Ir Sohail M Amir, Kamran Butt, Sohail Razzaq.
Fat Fracture; Anterior and Medial Knee Pain Rare Cause.
Esculapio J Services Inst Med Sci Jan ;15(4):373-5.

Blunt injury to the anterior aspect of knee results in a fracture of the patella or contusion. And, injury to the extensor mechanism can result in partial or full thickness tear of the patellar or quadriceps tendon. A young girl suffered an injury to her knee after she hit her leg with a hard object.1 Acute swelling in the suprapatellar and medial soft tissues concealed a palpable defect, which initially was suspected a case of patellar dislocation. Magnetic resonance imaging of the knee revealed an intact extensor mechanism; moreover, a partial tear of medial retinaculum was found along with signal changes in the infrapatellar fat pad and diagnosed as a fat fracture.2 Fat fracture is a rare diagnosis. As Conservative management failed, Arthroscopy of the knee was done to debride the fat fracture that effectively treated the injury.3 Blunt injury to the anterior part of knee can cause fracture of the patella or contusion, instability of the patella, and tear of the quadriceps or ligamentum patellae. A blunt injury or undisplaced fracture of the patella can cause point tenderness and anterior knee effusion. A communited fracture of patella or tendon disruption typically has difficulty in extension of the leg. In literature one case of Fat fracture of knee has been reported by blunt injury. Here we present a case of a 17-year-old girl who face a blunt injury to her left knee after hitting her leg with the hard object and got pain on the medial and anterior aspect of knee.

PakMediNet -Pakistan's largest Database of Pakistani Medical Journals - http://www.pakmedinet.com