Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Hills, MI. Last updated April 2026.
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Medically Reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatrist, Balance Foot & Ankle Specialists, Michigan. Last updated April 2026.
Understanding Peroneal Tendon Tears
The peroneal tendons — the peroneus longus and peroneus brevis — run behind the lateral malleolus (the fibular tip) in a fibro-osseous groove and are the primary evertors of the foot, essential for lateral ankle stability. Of the two tendons, the peroneus brevis is far more commonly torn, typically developing a longitudinal split tear in which the tendon splits along its length rather than rupturing transversely. This injury pattern occurs because the brevis tendon is compressed against the posterior fibula by the peroneus longus tendon, and a shallow fibular groove or superior peroneal retinaculum injury allows the tendons to rub against the fibular edge under repetitive load.
Causes and Risk Factors
Peroneus brevis tears develop through two primary mechanisms. Acute tears occur during ankle inversion sprains that force the peroneal tendons against the fibula under maximum eccentric load — the same mechanism that causes lateral ankle ligament sprains. Chronic tears develop gradually in patients with repetitive ankle instability, a shallow fibular groove, or anatomic variants that create abnormal tendon loading. Athletes in cutting and pivoting sports, runners with chronic ankle instability, and patients with cavovarus (high-arch) foot type have elevated peroneal tendon tear risk.
Symptoms and Diagnosis
Peroneal tendon tears present as persistent lateral ankle pain — specifically at and posterior to the fibular tip — that is exacerbated by eversion against resistance and by activities that load the ankle laterally. Patients often report a history of ankle sprain that did not heal as expected. Swelling and tenderness along the peroneal tendon sheath are present on examination. Peroneal tendon tear is distinguished from ankle ligament sprain by the location of tenderness — posterior to the fibular tip rather than anterior (where ligament tears are tender).
MRI is the gold-standard imaging study for peroneal tendon tears, visualizing the intratendinous split, fluid in the tendon sheath, and associated findings including peroneus brevis muscle herniation or longitudinal split. Dynamic ultrasound provides excellent real-time assessment of tendon morphology and can identify tears missed on MRI in experienced hands.
Surgical Treatment
Surgical Approach
Peroneal tendon repair is performed through a longitudinal incision behind the fibula under general or regional anesthesia. The superior peroneal retinaculum is incised to access the tendon sheath. Both peroneal tendons are inspected systematically from their musculotendinous junction to their distal insertions.
Tubularization of Brevis Tear
For tears involving less than 50 percent of the tendon cross-section, the split edges are debrided to healthy tissue and then sutured together in a tubularization technique — running sutures along the split close the tendon into a tubular configuration, restoring tendon continuity and mechanical integrity. This tendon-preserving technique is preferable when adequate healthy tendon tissue remains.
Tenodesis for Extensive Tears
When more than 50 percent of the peroneus brevis is damaged or the tendon is severely degenerated beyond reliable repair, tenodesis to the peroneus longus is performed. The brevis is cut proximally and distally at the diseased segment, and the proximal stump is sutured to the adjacent peroneus longus. The peroneus longus then carries the function of both tendons, providing continued lateral ankle eversion strength. Longus tenodesis has excellent functional outcomes as the longus tendon is robust and typically uninvolved in isolated brevis tears.
Groove Deepening and Retinaculum Repair
If the fibular groove is shallow — a contributing factor to chronic tendon irritation — a groove-deepening procedure is performed through the same incision. The posterior fibular cortex is thinned and shaped to create a deeper channel for the tendons. The superior peroneal retinaculum is repaired or reconstructed after tendon work is complete, restoring the anatomic restraint that keeps the tendons in the groove.
Concurrent Lateral Ligament Repair
Peroneal tendon tears frequently coexist with lateral ankle ligament insufficiency (ATFL and CFL tears). When both pathologies are present, combined peroneal tendon repair and lateral ligament reconstruction (Brostrom procedure) address both causes of lateral ankle pain and instability in a single surgery.
Recovery and Return to Activity
Non-weight-bearing in a posterior splint is maintained for two weeks postoperatively. Transition to a controlled ankle motion boot with progressive weight-bearing follows at weeks two through six. Physical therapy begins at six weeks with range of motion and peroneal strengthening. Athletes typically return to sport-specific training at four to six months. Long-term outcomes for peroneal tendon repair are favorable, with most patients achieving full lateral ankle stability and return to previous activity levels.
Evaluation for Lateral Ankle Pain
If you have chronic lateral ankle pain, particularly following one or more ankle sprains, peroneal tendon pathology may be contributing to your symptoms. Contact Balance Foot & Ankle for comprehensive evaluation including clinical examination, imaging review, and surgical consultation if appropriate.
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Expert Peroneal Tendon Repair in Michigan
Peroneal tendon tears require precise surgical evaluation to restore ankle stability and function. Dr. Tom Biernacki performs advanced peroneal tendon repair procedures at Balance Foot & Ankle, using both conservative and surgical approaches tailored to your tear severity.
Learn About Our Surgical Options | Book Your Appointment | Call (810) 206-1402
Clinical References
- Dombek MF, et al. “Peroneal tendon tears: a retrospective review.” J Foot Ankle Surg. 2003;42(5):250-258.
- Redfern D, Myerson M. “The management of concomitant tears of the peroneus longus and brevis tendons.” Foot Ankle Int. 2004;25(10):695-707.
- Heckman DS, et al. “Tendon disorders of the foot and ankle, part 2: peroneal tendon disorders.” Am J Sports Med. 2009;37(6):1210-1217.
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Book Your AppointmentWatch Dr. Tom on Peroneal Tendon Tear
Dr. Tom walks through peroneus brevis and longus tear diagnosis, conservative vs surgical decision-making, and recovery expectations.
Peroneal Tendon Tear Recovery Kit
Whether you choose conservative care or surgical repair, these four items support recovery of the lateral ankle:
Lace-Up Ankle Brace
Stabilizes the lateral ankle during conservative healing — prevents re-injury during the 8–12 week healing window.
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Offloads the repair site weeks 0–6 — required after surgical peroneal tendon repair.
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Topical relief for deep ankle pain during tendon healing — safer than daily oral NSAIDs that slow tendon repair.
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Controls subtalar position — reduces load on healing peroneal tendons during return to activity.
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Post-repair immobilization
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☎ (810) 206-1402Book Online →Differential Diagnosis: What Else Could It Be?
Not every case of peroneal tendonitis is straightforward. In our clinic we routinely rule out three look-alike conditions before confirming the diagnosis. If your symptoms don’t match the classic presentation, one of these may explain the pain — which is why physical exam matters more than self-diagnosis.
| Condition | How It Differs |
|---|---|
| Lateral ankle sprain | Acute inversion mechanism, bruising along anterior talofibular ligament, pain with anterior drawer. |
| 5th metatarsal base stress fracture | Point tenderness at 5th metatarsal base, pain with weight-bearing, fracture line on imaging. |
| Sinus tarsi syndrome | Deep ache in the sinus tarsi, pain reproduced with lateral palpation just anterior to the lateral malleolus. |
Red Flags — When to See a Podiatrist Now
Seek same-day evaluation at Balance Foot & Ankle if you notice any of the following:
- Snapping or popping behind the lateral malleolus (subluxation)
- Inability to evert the foot actively
- Persistent lateral ankle swelling >4 weeks
- Sudden pop with inability to continue walking
Call (810) 206-1402 or request an appointment. Our Howell and Bloomfield Hills offices reserve same-day slots for urgent foot and ankle issues.
In Our Clinic: What We See
Clinical perspective from Dr. Tom Biernacki, DPM — Balance Foot & Ankle, Howell & Bloomfield Hills, MI:
In our clinic, peroneal tendonitis patients usually come in after a recent ankle sprain — the pain started as a “sprain that didn’t fully heal.” They report lateral ankle pain that’s worse with turning the foot outward or walking on uneven surfaces. On exam we palpate specifically along the peroneal tendons behind the fibula and resist eversion. If we feel or see snapping behind the lateral malleolus, that’s peroneal subluxation, which usually needs surgical repair. Isolated peroneal tendonitis responds well to ankle bracing, peroneal eccentric strengthening, and temporary activity modification.
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.
- Diagnosis and Treatment of Plantar Fasciitis (PubMed / AAFP)
- Heel Pain (APMA)
- Hallux Valgus (Bunions): Evaluation and Management (PubMed)
- Bunions (Mayo Clinic)