Equinus Contracture: Gastrocnemius Recession vs. Percutaneous Achilles Lengthening — Selection and Outcomes

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

Equinus contracture — reduced ankle dorsiflexion from tightness of the gastrocnemius (isolated contracture) or the gastrocnemius-soleus complex (combined contracture) — is one of the most clinically significant biomechanical abnormalities in foot and ankle medicine, acting as an underlying driver of plantar fasciitis, metatarsalgia, diabetic plantar forefoot ulcers, Charcot arthropathy progression, and adult-acquired flatfoot. Distinguishing isolated gastrocnemius contracture (Silfverskiöld test positive — dorsiflexion deficit resolves with knee flexion) from combined gastrosoleus contracture (deficit persists with knee flexion) is essential for selecting the appropriate surgical release procedure.

Anatomy, Assessment, and Pathomechanics

Ankle dorsiflexion requirements for normal gait: 10° of ankle dorsiflexion is required during mid-stance and terminal stance; 15–20° for normal stair climbing and squatting; equinus (dorsiflexion <5° with knee extended) compensates by subtalar pronation, midfoot break, and early heel rise — creating the ‘equinus cascade’ of foot deformities. Silfverskiöld test: ankle dorsiflexion measured with knee extended (gastrocnemius and soleus tight) and knee flexed (relaxes gastrocnemius, isolates soleus); dorsiflexion deficit with knee extended that resolves (improves ≥10°) with knee flexion = isolated gastrocnemius contracture — Silfverskiöld positive. Deficit persisting with knee flexed = combined contracture. Clinical significance of equinus: contributes to plantar fasciitis (restricted dorsiflexion loads the plantar fascia); metatarsalgia (equinus shifts load onto the metatarsal heads); diabetic plantar forefoot ulcers (elevated peak plantar pressure from equinus); Charcot progression (ongoing plantar loading with insensate neuropathic foot). Conservative management: serial casting for spastic equinus; gastrocnemius stretching program (knee-extended Achilles stretch — 3 × 30 seconds × 3×/day); night splinting; custom orthotics with heel lift to accommodate contracture temporarily.

Surgical Release Options

Proximal medial gastrocnemius recession (Strayer procedure): the most commonly performed procedure for isolated gastrocnemius contracture — transection of the medial (and lateral if needed) gastrocnemius aponeurosis at the musculotendinous junction just distal to the medial knee; approach: medial leg incision at the musculotendinous junction; releases the gastrocnemius fascial restriction without cutting the soleus; gains 10–15° additional dorsiflexion; preserves ankle plantarflexion strength (soleus intact); low complication rate (sural nerve injury 2–3%); appropriate for Silfverskiöld positive patients. Percutaneous (Hoke) Achilles tendon lengthening: indicated for combined gastrosoleus contracture when Silfverskiöld test is negative — three stab incisions along the Achilles tendon with a tenotome; Z-lengthening of the entire Achilles allows 10–15° additional dorsiflexion; risk of over-lengthening producing calcaneal gait (loss of push-off strength); appropriate for diabetic equinus correction when combined contracture is present. Dr. Biernacki at Balance Foot & Ankle assesses equinus contracture with the Silfverskiöld test and performs gastrocnemius recession and Achilles lengthening at our Bloomfield Hills and Howell offices. Call (810) 206-1402.

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Frequently Asked Questions

When should I see a podiatrist?

See a podiatrist for any foot or ankle pain that persists more than 2 weeks, doesn’t improve with rest, limits your daily activities, or is accompanied by swelling, numbness, or skin changes. People with diabetes or circulation problems should see a podiatrist regularly even without symptoms.

What does a podiatrist treat?

Podiatrists diagnose and treat all conditions of the foot, ankle, and lower leg including plantar fasciitis, bunions, hammertoes, toenail problems, heel pain, nerve pain, diabetic foot care, sports injuries, fractures, and foot deformities — both surgically and non-surgically.

What can I expect at my first podiatry visit?

Your first visit includes a full medical history, physical examination of your feet and gait, and in-office diagnostic imaging if needed (X-rays, ultrasound). We’ll discuss your diagnosis and create a personalized treatment plan. Most visits take 30–45 minutes.

Need Treatment at Balance Foot & Ankle?

Dr. Tom Biernacki, Dr. Carl Jay, and Dr. Daria Gutkin see patients at our Howell and Bloomfield Township offices.

Book Online or call (810) 206-1402

Equinus Contracture Treatment in Michigan

Balance Foot & Ankle treats equinus contracture (tight calf muscles) with stretching protocols, night splints, and surgical lengthening when needed. Equinus contributes to plantar fasciitis, bunions, and diabetic ulcers.

Learn About Our Heel & Ankle Treatments → | Book Your Appointment | Call (810) 206-1402

Clinical References

1. DiGiovanni CW, et al. Isolated gastrocnemius tightness. J Bone Joint Surg Am. 2002;84(6):962-970.
2. Maskill JD, et al. Gastrocnemius recession to treat isolated foot pain. Foot Ankle Int. 2010;31(1):19-23.
3. Chimera NJ, et al. Effects of gastrocnemius recession on foot loading in patients with ankle equinus contracture. Foot Ankle Int. 2012;33(4):291-297.