Medically reviewed by Dr. Tom Biernacki, DPM — Board-certified foot & ankle surgeon, 3,000+ surgeries performed. Updated April 2026 with current clinical evidence. This article reflects real practice experience from Balance Foot & Ankle Specialists in Howell and Bloomfield Hills, Michigan.
Quick Answer
Most foot and ankle problems respond to conservative care — proper footwear, supportive inserts, activity modification, and targeted stretching — within 4-8 weeks. Persistent pain beyond that window, or any symptom that prevents walking, warrants a podiatric evaluation to rule out fracture, tendon tear, or systemic cause.
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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.
Sinus tarsi syndrome is a clinical entity characterized by persistent lateral hindfoot pain and instability localized to the sinus tarsi — the cone-shaped space between the calcaneus and talus containing fat, ligaments, and neurovascular structures. Despite being described for over 60 years, sinus tarsi syndrome remains underrecognized and frequently misattributed to chronic ankle sprain, subtalar instability, or simply “chronic ankle pain.”
Anatomy and Pathomechanics
The sinus tarsi is bounded by the posterior facet of the subtalar joint medially and contains the interosseous talocalcaneal ligament, cervical ligament, fat pad, and branches of the peroneal and posterior tibial nerves that provide proprioceptive information about subtalar position. Lateral ankle inversion injuries — the most common mechanism — can tear the cervical and interosseous ligaments, damage the fat pad, and disrupt the proprioceptive nerve supply, resulting in chronic post-traumatic synovitis, fibrosis, and disordered hindfoot kinematics. In patients without prior trauma, pes planus (excessive subtalar pronation) chronically impinges the structures within the sinus tarsi and may produce the syndrome in the absence of discrete ligamentous injury.
Clinical Diagnosis
The hallmark finding is point tenderness directly over the sinus tarsi — located approximately 1 cm anterior and inferior to the lateral malleolus on the anterolateral foot. Patients describe a constant dull ache with episodic sharp lateral pain during uneven terrain ambulation and report a sense of subtalar instability distinct from talocrural giving-way. The diagnostic test of choice is a sinus tarsi injection: infiltration of local anesthetic (1% lidocaine, 1mL) into the sinus tarsi — performed under fluoroscopic or ultrasound guidance — provides complete or near-complete temporary pain relief, confirming the diagnosis and distinguishing sinus tarsi syndrome from peroneal tendon pathology or calcaneocuboid joint pain.
Injection Technique
Under ultrasound guidance, the sinus tarsi is identified as the hyperechoic fat-filled space anterior to the posterior subtalar joint. A 25-gauge needle is advanced anterolaterally into the space, and correct positioning is confirmed by saline flush with observed fluid distension. A mixture of 1mL 1% lidocaine and 0.5mL betamethasone provides both diagnostic and therapeutic benefit. Repeat injections at 6–8 week intervals may provide sustained relief in inflammatory cases. MRI demonstrates sinus tarsi fat replacement with fluid or fibrotic tissue and ligamentous disruption in established cases.
Management Beyond Injection
Custom orthotics with medial rearfoot posting to limit subtalar pronation are effective for pes planus-associated cases. Physical therapy emphasizing subtalar proprioception re-education and peroneal strengthening addresses the dynamic instability component. Surgical arthroscopic debridement of the sinus tarsi with ligamentous repair or reconstruction is reserved for cases refractory to 6+ months of conservative care. Dr. Biernacki at Balance Foot & Ankle provides ultrasound-guided sinus tarsi injection and comprehensive management of posterior lateral foot pain. Call (810) 206-1402 for evaluation at our Bloomfield Hills or Howell office.
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Our board-certified podiatrists treat this condition at two convenient locations. Same-day appointments often available.
When to See a Podiatrist
Many foot conditions can be managed conservatively at home, but some require professional evaluation. See a podiatrist promptly if you experience:
- Pain that persists for more than 2 weeks despite rest
- Swelling, redness, or warmth that isn’t improving
- Numbness, tingling, or burning in the feet
- A wound or sore that is not healing within 2 weeks
- Any foot concern if you have diabetes or poor circulation
- Nail changes that suggest fungal infection or other problems
At Balance Foot & Ankle, our three board-certified podiatrists — Dr. Tom Biernacki, Dr. Carl Jay, and Dr. Daria Gutkin — provide comprehensive foot and ankle care at our Howell and Bloomfield Township offices. Most insurance plans are accepted.
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Sinus Tarsi Syndrome Treatment in Michigan
Sinus tarsi syndrome causes persistent lateral ankle pain often mistaken for chronic ankle sprains. Our podiatrists accurately diagnose this condition with targeted examination and imaging.
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Clinical References
- Klausner V, McKeigue ME. Sinus tarsi syndrome: a case report and review of the literature. J Foot Ankle Surg. 2000;39(2):120-124.
- Pisani G, Pisani PC, Parino E. Sinus tarsi syndrome and subtalar joint instability. Clin Podiatr Med Surg. 2005;22(1):63-77.
- Linklater J, Hayter CL, Vu D, Tse K. Anatomy of the subtalar joint and imaging of talo-calcaneal coalition. Skeletal Radiol. 2009;38(5):437-449.
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Howell Office
3980 E Grand River Ave, Suite 140
Howell, MI 48843
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Bloomfield Hills Office
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Bloomfield Hills, MI 48302
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Book Your AppointmentIn-Office Treatment at Balance Foot & Ankle
If home care isn’t resolving your your foot or ankle concern, a visit with a board-certified podiatrist is the fastest path to accurate diagnosis and a personalized plan. At Balance Foot & Ankle Specialists, Dr. Tom Biernacki, Dr. Carl Jay, and Dr. Daria Gutkin offer same-day and next-day appointments at both our Howell and Bloomfield Hills offices. We perform on-site diagnostic ultrasound, digital X-ray, conservative care, advanced regenerative treatments, and minimally invasive surgery when indicated.
Call (810) 206-1402 or request an appointment online. Most insurance plans accepted, including Medicare, Blue Cross Blue Shield, Aetna, Cigna, and United Healthcare.
Most Common Mistake We See
The most common mistake we see is: Waiting too long before seeking care. Fix: any foot pain lasting more than 4 weeks, or any sudden severe symptom, deserves a professional evaluation rather than more rest.
Warning Signs That Need Same-Day Care
Seek immediate evaluation at Balance Foot & Ankle if you experience any of the following:
- Unable to bear weight
- Severe swelling with skin colour change
- Fever with foot pain (possible infection)
- Diabetes plus any new foot symptom
Call (810) 206-1402 — same-day and next-day appointments at our Howell and Bloomfield Hills offices.
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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.
- Plantar Fasciitis: Diagnosis and Conservative Management (PubMed)
- Plantar Fasciitis (APMA)
- Diagnosis and Treatment of Plantar Fasciitis (PubMed / AAFP)
- Heel Pain (APMA)