Pellegrini-Stieda syndrome or disease. The lesion seen at the medial femoral condyle is known as a Pellegrini-Stieda sign – a calcification which was historically pathognomonic for a previous injury of the medial collateral ligament (MCL). Recent studies, however, have demonstrated that old injuries to the medial gastrocnemius, adductor magnus, and medial patellofemoral ligament can be associated with this calcification .
- Pearl: Pellegrini-Stieda can be seen in patients without knee trauma. It can also be seen in patients with spinal cord injury or traumatic brain injury. This is thought to be more associated with heterotopic ossification or myositis ossificans .