The Shoulder and Physiotherapy
The shoulder, or more strictly the glenohumeral joint, is a major and important joint in the upper limb, responsible mostly for placing the hand in front of the body where the eyes can see it as it performs tasks. To allow this ability the shoulder has a very large range of movement, moderate strength and limited stability. This makes the shoulder a “soft tissue joint”, where the stability and satisfactory function depend on the function of the soft tissues, the ligaments, tendons and muscles. For physiotherapists the shoulder is an important joint, with much treatment and pre- and post-operative rehab required.
The gleno-humeral joint is made up of the ball of the humerus and the socket of the shoulder blade which is called the glenoid surface. The top of the arm bone, the humeral head, is large and carries many of the tendon insertions for the stability and movement of the shoulder. The socket or glenoid is a relatively small and shallow socket for the large ball but is deepened slightly by a fibrocartilage rim called the glenoid labrum. Above the shoulder is the acromio-clavicular joint, a joint between the outer end of the collar bone and part of the shoulder blade, a stabilizing strut for arm movement.
The major stability and flexibility joints of the upper limb shoulder girdle are the scapulothoracic and glenohumeral joints and these joints are held steady and moved by large and powerful muscles. The pectoralis major and latissimus dorsi muscles stabilise and perform strong movements, the serratus anterior stabilises the scapula on the thorax, the rotator cuff stabilises the humeral head on the socket and the deltoid and other muscles perform movements. The shoulder blade and thorax need to be kept in a stable relationship for the glenohumeral joint to perform precise and controlled movements.
The rotator cuff is a group of four small muscles which originate from the scapula and insert around the ball of the humeral head, the teres minor, subscapularis, infraspinatus and supraspinatus. The cuff tendons form a sheet around the ball of the arm bone and allow forces to be exerted on the humeral head by the shoulder girdle muscles. If the rotator cuff is not functioning normally the more powerful muscles tend to make the humeral head slide upwards on the socket, interfering with normal function and making a person unable to lift their arm up above their head.
As a person ages, the rotator cuff develops degenerative changes in its tendinous structures, causing small tears in the tendons which can enlarge until there is no continuity between the muscles and their attachments. This leads to loss of normal shoulder movement and can be very painful but is not always so and “Grey hair equals cuff tear” is a common saying. Physios work at rotator cuff strengthening, whilst in massive tears the main shoulder muscles can be progressively strengthened to improve function. Surgery is possible for massive, moderate and small rotator cuff tears and physiotherapists manage the post-operative protocols.
Osteoarthritis (OA) does not commonly affect the shoulder but there is a group of patients who develop severe arthritic problems in the shoulders, whom physiotherapy can help by maintaining joint ranges and muscle power. Once conservative treatments are exhausted then total shoulder replacement (TSR) is possible, either replacing the ball and socket with new components or reversing the combination. Physiotherapy post-operative management is very important as the shoulder is a “soft tissue joint” in the sense that the strength and balance of the shoulder muscles and other tissues is vital for good outcome.
Physiotherapy treatments include the assessment and management of many different shoulder pathologies such as shoulder fractures and dislocations, sub-acromial impingement, tendinitis, abnormal patterning and hypermobility. Physio treatment for fractures and dislocations depends on the severity and type of injury and follows the physiotherapy and surgical protocols. Patient education and muscle stabilising work is used for hypermobility, while biofeedback and correct muscle activity teaching is the treatment for abnormal patterning. Impingement physio is cuff strengthening and joint mobilisation, with joint injections and surgical acromioplasty if physiotherapy is not successful.
Leave a Comment
You must be logged in to post a comment.