- Passive range of motion in lower extremity joints must be greater than 10 degrees of flexion contracture at the hips as measured by the Thomas Test, at least 20 degrees of hip abduction bilaterally, less than 5 degrees of knee flexion contracture, popliteal angle less than 45 degrees, and at least 0 degrees of ankle dorsiflexion with the knee extended while the foot is in varus