Muscular strength after callotasis limb lengthening

Area of Science:

• Orthopedic surgery
• Pediatric orthopedics
• Biomechanical analysis

Background:

• Congenital short femur presents a significant orthopedic challenge in children.
• Limb lengthening procedures aim to correct discrepancies but functional outcomes require thorough evaluation.

Purpose of the Study:

• To assess the long-term functional recovery of knee extensor muscle strength after collotasis lengthening for congenital short femur.
• To investigate the correlation between limb size increase and muscle strength development.

Main Methods:

• Isometric voluntary contraction strength testing of knee extensors in seven pediatric patients.
• Measurements taken pre-surgery and at 6-month intervals for two years post-fixator removal.
• Strength data standardized using anthropometric estimates of thigh muscle and bone cross-sectional areas.

Main Results:

• The lengthened limb consistently demonstrated lower knee extensor strength compared to the contralateral normal limb, even after standardization.
• A positive correlation was observed between the increase in limb size and the increase in muscle strength in both limbs.
• Despite achieving leg length equalization, functional deficits in the lengthened limb persisted for the study duration.

Conclusions:

• Collotasis lengthening effectively increases limb size in congenital short femur but does not fully normalize knee extensor muscle strength within two years.
• Functional impairment of the lengthened limb suggests that muscle recovery lags behind skeletal lengthening.
• Further research is needed to optimize rehabilitation strategies and improve functional outcomes after pediatric limb lengthening.