With the foam ball, exercise of the forearm muscles can be started at a very early stage. The low weight (air cushion) and the terry towelling material give make it very comfortable to wear. Areas of application Impingement syndrome: if the space between the tendons of the shoulder muscles and the synovial bursa is constricted, this is known as impingement syndrome. The most common cause of this condition is regular overuse (wear) of the shoulder tendons and it often occurs amongst swimmers and golfers. If the condition improves, muscle strengthening exercises can be commenced. If there is no improvement, the doctor may decide to operate. Frozen shoulder: if adhesions develop between the synovial bursa and the lower shoulder blade, an arthroscopic operation is generally performed. Here the joint structures are initially corrected and the adhesions are then removed. After a period of immobilisation using the SAK shoulder abduction pad, physiotherapy can start.