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Harrison's Principles of Internal Medicine, 18e
| Part 15. Disorders of the Joints and Adjacent Tissues > Section 3. Disorders of the Joints and Adjacent Tissues > |
Chapter 337. Periarticular Disorders of the Extremities
Sections: Periarticular Disorders of the Extremities: Introduction, Further Readings.
Topics Discussed: periarticular disorder.
Excerpt:"A number of periarticular disorders have become increasingly common over the past two to three decades, due in part to greater participation in recreational sports by individuals of a wide range of ages. Periarticular disorders most commonly affect the knee or shoulder. With the exception of bursitis, hip pain is most often articular or is being referred from disease affecting another structure (Chap 331). This chapter discusses some of the more common periarticular disorders.Bursitis is inflammation of a bursa, which is a thin-walled sac lined with synovial tissue. The function of the bursa is to facilitate movement of tendons and muscles over bony prominences. Excessive frictional forces from overuse, trauma, systemic disease (e.g., rheumatoid arthritis, gout), or infection may cause bursitis. Subacromial bursitis (subdeltoid bursitis) is the most common form of bursitis. The subacromial bursa, which is contiguous with the subdeltoid bursa, is located between the undersurface of the acromion and the humeral head and is covered by the deltoid muscle. Bursitis is caused by repetitive overhead motion and often accompanies rotator cuff tendinitis. Another frequently encountered form is trochanteric bursitis, which involves the bursa around the insertion..."
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