Abstract
Children with CP frequently walk with excessive knee flexion in terminal swing and stance phase. Abnormally tight HS are thought to be one possible cause. A common treatment option for crouch gait is surgical lengthening of the hamstrings, usually in combination with other orthopaedic procedures (multi-level approach). Arnold et’al. [1] used a sophisticated musculo-skeletal model and a multicenter design to show that treating hamstrings which are short and lengthen at an inadequate rate (slow) leads to improved knee extension. They also showed that (i) neglecting to lengthen HS that are short and slow puts subjects at risk for persistent crouch, and (ii) lengthening HS that are already adequate puts subjects at risk for worsened pelvic tilt. The aim of this retrospective study was to test whether a simplified model, based on hip and knee flexion data, could provide similar results.
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