Epidemiology

Etiology

Because the bursa is not an intraarticular structure, bursitis typically does not interfere with joint range of motion (ie, there is normal, pain-free range of motion) unless it is significantly enlarged or inflamed.
In contrast, intraarticular pathologies (eg, septic arthritis, intraarticular fracture) that involve the capsule, synovium, or bone impair range of motion due to joint effusion and pain; diffuse joint swelling (not localized bursal swelling) is typically present

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