Ewings sarcoma of patella: A rare entity treated with a novel technique of extensor mechanism reconstruction using tendoachilles auto graft

Figure 1 Radiograph of the right patella shows multiple lytic and sclerotic lesions involving the anterior two-thirds of the patella.

Figure 2 Haematoxylinand Eosin staining shows uniform, small, polygonal cells with scanty cytoplasm and indistinct cell borders (HE × 400) and Immunohistochemical staining shows CD99 diffuse positivity (A and B).

Figure 3 Peroperative picture shows thickened patella with uninvolved articular surface.

Figure 4 Peroperative picture shows repair of the extensor mechanism using V-Y plasty and split tendoachillesautograft.