When years of stretching, bracing, and Botox stop keeping pace with growth, orthopedic surgery is often the next step. This article explains when tendon and muscle lengthening is considered, what Single-Event Multi-Level Surgery looks like, what recovery involves, and what realistic outcomes look like.
Why Tendons and Muscles Get Tight in CP
Spasticity in CP means certain muscles fire continuously even at rest. Over years, the dominant muscle pulls on the joint constantly while the opposing muscle is rarely loaded. The dominant muscle physically shortens; the joint loses range of motion. Common patterns include tight calf muscles (causing toe-walking), tight hamstrings (causing crouch gait), tight hip adductors (scissoring), and tight elbow or wrist flexors. Conservative treatment slows this process but does not always stop it. When the contracture becomes fixed and is no longer correctable by stretching, surgical lengthening is the option that restores motion.
Conservative Treatment First
Surgeons typically want to see a track record of conservative care before recommending lengthening:
- Daily PT and home stretching
- Bracing (AFOs, knee immobilizers, hand splints)
- Botox injections every 4 to 6 months as appropriate
- Oral medications or ITB pump for severe spasticity
- Possibly serial casting
If function is maintained or improving, surgery is often deferred. When spasticity outpaces growth and contractures form, the math changes.
Years of orthopedic care, surgery, and rehab cost hundreds of thousands of dollars over a lifetime. A free legal review can clarify whether the underlying CP was preventable and what funding options exist.
What SEMLS Is and Why It Helps
Single-Event Multi-Level Surgery (SEMLS) is the modern standard for orthopedic management of CP. Instead of operating on one joint at a time across multiple childhood admissions, the surgeon plans a comprehensive set of releases and lengthenings to be done in one operation. A typical SEMLS may include calf muscle (gastrocnemius) lengthening, hamstring lengthening, hip adductor release, and bony correction (osteotomy) all together. The advantages: one anesthesia exposure, one rehabilitation period, better balance among the corrected joints, and more efficient recovery. Pre-operative gait analysis at a specialty CP center informs the exact plan.
What Surgery Day Looks Like
Surgery is performed under general anesthesia and typically takes 3 to 6 hours depending on how many sites are addressed. Most procedures are minimally invasive: small incisions over the tendon, careful release or Z-plasty lengthening, then closure. Bony corrections (osteotomies) involve cutting and reshaping the bone, then fixing with plates or screws. Hospital stay ranges from 2 to 7 days. Casts are applied during surgery and typically stay on for 4 to 6 weeks. Pain is managed with regional blocks, scheduled pain medication, and muscle relaxants.
Recovery and Rehabilitation
The first 6 weeks: cast or post-op brace immobilization, gentle range of motion as cleared, family training on positioning and care. Week 6 to 12: cast removal, transition to standing and weight-bearing, beginning of intensive PT. Months 3 to 12: 4 to 5 PT sessions per week to retrain walking patterns, strengthen now-elongated muscles, and refit bracing. Many families describe rehab as harder than the surgery: it is when functional gains are made or lost. Most kids return to school within 4 to 8 weeks, though they may need a wheelchair temporarily and adapted PE.
What Outcomes Look Like
For well-selected children with appropriate SEMLS and intensive rehab, gains can include: better walking endurance, improved gait quality (less crouch, less toe-walk), reduced pain, easier seating and care for non-walkers, and slowed progression of joint deformities. Outcomes are individual and depend on the underlying CP severity, age at surgery, surgical plan, rehab intensity, and family commitment. Some children walk meaningfully better after SEMLS; others gain comfort and care benefits without major mobility change. Realistic expectations and pre-operative goal-setting matter enormously.
Steps to Plan Tendon/Muscle Lengthening Surgery
A working list as your team discusses surgery.
How long do the gains last?
Many improvements last for years if the underlying spasticity is managed and the child does not outgrow the correction. Some children need follow-up procedures during adolescent growth spurts. Children who continue PT, bracing, and spasticity management generally hold gains longer.
Will my child walk after surgery if they could not before?
Surgery cannot create motor control that the brain does not have. Children who already have some walking ability often walk better; children who do not walk usually do not gain walking from lengthening alone. Realistic goal-setting before surgery is essential.
We help families across 38 states identify CP-specialty orthopedic centers and navigate insurance for SEMLS.
Related reading for parents
- Selective Dorsal Rhizotomy (SDR) for cerebral palsy: is your child a candidate?
- Intrathecal baclofen pump for severe spasticity: a parent’s complete guide
- Botox injections for spasticity in children with CP
- Hip reconstruction surgery for CP-related hip dislocation
- Spasticity in cerebral palsy: causes, effects, and treatment
Our team helps families in 38 states understand the full clinical picture and what services should be in place. No cost. Answers first.
