Monostotic Paget's disease of the patella

Paget’s sarcoma of the patella

“…Severe patellofemoral osteoarthritis, a common complication of PDB, was present in our case and has previously been described in the patella, the severity of which appears to be proportionate to patellar enlargement with encroachment of the joint space and cartilage loss [11,13,16]. The differential diagnosis in PDB at any site includes metastasis and chronic osteomyelitis in particular, depending on the degree of osteolysis and osteosclerosis related to remodeling.…”

“…PDB confined to the patella is extremely rare. On review of the literature, less than 20 cases are documented in which nine possible cases are included in the English literature [9][10][11][12][13][14][15][16][17] ( Table 1). In Stull's series of five cases, two were definitely polyostotic, one definitely monostotic, and in two cases data on extent of disease was not available.…”