Rotator cuff tear be 2 to 3 times more common than bursal-sided tears and among a population of young athletes, articular-sided tears constituted 91% of all partial-thickness tears. Rotator cuff tear A rotator cuff tear is an injury of one or more of the tendons or muscles of the rotator cuff of the shoulder. Symptoms may include shoulder pain, which is often worse with movement, or weakness. This may limits people's ability to brush their hair or put on clothing. Clicking may also occur with movement of the arm. Tears may occur as the result of a sudden force or gradually over time.
Synovial sheath Synovial sheath A synovial sheath is one of the two membranes of a tendon sheath which covers a tendon. The other membrane is the outer fibrous tendon sheath. The tendon invaginates the synovial sheath from one side so that the tendon is suspended from the membrane by the mesotendon, through which the blood vessels reach the tendon, in places where the range of movement is extensive. The mesotendon disappears or remains in the form of narrow tendinous bands as threads known as vincula tendina. The synovial sheath is found where the tendon passes under ligaments and through osseofibrous tunnels; their