Fig. 12
Separation of patella bipartite in a 70-year-old man. (a) Anteroposterior radiograph of the right knee demonstrates an incidental bipartite patella (arrow). Two years later, the patient presented with anterior knee pain after a fall. (b) Anteroposterior and (c) lateral radiographs and (d) sagittal T1-weighted MR image show separation of the superolateral fragment (solid arrow) within the anterolateral soft tissues of the knee, patella baja (arrowhead), obliteration of the suprapatellar fat (open arrow), and soft tissue swelling and haemorrhage from disruption of the quadriceps tendon (star)