“…Purely mechanical causes include malpositioned, broken, or migrating hardware, such as screws or anchors, resulting in impingement or direct contact with the glenoid or humeral articular surface. 63,75,98 Malalignment or malpositioning of posterior or anterior glenoid bone grafts can also lead to early arthrosis. 1,43,58,59,66,87 Altered glenohumeral joint forces may result from overtightening of the anterior capsule intended to correct instability in the young patient.…”