Teenager who fell on their right knee and has pain

Musculoskeletal
Radiograph of lateral patellar dislocation
AP (above) and Merchant (below left) radiographs of the right knee show lateral displacement of the patella and a small avulsion fragment (sliver sign) medial to the patella. Merchant radiograph of the right knee post reduction (below right) shows appropriate reduction of the patella along with medial soft tissue swelling.

The diagnosis was lateral patellar dislocation.

Published