Medically Reviewed by Dr. Jeffery Agnoli, DPM — Board-Certified Podiatrist, Balance Foot & Ankle Specialists, Michigan. Last updated April 2026.
Foot and Ankle Tendons: The Moving Parts That Fail
The foot and ankle depend on a complex network of tendons — the cable-like structures connecting muscles to bones — to produce and control movement. Understanding which tendons are injured in specific clinical presentations directs appropriate diagnosis and treatment. At Balance Foot and Ankle in Howell and Bloomfield Township, Michigan, we evaluate and treat the full spectrum of foot and ankle tendon pathology.
Achilles Tendon
The Achilles — the largest and strongest tendon in the body — connects the gastrocnemius and soleus calf muscles to the calcaneus. It is subject to two distinct injury patterns: mid-substance tendinopathy (pain 2-6 cm above the heel insertion, from repetitive overload) and insertional tendinopathy (pain directly at the heel bone attachment, often with Haglund’s spur). Both respond to eccentric loading exercise programs. Complete Achilles rupture — an acute, often painless pop with complete loss of plantarflexion power — requires surgical or conservative management with extended immobilization.
Posterior Tibial Tendon
The posterior tibial tendon is the primary dynamic arch support and most commonly injured through progressive overuse in the middle-aged and older population, particularly women. Tendinopathy causes inner ankle pain and progressive arch collapse — left untreated, PTTD advances to flexible then rigid flatfoot requiring complex surgical reconstruction. Early orthotic support and strengthening exercises arrest progression.
Peroneal Tendons
The peroneal longus and brevis tendons run behind the lateral malleolus and evert the foot. They are injured in ankle sprains, from repetitive inversion stress, and from anatomic anomalies (a shallow fibular groove that allows tendon subluxation — snapping sensation at the outer ankle). Longitudinal splits in the peroneal brevis are common in athletes with chronic ankle instability. Surgical repair addresses persistent tendon tears and subluxation.
Flexor Hallucis Longus
The FHL runs through a fibrous tunnel behind the medial ankle and under the arch to insert on the base of the great toe. It is the “push-off” tendon for the great toe — essential for running and ballet. Tendinopathy causes posterior ankle or arch pain with great toe flexion and is particularly common in dancers. Tenosynovitis and nodule formation can cause triggering (stenosing tenosynovitis of the great toe).
Extensor Tendons
The extensor digitorum longus and extensor hallucis longus run across the top of the foot. They are more commonly injured by direct trauma (lacerations, contusions) than by overuse. Extensor tendinitis from tight shoelaces or footwear pressing on the dorsum of the foot is treated by footwear modification and anti-inflammatory measures.
When Tendons Need Surgery
Tendon surgery is indicated for complete ruptures requiring repair, longitudinal tears causing persistent pain despite conservative care, tendon subluxation, and chronic tendinopathy with failed conservative management. Contact Balance Foot and Ankle at (810) 206-1402 for evaluation of any tendon injury — early diagnosis and appropriate treatment prevents progression to conditions requiring surgical intervention.
Foot or Ankle Pain? We Can Help.
Balance Foot & Ankle — Howell & Bloomfield Township, MI
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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.
- Diagnosis and Treatment of Plantar Fasciitis (PubMed / AAFP)
- Heel Pain (APMA)
- Hallux Valgus (Bunions): Evaluation and Management (PubMed)
- Bunions (Mayo Clinic)
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