Sinus Tarsi Syndrome — Lateral Heel Pain After Ankle Sprain Michigan

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

What Is Sinus Tarsi Syndrome?

The sinus tarsi is a small bony tunnel on the outer side of the foot between the talus and calcaneus (heel bone), just anterior (in front of) the lateral malleolus. It contains fatty tissue, nerve endings, and ligaments that provide proprioceptive feedback about subtalar joint position. Sinus tarsi syndrome is a clinical entity characterized by persistent pain and tenderness localized to this area — typically following a lateral ankle sprain or in the context of chronic overpronation. The ligaments and fatty tissue within the sinus tarsi are compressed or torn during inversion injuries, leading to synovitis, fibrosis, and chronic pain. At Balance Foot & Ankle in Howell and Bloomfield Hills, Michigan, Dr. Tom Biernacki, DPM evaluates sinus tarsi syndrome. Call (810) 206-1402.

Causes and Why It’s Often Missed

Sinus tarsi syndrome is frequently misdiagnosed as a chronic ankle sprain — the lateral location mimics lateral ligament tenderness, and the history of a prior ankle sprain is shared. The key distinction: lateral ligament sprain (ATFL, CFL) tenderness is slightly more anterior and superior, over the ligament fibers; sinus tarsi tenderness is located in the indentation just anterior to the lateral malleolus, over the sinus tarsi opening. Sinus tarsi syndrome accounts for an estimated 70% of cases of “chronic ankle sprain” that do not fully resolve — the persistent subtalar synovitis and proprioceptive deficit cause ongoing pain and instability that is distinct from residual ligament laxity. It is most common in overpronating patients, where the calcaneus rolls inward and repeatedly compresses the sinus tarsi contents.

Diagnosis

Clinical diagnosis: exquisite point tenderness at the sinus tarsi opening that is reproduced with palpation; pain with subtalar eversion and inversion (not with dorsiflexion/plantarflexion, which distinguishes it from tibiotalar pathology); and relief with diagnostic local anesthetic injection into the sinus tarsi — both diagnostic and temporarily therapeutic. MRI demonstrates synovitis, fibrosis, and ligament disruption within the sinus tarsi — the posterior interosseous ligament, anterior interosseous ligament, and cervical ligament are the primary injured structures. Standard ankle X-ray is typically normal. Weight-bearing CT assesses concurrent subtalar joint arthritic changes.

Conservative Treatment

Conservative management of sinus tarsi syndrome: corticosteroid injection into the sinus tarsi — the most effective initial intervention, providing significant relief in 60–70% of patients for 3–6 months; custom orthotics with deep heel cup and valgus rearfoot posting that reduces inversion stress and subtalar compression, addressing the biomechanical driver in overpronating patients; a lace-up ankle brace providing lateral stability; physical therapy with peroneal strengthening and proprioceptive retraining to address the proprioceptive deficit; and activity modification during the acute phase. Repeat injection at 3–6 months if initial relief was significant but temporary. Most patients achieve adequate long-term control with a combination of orthotics and 1–2 injections per year.

Surgical Management — Arthroscopic Debridement

When conservative management fails after 6–12 months, arthroscopic debridement of the sinus tarsi removes the fibrotic and synovitic tissue causing chronic pain and inflammation. The procedure is performed through small arthroscopic portals. Outcomes: 75–85% patient satisfaction; significant reduction in sinus tarsi pain; and improved subtalar proprioception. If concurrent subtalar arthritis is identified arthroscopically, the treatment escalates to subtalar fusion for advanced cartilage loss. Recovery: 4–6 weeks in a walking boot after arthroscopic debridement, 3–4 months to full activity.

Sinus Tarsi Syndrome Management in Howell & Bloomfield Hills Michigan

Dr. Tom Biernacki, DPM provides sinus tarsi syndrome evaluation with in-office diagnostic ultrasound, clinical testing, and ultrasound-guided injection at Balance Foot & Ankle. Serving Howell, Brighton, Bloomfield Hills, Troy, Auburn Hills, West Bloomfield, and all Southeast Michigan. If your “ankle sprain” hasn’t fully healed at 3+ months, sinus tarsi syndrome should be evaluated. Book your evaluation or call (810) 206-1402.

Sinus Tarsi Syndrome Treatment in Michigan

Sinus tarsi syndrome causes persistent lateral heel and ankle pain after sprains that doesn’t improve with typical rest and rehab. Our podiatrists diagnose this underrecognized condition and provide targeted treatment to resolve chronic post-sprain pain.

Learn About Our Ankle Treatment Options → | Book Your Appointment | Call (810) 206-1402

Clinical References

1. Helgeson K. Examination and intervention for sinus tarsi syndrome. N Am J Sports Phys Ther. 2009;4(1):29-37.
2. Klausner MH, McKeigue ME. The sinus tarsi syndrome: a cause of chronic ankle pain. Phys Sportsmed. 2000;28(5):75-80.
3. Taillard W, et al. The sinus tarsi syndrome. Int Orthop. 1981;5(2):117-130.

Your Board-Certified Podiatrists

Dr. Tom Biernacki, DPM

Board-Certified · FACFAS

Dr. Carl Jay, DPM

Board-Certified Podiatrist

Dr. Daria Gutkin, DPM

Podiatrist

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.