Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle, Howell & Bloomfield Hills, MI
Last reviewed: May 2026
Most patients underestimate how much the post-operative phase determines Foot Tendon Lengthening : Achilles, Gastrocnemius, and Toe Flexors outcomes — not the surgery itself. Our podiatric surgeons identify the single recovery variable that separates patients who return to full activity on schedule from those who experience setbacks. Call (810) 206-1402 — expert podiatric care across Michigan.
Tendon lengthening surgery releases contractures that cause equinus deformity, toe curling, and dynamic imbalance. In the foot and ankle, the most common procedures target the gastrocnemius-soleus complex (equinus), the Achilles tendon (severe equinus), and the long toe flexors (flexible hammertoe and claw toe deformity). Each procedure has a specific level of contracture that makes it appropriate, and overlengthening carries risks more severe than the original deformity.
Tendon Lengthening Procedures: Indications and Technique Comparison
| Procedure | Tendon | Indication | Technique | Risk of Overlengthening |
|---|---|---|---|---|
| Gastrocnemius recession (Strayer / Baumann) | Gastrocnemius at musculotendinous junction | Isolated gastrocnemius equinus; plantar fasciitis recalcitrant to conservative care; Achilles insertional issues | Endoscopic or open release at MTJ; soleus preserved | Low — soleus maintains residual plantarflexion strength |
| Achilles tendon lengthening (TAL / Z-lengthening) | Achilles tendon proper | Severe spastic equinus (cerebral palsy, stroke); rigid equinus contracture over 15 degrees | Z-plasty (open) or percutaneous triple hemisection | Significant — overlengthening causes calcaneal gait (toe-up; heel-only walking); painful and disabling |
| FDL/FHL lengthening (toe flexors) | Flexor digitorum longus / flexor hallucis longus | Flexible hammertoe; claw toe; spastic toe curling | Tenotomy at digit or Z-lengthening at musculotendinous junction | Moderate — floppy toe if over-released; loss of grip |
| Posterior tibial tendon lengthening | Posterior tibialis | Spastic varus deformity; equinovarus in upper motor neuron conditions | Z-lengthening; fractional lengthening | Moderate-high — overcorrection causes flatfoot; valgus collapse |
Gastrocnemius Recession vs Achilles Lengthening: Key Decision Points
| Factor | Gastrocnemius Recession (Preferred When) | Achilles Lengthening (Required When) |
|---|---|---|
| Contracture with knee extended only | Yes — isolated gastrocnemius tightness | Rarely — assess Silfverskiold test first |
| Contracture with knee bent (Silfverskiold positive) | No — soleus involved; recession insufficient | Yes — both muscles involved; Achilles must be lengthened |
| Degree of equinus | Under 10 degrees deficit | Over 15 degrees; severe rigid equinus |
| Strength preservation priority | Yes — gastrocnemius recession preserves plantarflexion strength | No — TAL reduces plantarflexion 20-30% |
| Neurologic involvement | Preferred for athletes and non-spastic contracture | Standard for spastic equinus (CP, stroke, TBI) |
The Silfverskiold test is the critical preoperative assessment: dorsiflexion with the knee extended (gastrocnemius under tension) vs knee flexed (gastrocnemius relaxed). If equinus corrects with knee flexion, the gastrocnemius alone is tight and recession at the musculotendinous junction is appropriate. If equinus persists with knee flexed, the soleus is also contracted and Achilles lengthening is required.
At Balance Foot & Ankle in Howell and Bloomfield Hills, we perform Silfverskiold testing, equinus contracture grading, and gastrocnemius recession for patients with recalcitrant plantar fasciitis and equinus-driven foot conditions. Call (810) 206-1402.
American Academy of Orthopaedic Surgeons: Tendon Lengthening
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Doctor Answer
What is tendon lengthening surgery for the foot and when is it needed?
Tendon lengthening procedures release contracted tendons that are pulling the foot into a deformed position. The most common is Achilles/gastrocnemius lengthening for equinus contracture contributing to plantar fasciitis, flatfoot, or diabetic forefoot ulcers. Flexor tendon lengthening corrects claw toes and hammer toes. I use percutaneous or open techniques depending on the amount of lengthening required. Recovery ranges from immediate weight-bearing to several weeks in a cast depending on which tendon and technique is used.
Dr. Tom Biernacki, DPM is a board-certified foot & ankle surgeon (ABFAS & ABPM) 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 made him one of the most-followed foot & ankle educators on YouTube.