Punit Tiwari on Instagram: "Patellar Grind Test (Clarke's Sign): Purpose: Assesses for patellofemoral pain syndrome, chondromalacia patellae, or arthritis behind the kneecap. Procedure: Patient lies supine with the knee extended. The examiner applies downward pressure on the superior patella and asks the patient to tighten their quadriceps. Positive Result: Pain, grinding sensation, or inability to hold the contraction. #instagramreels #instagood #kneepain #painmanagement #physiotherapy"