Sacrotuberous ligament ossification
Incidental finding in right hip pain
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Right sacrotuberous ligament and superior pubic ligament ossification
The sacrotuberous ligament is a ligament in the shape of a fan located in the rear side of the pelvis, on both sides and connects the sacrum to the iliac tuberosity.
Composed mainly of collagen fibers, it is strong enough to support the sacrum and prevent adverse changes under body weight.
Normally the sacrotuberous ligament is thin enough and can not be palpated externally. However, when the ligament is stressed, usually with aggressive physical activity or injury, it can become thick and tight. This can also cause the ligament ossification and pressure on the pudendal nerve; but the main difficulty for pregnant women is the shortening of the ligament, which in turn drags the coccyx and ischial tuberosity closer.
Case courtesy: Prof. Fabio Denicolò