Shoulder instability means the shoulder joint is not stable, and slides around too much in the socket. For some patients, the unstable shoulder slips out of the socket, which is caused subluxation. If left untreated, shoulder instability leads to shoulder joint arthritis. What parts of the shoulder are affected by instability? The shoulder is made

The posterior cruciate ligament (PCL) is a tough band of tissue connecting your thigh bone (femur) to the shin bone (tibia). The PCL is one of four main knee ligaments. A tear in the PCL is a common sports injury. How common are PCL tears? PCL tears comprise less than 20% of all knee ligament