Hip Cysts

A subchondral cyst is a fluid-filled space inside a joint that extends from one of the bones that forms the joint. This type of bone cyst is caused by osteoarthritis. It may require aspiration (drawing the fluid out), but the arthritis condition usually must also be addressed to prevent further cyst formation.

Anteroposterior (front-to-back) X-ray of a hip with osteoarthritis. The arrow points
to both a sclerosis (thickening of bone) and subchondral cyst in the acetabulum.