What is metaplastic bone in a ligament.

Metaplasia: Metaplasia is a non malignant change is an organ or tissue. For example, the esophagus if exposed to acid from the stomach can undergo intestinal metaplasia. It becomes similar to the lining of the intestine. In your case trauma has likely caused damage to a ligament which eventually calcified and then became bone. Hopefully this doesn't cause any symptoms.