Unicameral Bone Cyst | Symptoms & Causes

What causes a unicameral bone cyst?

The cause of a unicameral bone cyst remains unknown. Theories have been proposed but none have been definitively proven. One of these theories is that the cysts result from a disorder of the growth plate. Another is that the cysts result from problems with circulation that are caused by a developmental anomaly in the veins of the affected bone. The role trauma plays in the development of these cysts is unknown. Some speculate that repeated trauma puts the bone at risk for developing a bone cyst. This, however, has not been proven.

What are the symptoms of a unicameral bone cyst?

Unless there has been a fracture, bone cysts are without symptoms. They may occasionally be discovered by chance on x-rays obtained for other reasons. There is no mass or tenderness unless there is a fracture. There may be an abnormal angulation of the limb secondary to the fracture or shortening of the limb if the adjacent growth plate is involved.

Keep in mind that each child experiences symptoms differently. The symptoms of a unicameral bone cyst may resemble other conditions or medical problems. Always consult your child's physician for a diagnosis.