Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Hills, MI. Last updated April 2026.

Peroneal Tendon Tears — The Misdiagnosed Lateral Ankle Condition

Peroneal tendon tears — longitudinal splitting of the peroneus brevis or peroneus longus tendons — are among the most common causes of chronic lateral ankle pain that fails to resolve after a “sprain” is treated conservatively. The peroneal tendons (peroneus brevis and peroneus longus) pass posterior to the lateral malleolus in a shared fibro-osseous groove; they are the primary evertors of the foot and function as the dynamic lateral ankle stabilizers. Peroneal tendon tears present with: lateral ankle pain posterior to the lateral malleolus (not anterior, as in the lateral ligament complex); pain with forced inversion or resisted eversion; swelling posterior to the lateral malleolus; and often, a history of a significant inversion ankle sprain that “never fully healed.” The reason they’re missed: lateral ankle X-rays are negative; MRI is required but is often not ordered when the clinical impression is a resolving sprain. At Balance Foot & Ankle in Howell and Bloomfield Hills, Michigan, Dr. Tom Biernacki, DPM identifies peroneal pathology with clinical examination and in-office diagnostic ultrasound. Call (810) 206-1402.

Peroneus Brevis vs. Peroneus Longus Tears — Different Presentations

Peroneus brevis tears are more common — the peroneus brevis occupies the more constrained position in the retromalleolar groove and is compressed against the posterior fibula during inversion injuries. Peroneus brevis tears are longitudinal splits (the tendon splits into two longitudinal fragments along its course), causing posterior malleolar pain that worsens with eversion against resistance. Peroneus longus tears are less common but more clinically significant — the peroneus longus crosses the cuboid tunnel at the lateral midfoot and can rupture at the os peroneum (a sesamoid bone in the PL tendon at the cuboid). Peroneus longus tear or os peroneum fracture presents with lateral midfoot and cuboid tunnel pain — a different location than brevis tears. MRI differentiates the two: brevis tears show longitudinal intrasubstance signal at the retromalleolar groove; longus tears show signal at the cuboid tunnel with possible os peroneum displacement.

Conservative Management — Partial Thickness Tears

Partial peroneal tendon tears (less than 50% cross-sectional area involvement on MRI) are managed conservatively: cam boot immobilization for 4–6 weeks to allow tendon healing and pain resolution; physical therapy focusing on peroneal strengthening and proprioception after immobilization; a lateral heel wedge orthotic that limits rearfoot inversion and reduces peroneal tendon tensile load during walking; and a lace-up ankle brace for return to sport activities. Conservative success rate: 60–70% of partial tears respond to 3 months of conservative management without requiring surgery. Predictors of conservative failure: tear greater than 50% cross-sectional area; concurrent peroneal subluxation; cavovarus foot alignment (high arch, heel varus — increases peroneal load); and prior failed conservative management.

Surgical Management — Debridement, Tubularization, and Reconstruction

Peroneal tendon tears that fail conservative management require surgery: partial-thickness tears — debridement of the torn edges and tubularization (suturing the split edges together to restore a round tendon cross-section); complete tears of the peroneus brevis — tenodesis to the peroneus longus (the intact longus assumes the brevis function); complete tears of both peroneals — allograft reconstruction or free tendon graft; and concurrent superior peroneal retinaculum repair if subluxation was a contributing factor. Groove deepening procedure is added if the retromalleolar groove is shallow. Recovery: non-weight-bearing 4–6 weeks, progressive weight-bearing in boot 6–8 weeks, return to sport 4–6 months. Outcomes: 85–90% good-to-excellent outcomes with surgical intervention in appropriately selected patients.

Peroneal Tendon Evaluation in Howell & Bloomfield Hills Michigan

Dr. Tom Biernacki, DPM performs in-office diagnostic ultrasound for real-time peroneal tendon evaluation, identifies partial tears and subluxation at the point of care, and coordinates MRI for pre-surgical planning at Balance Foot & Ankle. Any patient with chronic lateral ankle pain after a “sprain” that hasn’t resolved in 6–8 weeks deserves peroneal tendon evaluation. Serving Howell, Brighton, Saginaw, Bloomfield Hills, Auburn Hills, and all Southeast Michigan. Book your evaluation or call (810) 206-1402.

Peroneal Tendon Injury Treatment in Michigan

Peroneal tendon tears and splits cause chronic lateral ankle pain that’s often misdiagnosed as ankle sprains. Our podiatrists use ultrasound and MRI to accurately diagnose peroneal tendon disorders and provide targeted surgical and non-surgical treatment.

Learn About Our Peroneal Tendon Treatments → | Book Your Appointment | Call (810) 206-1402

Clinical References

1. Dombek MF, et al. Peroneal tendon tears: a retrospective review. J Foot Ankle Surg. 2003;42(5):250-258.
2. Redfern D, Myerson M. The management of concomitant tears of the peroneus longus and brevis tendons. Foot Ankle Int. 2004;25(10):695-707.
3. Heckman DS, et al. Tendon disorders of the foot and ankle, Part 2: Achilles tendon disorders. Am J Sports Med. 2009;37(6):1223-1234.

Your Board-Certified Podiatrists

Dr. Tom Biernacki, DPM

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Dr. Tom Biernacki, DPM

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.