↵^a Op=“operated” (ie, the limb that had undergone surgery), Non-op=“nonoperated” (ie, the limb that had not undergone surgery), quad=quadriceps muscle, ABD=abductor, TUG=Timed “Up & Go” Test, SCT=Stair Climbing Test, 6MWT=Six-Minute Walk Test, KOS-ADLS=Knee Outcome Survey Activities of Daily Living Scale, GRS=Global Rating Scale.