Changes in gait velocity, mean knee flexion in stance, body mass index, and popliteal angle with age in ambulatory children with cerebral palsy.

Background: The purpose of this study was to explore changes in body mass index (BMI), gait velocity, mean knee flexion in stance, and popliteal angle with age in ambulatory children with cerebral palsy.

Methods: A cross-sectional sample of 188 ambulatory children with cerebral palsy Gross Motor Function Classification System II or III who had a motion analysis evaluation. Subjects had no previous surgical interventions and were between the ages of 4 and 21.