Benign chondroblastoma of the patella is relatively rare. A case of cystic type is presented here, which was managed by curettage and bone graft.
A twenty-five-year-old man was admitted to the hospital on July 4, 1983, with the complaint of the left knee pain. The patient stated that he first noticed the symptom after a contusion of the left knee in December 1982. On examination, tenderness and local heat were evident over the left patella with muscle atrophy in the left lower extremity. The remainder of the skeletal survey was normal. Roentgenograms and CT-scans revealed a cystic lesion of two centimeters in diameter in the proximal third of the left patella. Bone scintigrams showed no increased uptake and laboratory findings were normal. Curettage and bone graft were performed on July 14, 1983, and a diagnosis of benign chondroblastoma was made.
