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What is Bursitis ?
Inflammation of the bursas is called bursitis (or bursal synovitis). Bursas sometimes are involved along with the joints and tendon sheaths in rheumatoid arthritis and gout. Infectious agents introduced by penetrating wounds or borne by the bloodstream also may result in bursitis, but this is unusual. The prepatellar bursa, located on the lower part of the kneecap, is especially subject to involvement in brucellosis (undulant fever).
The cause of most cases of bursitis appears to be one or another local mechanical irritation. Often the irritation is of occupational origin and occurs in the shoulder region, at the knee, near the hip, and elsewhere. The inflammatory reaction is not a distinctly particularized one and may or may not include deposition of calcium salts. The borderline between bursitis and other painful rheumatic conditions of the soft tissues is indistinct in many instances.
Types of Bursitis
The most common form of bursitis affects the subdeltoid bursa, which lies above the shoulder joint. Bursitis in this circumstance is not the primary abnormality, but results from degeneration and calcification of the adjacent rotator tendon. Direct injury is not usually the cause of calcium deposits and inflammation in the tendon; indeed, heavy labourers are less frequently affected than persons engaged in less strenuous occupations. The bursa proper is affected only when debris from the tendon extends into it, this intrusion being the principal cause of an acutely painful shoulder. The condition occurs most often in middle age and is infrequent among young children. Women are twice as likely to have the condition as men. The onset may be sudden and unprovoked. Pain and tenderness are great and there is difficulty in raising the arm. No single method of dealing with the disorder in all affected persons is known, and response varies widely among individuals. Resting the arm and use of analgesics tend to lessen the discomfort, corticosteroids may reduce inflammation, and carefully graduated exercises may be used to lessen the possibility of lasting stiffness of the shoulder. Many months may pass before complete recovery is attained. Chronic inflammation of the bursa at the side of the hip joint—trochanteric bursitis—has a similar course.
The more clearly traumatic forms of bursitis are exemplified by “beat knee,” a bursitis that develops below the kneecap of miners who must kneel over long periods to work narrow coal seams. Bloody fluid distends the bursa and, unless removed early, may cause the walls of the bursa to become thickened permanently. Treatment, which involves protection from further irritation to the extent that this is possible, is otherwise similar to that for subdeltoid bursitis. A fair proportion of these lesions become infected as a consequence of injury to the overlying skin.
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