendon tears
- The integrity of the superior peroneal retinaculum
- The depth and shape of the retromalleolar groove
- The presence of a low-lying muscle belly, peroneus quartus, or other anatomic variants
- The condition of the tendon sheath (tenosynovitis)
5. Treat the tendons. Based on what I find:
- Debride and tubularize partial tears (< 50%)
- Tenodesis for irreparable single-tendon tears (> 50%)
- Tendon transfer or allograft for both tendons torn
6. Address the groove (if subluxation is present). Deepen the retromalleolar groove using a burr to create a concave channel.
7. Repair the retinaculum. The SPR is repaired back to the fibula with suture anchors, restoring the restraint that keeps the tendons in their groove.
8. Address associated pathology. Broström repair for instability, calcaneal osteotomy for varus, excision of accessory muscle, etc.
9. Closure and splinting. The wound is closed in layers and a posterior splint is applied.
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Recovery: What to Expect
Recovery depends on the specific procedure performed and whether additional procedures (like a Broström repair or calcaneal osteotomy) were done at the same time.
After Tendon Debridement and Repair (Without Retinacular Repair)
Weeks 0-2: Posterior splint, non-weight-bearing. Elevation and ice.
Weeks 2-4: Transition to walking boot. Begin gentle range of motion — but no active eversion yet. Weight-bearing as tolerated in the boot.
Weeks 4-6: Progressive ankle motion. Begin gentle strengthening. Continue boot for protection.
Weeks 6-8: Wean from boot. Begin peroneal strengthening, balance training, proprioception exercises.
Weeks 8-12: Progressive return to activity. Sport-specific training begins.
Weeks 12-16: Return to sport for most patients.
After Tendon Repair WITH Retinacular Repair or Groove Deepening
The timeline is slightly more conservative because the retinaculum needs to heal:
Weeks 0-2: Non-weight-bearing in a cast or splint.
Weeks 2-6: Weight-bearing in a cast or boot. No active peroneal contraction (no eversion) until 6 weeks — the retinaculum needs time to heal before the tendons start pulling against it.
Weeks 6-8: Begin active eversion. Progressive strengthening.
Weeks 8-12: Wean from boot. Balance training, proprioception, sport-specific exercises.
Weeks 12-16: Return to sport.
After Tendon Transfer or Allograft Reconstruction
Weeks 0-6: Non-weight-bearing in a cast or boot. No active motion of the transferred tendon.
Weeks 6-10: Progressive weight-bearing. Begin gentle active motion.
Weeks 10-16: Strengthening, balance training, functional rehabilitation.
Weeks 16-24: Return to sport. More complex reconstructions require longer rehabilitation.
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Return to Sport by Activity
Basketball, Soccer, Football, Volleyball
- After tendon repair: 3-4 months
- After subluxation surgery: 3-4 months
- After tendon transfer/reconstruction: 5-6 months
- Key concern: Cutting, pivoting, and lateral movement are the most demanding activities for the peroneal tendons. Full peroneal strength must be restored before clearance.
Running
- After tendon repair: 2-3 months
- After subluxation surgery: 3 months
- Key concern: Start on flat surfaces. Trail running (with uneven terrain) should wait an additional 2-4 weeks after road running is comfortable. Runners should also be aware of stress fractures, which can develop during the return-to-running phase if progression is too aggressive.
Pickleball and Tennis
- After tendon repair: 3-4 months
- After subluxation surgery: 3-4 months
- Key concern: Lateral lunging and quick direction changes. Court shoes with good lateral support are essential. Players in this age group should also be aware of Achilles tendon injuries, which are common in the same demographic.
Golf
- After tendon repair: 2-3 months
- After subluxation surgery: 3 months
- Key concern: Rotational loading through the trail ankle during the swing.
CrossFit
- After tendon repair: 3-4 months
- After subluxation surgery: 3-4 months
- Key concern: Box jumps, lateral movements, and single-leg exercises. Modify as needed for the first month after clearance.
Dance and Gymnastics
- After tendon repair: 3-4 months
- After subluxation surgery: 4-5 months
- Key concern: Relevé, pointe work, and landing mechanics. These sports require full peroneal strength and proprioception before return.
Baseball
- After tendon repair: 2-3 months
- After subluxation surgery: 3 months
- Key concern: Base running and fielding require lateral agility. Pitchers need full lower extremity stability for the push-off phase.
For a comprehensive overview of return-to-sport considerations across all foot and ankle injuries, see my Pro Sports Team Physician's Guide to Foot and Ankle Sports Injuries.
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Common Mistakes I See
Mistake #1: Calling It "Just a Sprain" for Months
Peroneal tendon injuries are commonly mistaken for chronic ankle sprains. The pain is in a similar area (outside of the ankle), and both can follow an inversion injury. But the treatment is different. If lateral ankle pain persists beyond 6-8 weeks after a sprain — especially if it's behind the fibula rather than in front of it — peroneal tendon pathology should be on the differential.
Mistake #2: Missing the Diagnosis on MRI
MRI misses approximately 1 in 6 peroneal tendon tears. If the clinical exam strongly suggests a peroneal tendon problem but the MRI is "normal," don't dismiss the diagnosis. Dynamic ultrasound can pick up pathology that MRI misses, and sometimes the definitive diagnosis is made at the time of surgery.
Mistake #3: Injecting Steroids Into the Tendon
Corticosteroid injections directly into weight-bearing tendons increase the risk of rupture. If a steroid injection is used for peroneal tenosynovitis, it should be placed in the tendon sheath — around the tendon, not into it. Even then, I use this sparingly.
Mistake #4: Ignoring Hindfoot Alignment
Repairing a peroneal tendon tear without addressing underlying hindfoot varus is like fixing a tire without aligning the wheels. The varus alignment places constant increased stress on the peroneal tendons, and the repair will eventually fail. Studies confirm that varus alignment is associated with significantly worse outcomes. If the heel is tilted inward, a calcaneal osteotomy should be considered at the time of tendon repair.
Mistake #5: Treating Subluxation Conservatively in Athletes
Conservative treatment for recurrent peroneal tendon subluxation has a high failure rate, especially in active patients. If an athlete has reproducible subluxation with symptoms, surgery is usually the right answer — and the sooner it's done, the better the tendons will look at the time of repair.
Mistake #6: Not Looking for Associated Instability
Peroneal tendon problems and chronic ankle instability frequently coexist. If the ankle ligaments are torn and the ankle is unstable, the peroneal tendons are under constant increased stress. Both problems need to be addressed at the same time for the best outcome.
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Complications
Peroneal tendon surgery is generally safe, but complications can occur:
Persistent lateral ankle pain. The most commonly reported minor complication after peroneal tendon surgery. Some patients have improvement but not complete resolution of pain. Overall clinical outcomes are positive, but the average complication rate across studies is approximately 39%, with the majority being minor (ankle pain accounting for 46% of all minor complications).
Sural nerve irritation. The sural nerve runs near the surgical field and can be stretched or irritated during surgery, causing numbness or tingling along the outside of the foot. This is usually temporary.
Wound complications. The skin on the lateral ankle can be thin, and wound healing issues can occur, particularly in patients who smoke or have diabetes.
Recurrent subluxation. After properly performed groove deepening with SPR repair, the redislocation rate is less than 1.5%. However, inadequate groove deepening or failure to address a flat/convex groove increases the risk of recurrence.
Stiffness. Ankle stiffness can develop, particularly if immobilization is prolonged. Early range of motion (when appropriate based on the procedure) helps prevent this.
Tendon re-tear. Possible, especially if the underlying cause (varus alignment, instability) isn't addressed.
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Peroneal Tendon Tears and Surgery: A Foot and Ankle Surgeon's Complete Guide — Part 2 (Continuation)
Long-Term Prognosis
The long-term outlook after peroneal tendon surgery is generally very good:
- 83-94% of patients return to sport after primary tendon repair
- 86-91% of patients are satisfied with their surgical outcome
- 91% would choose to have the surgery again
- Long-term studies at 6+ years show maintained improvement in pain and function with no reoperations in the majority of patients
- Subluxation surgery has a recurrence rate of less than 1.5% when groove deepening is combined with SPR repair
The key factors that predict a good outcome are:
1. Correct diagnosis (don't miss it)
2. Appropriate surgical technique matched to the pathology
3. Addressing associated conditions (instability, varus alignment)
4. Compliant rehabilitation
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Prevention
Rehabilitate ankle sprains properly. The most important preventive measure. Proper rehabilitation after a sprain — including peroneal strengthening, proprioception training, and balance exercises — protects the peroneal tendons and reduces the risk of chronic instability.
Address ankle instability. If your ankle keeps giving way, the peroneal tendons are working overtime. Get the instability evaluated and treated before the tendons break down.
Wear appropriate footwear. Shoes with good lateral support reduce stress on the peroneal tendons. Avoid worn-out shoes, especially for running and court sports.
Strengthen the peroneals. Eversion exercises with resistance bands, single-leg balance work, and lateral agility drills all strengthen the peroneal tendons and reduce injury risk.
Get evaluated for foot alignment. If you have a high-arched (cavovarus) foot, custom orthotics with a lateral post can offload the peroneal tendons and reduce your risk of tendinopathy and tears.
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Frequently Asked Questions
General Questions
1. What are the peroneal tendons?
Two tendons on the outside of your ankle — the peroneus brevis and peroneus longus — that stabilize the ankle and prevent it from rolling inward. They run behind the fibula (outside ankle bone) and are essential for pushing off, cutting, and walking on uneven ground.
2. How common are peroneal tendon injuries?
More common than most people think. They're frequently missed because they mimic chronic ankle sprains. Studies have found peroneal tendon tears in up to 25-40% of patients undergoing surgery for chronic lateral ankle pain. They should be considered in every patient with persistent lateral ankle pain.
3. What's the difference between a peroneal tendon tear and a peroneal tendon subluxation?
A tear is damage within the tendon itself — the fibers are split or ruptured. Subluxation means the tendons are popping out of their groove behind the fibula. They're different problems with different treatments, though they can occur together.
4. Can peroneal tendon injuries heal on their own?
Tenosynovitis (inflammation of the tendon sheath) often improves with conservative treatment. However, significant tendon tears and subluxation rarely resolve without surgery, especially in active patients. The tendon doesn't have great blood supply in this area, which limits its ability to heal on its own.
5. How long has my peroneal tendon been torn?
Often longer than you think. Many patients have had symptoms for months or even years before the correct diagnosis is made. The average delay from symptom onset to diagnosis of a peroneal tendon tear can be significant — which is one reason I emphasize getting a thorough evaluation if lateral ankle pain isn't resolving.
6. Is a peroneal tendon tear the same as peroneal tendinitis?
No. Tendinitis (or more accurately, tenosynovitis) is inflammation of the tendon sheath. A tear is actual structural damage to the tendon fibers. Tendinitis can progress to a tear over time if left untreated, but they're different conditions with different treatment approaches. For more on tendon disorders in general, see my Achilles tendinitis guide — many of the same principles apply.
7. What is a peroneus quartus?
An accessory (extra) muscle present in about 10-20% of people. It takes up space in the groove behind the fibula and can contribute to crowding, tendon irritation, and subluxation. If it's causing problems, it's excised during surgery.
8. What is an os peroneum?
A small accessory bone (sesamoid) that sits within the peroneus longus tendon. It's present in about 10-20% of people. It can fracture, causing sudden lateral foot pain, or it can cause chronic impingement of the tendon. A fractured os peroneum can be seen on X-ray and is an important clue to peroneus longus pathology.
Diagnosis Questions
9. Why was my peroneal tendon tear missed?
Because peroneal tendon injuries mimic ankle sprains. The pain is on the outside of the ankle, it often follows a twisting injury, and the initial treatment (rest, ice, brace) is the same. Unless someone specifically examines the peroneal tendons and considers the diagnosis, it gets labeled as a "sprain that won't heal." Additionally, MRI misses about 1 in 6 peroneal tendon tears.
10. Can an MRI miss a peroneal tendon tear?
Yes. MRI has a sensitivity of approximately 83% for peroneal tendon tears — meaning about 17% are missed. Small longitudinal split tears and intrasheath subluxation are particularly difficult to see on MRI. If the clinical exam is suspicious, I may add dynamic ultrasound or proceed with surgical exploration.
11. Do I need an MRI?
In most cases, yes. MRI is the standard imaging study for evaluating peroneal tendon pathology. It shows the tendons, the retinaculum, the groove, and any associated pathology (ligament tears, cartilage damage). However, the clinical exam is equally important — I never rely on MRI alone.
12. What is dynamic ultrasound and why is it useful?
Dynamic ultrasound allows me to watch the tendons in real time as you move your ankle. It's the gold standard for diagnosing subluxation (the tendons popping out of the groove) and intrasheath subluxation (the tendons switching positions). It can also pick up tears that MRI misses. I use it frequently in clinic.
13. How do you tell the difference between a peroneal tendon problem and a chronic ankle sprain?
Location is the biggest clue. Peroneal tendon pain is behind the fibula. Lateral ligament sprain pain is in front of and below the fibula. Pain with resisted eversion (pushing the foot outward against resistance) strongly suggests a peroneal tendon problem. Snapping or popping behind the fibula suggests subluxation. And if the pain has persisted for months despite treatment for a "sprain," peroneal tendon pathology should be considered.
Treatment Questions
14. Do all peroneal tendon tears need surgery?
No. Small partial tears with minimal symptoms may respond to conservative treatment — immobilization, physical therapy, and activity modification. However, significant tears (especially those causing weakness, mechanical symptoms, or persistent pain despite conservative treatment) typically require surgery for the best outcome.
15. What happens if I don't get surgery?
For significant tears, the tendon will continue to degenerate over time. The tear may enlarge, the tendon may weaken further, and the ankle may become increasingly unstable. For subluxation, the tendons will continue to pop out of the groove, causing pain and potentially damaging the tendons with each episode. Delaying surgery doesn't make the surgery more dangerous, but it can make the repair more complex if the tendon deteriorates further.
16. Can you fix a peroneal tendon tear arthroscopically?
Peroneal tendon surgery is typically performed through an open incision — the tendons need to be directly visualized and handled for repair. However, tendoscopy (using a small camera in the tendon sheath) can be used in selected cases, particularly for retinacular repair in subluxation. If there's associated ankle joint pathology (like an osteochondral lesion), ankle arthroscopy may be performed at the same time.
17. What is a tenodesis?
A tenodesis is a procedure where the stump of an irreparably torn tendon is sewn to the adjacent intact tendon. For peroneal tendons, if the peroneus brevis is torn beyond repair (more than 50% destroyed), the remaining stump is sewn to the intact peroneus longus. This allows the longus to take over the function of both tendons.
18. What if both peroneal tendons are torn?
This is the most complex scenario but is still treatable. Options include tendon transfer (using the FDL or FHL tendon to replace the peroneal function) or allograft reconstruction (using donor tendon tissue). The choice depends on the condition of the surrounding tissue and whether the proximal muscle still functions.
19. Will I need a cast after surgery?
You'll be in a posterior splint for the first 2 weeks, then transition to a walking boot. A cast may be used instead of a boot in some cases, particularly after subluxation surgery or tendon transfer. Total time in a boot or cast is typically 4-6 weeks for tendon repair and 6-8 weeks for more complex procedures.
20. How long will I be on crutches?
Typically 2-4 weeks for tendon debridement and repair. Up to 6 weeks for tendon transfer or allograft reconstruction. The exact timeline depends on the procedure performed and whether additional procedures (like a calcaneal osteotomy) were done.
21. Can I drive after peroneal tendon surgery?
If it's your left ankle and you drive an automatic, you can usually drive within 1-2 weeks (once you're off narcotic pain medication). If it's your right ankle, you'll need to wait until you're out of the boot and have adequate strength and reaction time — typically 6-8 weeks.
22. Will I need physical therapy?
Yes. Physical therapy is essential for a good outcome. It typically starts at 2-4 weeks after surgery (depending on the procedure) and continues for 2-3 months. The focus is on range of motion, peroneal strengthening, proprioception, balance training, and sport-specific rehabilitation.
Sports Questions
23. Can I run again after peroneal tendon surgery?
Yes. Most patients return to running within 2-3 months after tendon repair and 3 months after subluxation surgery. Start on flat, even surfaces and progress to trails gradually.
24. Can I play basketball/soccer/football after peroneal tendon surgery?
Yes. Return to cutting and pivoting sports typically occurs at 3-4 months after tendon repair or subluxation surgery. Full peroneal strength and proprioception must be restored before clearance. For more on returning to these sports after foot and ankle injuries, see my Pro Sports Team Physician's Guide.
25. I play pickleball — when can I get back on the court?
Typically 3-4 months after surgery. The lateral lunging and quick direction changes in pickleball are demanding on the peroneal tendons. Make sure you have good court shoes with lateral support, and ease back in with doubles before singles.
26. Will my ankle ever be 100% again?
Most patients achieve excellent function after peroneal tendon surgery — 83-94% return to sport, and the majority return to their preinjury activity level. "100%" is hard to define, but the goal is to get you back to doing everything you want to do without pain or limitation. Most patients achieve that.
27. I'm a dancer — will I be able to do pointe work again?
Yes, but it takes patience. Pointe work requires full peroneal strength, ankle stability, and proprioception. Return to pointe typically occurs at 4-5 months after surgery, with a gradual progression from flat work to relevé to full pointe.
Concerns and Worries
28. Is peroneal tendon surgery painful?
The first few days after surgery involve moderate pain that's well-controlled with medication. Most patients say the pain is manageable and significantly less than what they expected. By 2 weeks, most patients are comfortable with over-the-counter pain medication. The surgical pain is typically less than the chronic pain they were living with before surgery.
29. What are the risks of peroneal tendon surgery?
The main risks include persistent lateral ankle pain (the most common minor complication), sural nerve irritation (numbness or tingling along the outside of the foot, usually temporary), wound complications, stiffness, and tendon re-tear. Serious complications are uncommon. The overall complication rate is approximately 39%, but the vast majority are minor.
30. Can the tendon tear again after surgery?
It's possible but uncommon after properly performed surgery — especially if the underlying causes (varus alignment, ankle instability) are addressed. The most important factors in preventing re-tear are correcting the biomechanics and completing rehabilitation.
31. What if I've already had peroneal tendon surgery and it failed?
Revision peroneal tendon surgery is more complex but absolutely doable. The approach depends on why the first surgery failed — was the tear not adequately repaired? Was hindfoot varus not addressed? Was there unrecognized instability? I evaluate the entire picture and develop a comprehensive revision plan. As someone who specializes in complex revision surgery, I see these cases regularly.
32. I've been told I need a tendon transfer — is that a big deal?
It's a bigger surgery than a simple tendon repair, but it's a well-established procedure with good outcomes. The donor tendon (usually the FDL or FHL) is rerouted to take over the function of the peroneal tendons. Recovery is longer (4-6 months to return to sport), but most patients do very well.
33. Will I have a visible scar?
Yes — there will be a scar along the outside of the ankle behind the fibula. It's typically 4-6 inches long for open surgery. The scar fades significantly over 6-12 months and is usually well-hidden by shoes and socks.
34. Can I still wear heels after surgery?
Yes, once you're fully healed (typically 3-4 months). Start with lower heels and progress as comfort allows. High heels place the ankle in a plantarflexed position, which can stress the peroneal tendons — so moderation is reasonable.
35. I'm overweight — does that affect my surgery or recovery?
Higher body weight does place more stress on the peroneal tendons and can affect wound healing. However, it's not a contraindication to surgery. I discuss weight management as part of the overall treatment plan, but I don't withhold surgery from patients who need it based on weight alone.
Questions Spouses and Parents Ask
36. My spouse had an ankle sprain months ago and it's still not better — could this be a peroneal tendon problem?
Absolutely. This is one of the most common presentations I see. If lateral ankle pain persists beyond 6-8 weeks after a sprain — especially if it's behind the fibula, associated with swelling or weakness, or worsens with activity — a peroneal tendon injury should be evaluated. An appointment with a foot and ankle specialist is the right next step.
37. My teenager is an athlete and has a snapping ankle — should I be worried?
A snapping or popping sensation behind the outside ankle bone is the hallmark of peroneal tendon subluxation. In young athletes, this often occurs after an ankle sprain or during sports that involve sudden direction changes. It should be evaluated — subluxation doesn't resolve on its own and can damage the tendons over time.
38. My child's coach says it's just a sprain — how do I know if it's something more?
If the pain is behind the fibula (not in front of it), if there's snapping or popping, if the ankle feels weak or unstable, or if the pain hasn't improved after 6-8 weeks of rest and bracing — it may be more than a sprain. A proper evaluation by a foot and ankle specialist can determine if the peroneal tendons are involved.
39. How long will my spouse/child be out of work or school?
Desk work: 1-2 weeks. Jobs requiring standing or walking: 4-6 weeks. Jobs requiring physical labor: 8-12 weeks. School: most students return within 1-2 weeks with crutches and accommodations.
40. Is this surgery covered by insurance?
Yes. Peroneal tendon repair and reconstruction are medically necessary procedures and are covered by insurance. The specific coverage depends on your plan, but this is not considered elective or cosmetic surgery.
Questions People Are Embarrassed to Ask
41. Did I cause this by not resting enough after my sprain?
Not necessarily. Some peroneal tendon injuries happen at the time of the original sprain — the tendon tears during the same injury that sprains the ligaments. Others develop over time due to chronic instability or repetitive overuse. Either way, the focus should be on getting the right diagnosis and treatment now, not on what you did or didn't do in the past.
42. Am I too old for this surgery?
Age alone is not a contraindication. I perform peroneal tendon surgery on patients in their 60s and 70s who want to stay active. The decision is based on your overall health, activity level, and goals — not a number on your birthday cake.
43. I've been to three doctors and nobody can figure out what's wrong — is that normal?
Unfortunately, yes. Peroneal tendon injuries are one of the most commonly missed diagnoses in foot and ankle medicine. The symptoms overlap with chronic ankle sprains, and not every provider is trained to specifically evaluate the peroneal tendons. If you've been bouncing from doctor to doctor without answers, seeing a fellowship-trained foot and ankle specialist is the right move.
44. Will I become dependent on pain medication after surgery?
I prescribe a short course of narcotic pain medication (typically 3-5 days) for the immediate postoperative period. Most patients transition to over-the-counter medication (Tylenol, ibuprofen) within the first week. Narcotic dependence from a short postoperative course is extremely rare.
45. I'm nervous about surgery — is that normal?
Completely normal. Every patient has some anxiety before surgery. I walk through the entire plan with you in clinic, answer every question, and make sure you feel confident before we proceed. On the day of surgery, the anesthesia team will keep you comfortable, and you won't feel anything during the procedure.
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When to See a Specialist
You should see a fellowship-trained foot and ankle surgeon if:
- You have lateral ankle pain that has persisted for more than 6-8 weeks despite rest and bracing
- You feel snapping or popping behind your outside ankle bone
- Your ankle feels weak or unstable, especially on uneven ground
- You've been told you have a "chronic sprain" that isn't getting better
- You have pain behind the fibula that worsens with activity
- You've had an MRI showing a peroneal tendon tear or tenosynovitis
- You've had previous ankle surgery that didn't resolve your symptoms
If you're in the McKinney or Flower Mound, Texas area and dealing with any of these issues, I'd be happy to evaluate you. Peroneal tendon disorders are one of my areas of particular expertise, and getting the right diagnosis is the first step toward getting better.
Related guides you may find helpful:
Peroneal Tendon Article — Author Closing Section
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About the Author
Dr. Sarang Desai is a fellowship-trained orthopedic foot and ankle surgeon with a particular expertise in sports medicine. With over 15 years of experience, Dr. Desai serves as a professional sports team physician and treats the full spectrum of foot and ankle conditions — from ankle sprains and tendon injuries to complex reconstruction and revision surgery. He practices in McKinney and Flower Mound, Texas, serving patients throughout the Dallas-Fort Worth metroplex.
If you're dealing with lateral ankle pain that won't go away, a snapping ankle, or a peroneal tendon problem that's been missed — Dr. Desai would be happy to see you.
Schedule an appointment:
📞 (972) 547-0047
📍 McKinney & Flower Mound, Texas
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