Clark's test (patellar grind test) is specifically used to help diagnose chondromalacia by assessing any grinding or pain. During this test, you'll lie down and squeeze your quad muscles (front ...

KOOS-PF items loaded predominantly on one factor, pain during activities that load the patellofemoral joint. KOOS-PF had good internal consistency (Cronbach’s α 0.86) and adequate test–retest ...