Soft-tissue calcification is characterized by the accumulation of calcium in damaged collagen fibrils. The pathogenesis of calcium deposition is not fully understood. Inflammatory changes, trauma, and rheumatological diseases have been reported as possible risk factors. Pellegrini-Stieda syndrome (PSS) is post-traumatic calcification or ossification of the medial collateral ligament with a nonspecific etiology. It may occur after trauma or inflammation or it could be idiopathic. Here we present a case of posttraumatic intraligamentous calcification of the medial collateral ligament (MCL) mimicking Pellegrini-Stieda syndrome (PSS) and review the current related literature.