✅ Medically reviewed by Dr. Tom Biernacki, DPM — Board-certified podiatrist specializing in foot & ankle surgery. View credentials.
What Are the Peroneal Tendons and Why Do They Tear? For specialized treatment, see our peroneal tendon care at Balance Foot & Ankle.
The peroneal tendons are two tendons—the peroneus brevis and peroneus longus—that run along the outer (lateral) side of the ankle, passing behind the lateral malleolus (the bony prominence on the outside of the ankle) through a fibro-osseous groove. These tendons evert the foot (turn it outward) and are critical stabilizers of the lateral ankle. Their position behind the lateral malleolus makes them vulnerable to injury during the same ankle inversion sprains that tear the lateral ankle ligaments.
Peroneal tendon pathology is common but frequently overlooked after ankle sprains. Studies using MRI show peroneal tendon tears in 25–77% of patients with chronic lateral ankle instability. The peroneus brevis tendon—which inserts at the base of the 5th metatarsal—is more commonly injured, often developing a longitudinal split tear at the level of the lateral malleolus. The peroneus longus is more vulnerable at the cuboid tunnel on the lateral midfoot, where it turns and crosses under the foot.
Types of Peroneal Tendon Injuries
Peroneal Tendinopathy
Tendinopathy (degenerative tendon disease without complete tear) produces chronic lateral ankle and outer foot pain, tenderness along the tendon course, and pain with activity. It is more common in runners and high-mileage athletes. On MRI, tendinopathy appears as tendon thickening and increased signal without complete disruption of tendon fibers.
Longitudinal Split Tears
The most common peroneal tendon tear pattern—longitudinal splitting of the peroneus brevis as it wraps around the posterior fibula. The tendon splits into two or more strands, producing chronic lateral ankle pain, swelling, and weakness. These tears develop acutely during an ankle sprain or gradually from chronic friction against the sharp posterior edge of the fibula. They are frequently missed on initial evaluation and discovered only when lateral ankle pain fails to resolve with standard sprain treatment.
Peroneal Tendon Subluxation and Dislocation
The peroneal tendons are normally held behind the lateral malleolus by the superior peroneal retinaculum (SPR). An acute forced dorsiflexion-eversion injury can tear the SPR, allowing the tendons to dislocate forward over the lateral malleolus—producing a painful snapping sensation on the outer ankle. Peroneal subluxation is sometimes mistaken for an ankle sprain, but the characteristic “snapping” over the lateral malleolus and the mechanism of forced dorsiflexion (rather than inversion) distinguish it. Athletes with peroneal subluxation typically require surgical repair of the retinaculum for return to sport.
Symptoms and Diagnosis
Symptoms of peroneal tendon tears include: persistent lateral ankle and outer foot pain (along the tendon path from behind the lateral malleolus to the base of the 5th metatarsal or across the lateral midfoot), swelling along the posterior fibula or lateral ankle, pain with eversion against resistance (the peroneal tendon stress test), and weakness with eversion. A “snapping” sensation with ankle movement suggests subluxation or dislocation.
MRI is the diagnostic standard and should be obtained when lateral ankle pain persists beyond 6–8 weeks despite appropriate treatment. MRI characterizes tear type, size, and location and guides surgical planning. Ultrasound in experienced hands can identify peroneal pathology with good sensitivity. Weight-bearing X-rays rule out bony avulsion fractures (5th metatarsal base avulsion—a common associated injury) and assess ankle alignment.
Treatment
Conservative Treatment
Tendinopathy and partial tears without instability are treated conservatively first: activity modification, immobilization in a boot for 4–6 weeks for acute symptoms, physical therapy emphasizing eccentric peroneal strengthening and proprioception, and lateral ankle bracing for ongoing support. Custom orthotics with lateral posting and arch support reduce peroneal tendon loading. Corticosteroid injection around (not into) the tendon reduces inflammation in selected cases. Conservative treatment succeeds in many patients with tendinopathy and partial tears, particularly when symptoms are of shorter duration.
Surgical Treatment
Surgery is indicated for: complete peroneal tendon ruptures, large longitudinal split tears failing conservative treatment, peroneal subluxation/dislocation, and tears associated with lateral ankle instability that requires concurrent ligament reconstruction. The appropriate surgical procedure depends on the tear type: debridement and tubularization (repair) for split tears with adequate tendon substance remaining, tenodesis (connecting the two peroneal tendons together) when one is too damaged to repair, allograft reconstruction for very large or irreparable tears, and superior peroneal retinaculum repair for subluxation.
Recovery from peroneal tendon surgery requires 6–12 weeks of non-weight-bearing or protected weight-bearing, followed by progressive rehabilitation over 3–6 months. Return to sport typically occurs at 4–6 months for debridement procedures and 6–9 months for tenodesis or reconstruction. Concurrent ligament reconstruction extends recovery timelines.
Frequently Asked Questions
How do I know if I tore my peroneal tendon vs. just sprained my ankle?
The distinction is difficult without imaging because the mechanism (ankle inversion) and the location of pain (lateral ankle) overlap significantly. Features suggesting peroneal tendon injury rather than isolated ligament sprain include: pain along the posterior fibula or running along the outer edge of the foot (not just at the lateral ligament attachment in front of the malleolus), tenderness directly over the peroneal tendons behind the lateral malleolus, weakness with eversion against resistance, and a snapping sensation with ankle movement. The most reliable way to diagnose peroneal tendon tears is MRI. Any patient with lateral ankle pain persisting beyond 6–8 weeks of appropriate sprain treatment should have MRI evaluation to assess for tendon pathology.
Can a peroneal tendon tear heal without surgery?
Partial tears and tendinopathy have a reasonable chance of resolving with conservative treatment—particularly immobilization followed by structured rehabilitation and orthotic support. Small longitudinal split tears in the peroneus brevis can sometimes stabilize and become asymptomatic with conservative management. However, large split tears, complete ruptures, and peroneal subluxation/dislocation rarely heal satisfactorily without surgical intervention. The deciding factors are tear size and type (on MRI), symptom severity, and functional demands. Athletes with peroneal subluxation almost universally require surgical retinaculum repair for reliable return to sport.
What is the difference between a 5th metatarsal fracture and a peroneal tendon tear?
A 5th metatarsal avulsion fracture—where the peroneus brevis pulls off a fragment of bone at its insertion on the base of the 5th metatarsal—is actually a type of peroneal tendon injury (avulsion), and it is the most common fracture associated with ankle sprains. It presents with point tenderness at the base of the 5th metatarsal (the bony prominence at the outer midfoot). It is diagnosed on X-ray. Most 5th metatarsal avulsion fractures heal with 4–6 weeks of protected weight-bearing in a boot, without surgery. Peroneal tendon tears (at the tendon substance, not the insertion) are soft-tissue injuries diagnosed on MRI, not X-ray. A podiatrist evaluates both after lateral ankle injury.
Medical References & Sources
- PubMed Research — Peroneal Tendon Tear Studies
- American Orthopaedic Foot & Ankle Society — Peroneal Tendon Injuries
- PubMed Research — Peroneal Subluxation Repair
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Dr. Tom Biernacki, DPM is a board-certified podiatric surgeon at Balance Foot & Ankle in Howell and Bloomfield Hills, Michigan. He evaluates and treats peroneal tendon injuries with MRI-guided management, orthotic therapy, and surgical repair and reconstruction when indicated.
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Our board-certified podiatrists treat this condition at two convenient locations. Same-day appointments often available.
Medically Reviewed by: Dr. Tom Biernacki, DPM — Board-Certified Podiatrist, Balance Foot & Ankle Specialists
Peroneal Tendon Tear — Comprehensive Treatment Options
Peroneal tendon tears cause lateral ankle pain and instability. Our surgeons offer repair, debridement, and reconstruction to restore full function and prevent chronic problems.
Clinical References
- Dombek MF et al. Peroneal tendon tears: a retrospective review. J Foot Ankle Surg. 2003;42(5):250-258.
- Heckman DS et al. Tendon disorders of the foot and ankle, part 2: peroneal tendon disorders. Am J Sports Med. 2009;37(6):1175-1184.
- Redfern D, Myerson M. The management of concomitant tears of the peroneus longus and brevis tendons. Foot Ankle Int. 2004;25(10):695-707.
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Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.
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