Ischial Bursitis

Excerpt

Ischial bursitis, also known as ischio-gluteal bursitis or "weaver's bottom," is a condition where the bursa that lies between the ischial tuberosity and the gluteus maximus muscle becomes inflamed. This bursa is present physiologically to reduce the amount of frictional force generated between the gluteal muscle and the ischial tuberosity that otherwise might become damaged or irritated by this contact. This inflammation of the bursa most commonly results from prolonged pressure on the ischium, as occurs in sitting for extended periods or from the repeated movement of the gluteus maximus muscle in such activities as bicycling. These activities cause an inflammatory reaction that results in swelling and tenderness over the lower buttock and upper posterior thigh. Many other differential diagnoses have common presentations, such as sciatica and tendonitis of hamstring muscles.