Limb lengthening in achondroplasia

Area of Science:

• Orthopedic surgery
• Pediatric orthopedics
• Limb reconstruction

Background:

• Stature lengthening for skeletal dysplasia is complex and lacks uniform global guidelines.
• Social and psychological factors drive demand for limb lengthening despite surgical risks.
• This study evaluates outcomes and complications of extensive limb lengthening at a single center.

Purpose of the Study:

• To describe the outcomes of extensive stature lengthening procedures.
• To analyze complications associated with limb lengthening in skeletal dysplasia.
• To assess the impact of age and bone segment on healing.

Main Methods:

• Nine patients (8 achondroplastic, 1 hypochondroplastic) underwent bilateral lengthening of tibiae, femora, and humeri.
• Ring fixators and monolateral systems were used with bifocal and unifocal corticotomies.
• Key metrics included length gain, healing index, and complication rates.

Main Results:

• Mean length gains were 15.4 cm (tibia), 9.9 cm (femur), and 9.6 cm (humerus).
• Average height gain was 33.3%, with significant height percentile achievement in some patients.
• 33 complications occurred (0.9 per segment); healing index was unaffected by age or bone segment.

Conclusions:

• Extensive limb lengthening, defined as >50% increase, is associated with significant risks.
• These procedures require thorough consideration due to potential complications.
• Outcomes suggest potential for substantial height gain but necessitate careful risk-benefit assessment.