Range of motion measurements were taken using a goniometer as described by Norkin and White.37 Range of motion measurements were recorded as A-B-C, with A being the degrees of hyperextension, B indicating lack of extension from zero, and C documenting the degrees of flexion. Measurements were taken by the treating physical therapist. Intra-tester and inter-tester reliability measurements of the treating therapists were high (kappa > 0.8) for both flexion and extension.38 Knee range of motion was recorded at the initial visit and at 1 and 3 months after the initial visit. The IKDC objective form grades range of motion as normal, nearly normal, abnormal, or severely abnormal. Range of motion was graded according to IKDC criteria (Table 1).