Jett 130 and Zero and sit bone LUMP

[SadieKate]

Uh oh. Read down farther in that link about Ischial Tuberosity Syndrome.

Ischial bursitis needs to be differentiated from ischial tuberosity syndrome. The ischial tuberosity is a swollen part or broadening of the bone in the frontal portion of the ischium, the lowest of the three major bones that make up each half of the pelvis. As the point of fusion of the ischium and the pubis, it is attached to various muscles and supports the weight of the body when one is sitting. Ischial tuberosity pain may be experienced by a wide range of athletes, including soccer players, cyclists, baseball players, figure skaters, cheerleaders and any type of jumpers or runners. It is often misdiagnosed as ischial bursitis, an extremely painful condition.

The ischial tuberosity is the point of origin of the adductor and hamstring muscles of the thigh, as well as the sacrotuberus ligaments. The forceful pull of these muscles, such as can happen during a variety of sports, as a result of a trauma such as a fall or other type of injury, or through the overuse of the hamstrings, as is common among runners and soccer players, results in a separation or detachment, also called an avulsion, of an open ischial apophysis.