I'm going to show you how to perform the ulnar grinding test in the assessment of TFCC lesions. As a center of forearm rotation the TFCC plays a key role in stabilization rotation translation and loading transmission to the wrist and acts as an essential pivot point. Due to its anatomical location as well as its involvement in the key functions of rotation and load bearing it is highly prone to injuries and attritional wear. The ulnar grinding test is conducted with the patient's forearm fixed a