Physiotherapy for the Shoulder

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 shoulder joint is constructed from the socket of the scapula and the humeral head, the ball at the top of the upper arm bone. The head of the upper arm is a large ball and important tendons insert onto it to move and stabilise the shoulder, but the shoulder socket, the glenoid, is small in comparison and very shallow. A cartilage rim, the labrum of the glenoid, deepens the socket and adds to stability. The acromio-clavicular joint lies above the shoulder joint proper and provides dynamic stability during arm movements, being made up from part of the scapula and the outer end of the clavicle.

A great many muscles act on the shoulder joint and on the other joints in the shoulder girdle, the acromioclavicular, sternoclavicular and scapulothoracic joints. The glenohumeral and scapulothoracic joints are acted upon by the major stabilisers and movers in the area, varying from power muscles which allow forceful work to stability muscles such as serratus anterior and the rotator cuff to smaller movement muscles such as deltoid. The muscles must keep the relationship between the shoulder blade and the thorax and ribcage steady and under control for the glenohumeral joint to also enjoy stability and precise movement.

The shoulder muscle tendons become flatter and thinner as they approach and then insert themselves onto the head of the humerus. By this way the rotator cuff, a group of four muscles including the supraspinatus, infraspinatus, teres minor and subscapularis, is able to exert its forces on the humeral head. The tendons coalesce as they surround and insert onto the ball of the humerus, forming a cuff around the ball, centering the ball on the socket to counter the tendency to slide upwards under muscle activity. Keeping the ball centred on the socket means the larger and more powerful muscles can perform functional shoulder and arm movements.

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.

The shoulder joint is not typically affected by OA (osteoarthritis) but when it is physiotherapists treat arthritic shoulders by joint mobilisations, muscle strengthening and ranges of motion. Once physio has nothing else to offer, total shoulder replacement is one of the further options, with various surgical techniques involving replacing the humeral ball and the scapular socket either anatomically or in reverse. The shoulder is often called a “soft-tissue joint” as the soft tissues, their strength and balance, are vital to the function of the joint. Post-operative physio management is essential as the correct protocol must be closely followed to ensure success.

Physiotherapists treat many other types of shoulder problems such as impingement, tendinitis, hypermobility, abnormal muscle patterning, fractures and dislocations. Impingement is treated by strengthening the rotator cuff or by subacromial injection or acromioplasty operation, where the end of the acromion can be excised. Tendinitis is treated by direct treatment of the tendon and graded strengthening and hypermobility by stability work and accepting the limitations dictated by the condition. Abnormal muscle patterning is managed by teaching normal patterns functionally and fractures and dislocations by the protocols laid down by the surgeons and trauma physiotherapists.

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