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Osteoblastoma of the patella. Case report and review of the literature.

Benign osteoblastoma is a rare tumor; the majority of lesions occur in the spine, femur, and tibia. Osteoblastoma in the patella is so rare that it seems not to have been reported previously in more than one case. A 29-year-old man with a sports injury, who failed to respond to conservative treatment over a prolonged period of time, was later found to have an osteoblastoma of the patella.