Isolated Paget disease of the patella complicated with ipsilateral femoral head bone marrow edema: a case report and review of the literature.

The patella is rarely affected by Paget disease of bone. The authors report a 54-year-old lady with ipsilateral knee and hip pain, initially misdiagnosed as patella stress fracture and early degenerative hip arthritis, who was later found to have Paget disease of the patella with ipsilateral femoral head bone marrow edema.