Pellegrini-Stieda syndrome.

The Pellegrini-Stieda "sign" is commonly seen in patients who have a history of trauma to the medial collateral ligament of the knee. Although most are asymptomatic, a few patients will develop the characteristic Pellegrini-Stieda syndrome, which can be severely limiting. When conservative measures fail, surgical treatment consisting of excision of the bony fragment with careful repair of the medial collateral ligament can eradicate the symptoms. This syndrome is reviewed in detail, and an illustrative case report is included.