The acetabular labrum is a ring of cartilage that surrounds the acetabulum (the socket of the hip joint).
Its function is to deepen the acetabulum, making it more difficult for the head of the femur to slip out of place (sublux).
On January 13, 1991, while playing for the Oakland Raiders, Bo "Knows" Jackson suffered a hip injury where the femur actually did slip out of place.
This resulted in a condition called avascular necrosis resulting in a decreased blood supply to the head of his left femur and deterioration of the femoral head, ultimately requiring that the hip be replaced.
Yankee doctors think he can avoid surgery.
The cyst in the hip was drained Wednesday.
"A" will miss the World Baseball Classic, Yank GM Brian Cashman said.
He will be treated conservatively in the hope of avoiding an operation. "Cash" said that if surgery is needed, Rodriguez would be sidelined for four months.