The Shoulder and Physiotherapy
Posted on November 30, 2008
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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.
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.
Around the shoulder all the muscles narrow down into flat, fibrous tendons, some larger and stronger, some thinner and weaker. All these tendons are anchoring themselves to the humeral head, allowing their muscles to act on the shoulder. The rotator cuff includes a group of relatively small shoulder muscles, the subscapularis, the supraspinatus, the infraspinatus and the teres minor. The tendons form a wide sheet over the ball, allowing muscle forces to act on it. The rotator cuff, despite its name, acts to hold the humeral head down on the socket and allow the more powerful muscles to perform shoulder 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.
Osteoarthritis (OA) more commonly affects the hips and the knees, however the shoulder can be severely affected in which cases physiotherapy can help with advice, mobilisation of the joints and work on strength and joint motion. Once physiotherapy treatment has been tried then total shoulder replacement is the only remaining treatment option, surgical replacement occurring of the head of the arm bone and the socket of the shoulder blade. As the shoulder is referred to as a “soft-tissue joint” it is the balance and strength of the tendons, muscles and ligaments that determines a good outcome for the replacement. Physiotherapists closely follow the surgical protocols to get the optimal results.
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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