Synovial chondromatosis in raptors

Fourteen raptors, consisting of 13 great horned owls (Bubo virginianus) and one red-tailed hawk (Buteo jamaicensis), from central and north central Mi nnesota, western Wisconsin, and eastern South Dakota (USA) were admitted to a raptor rehabilitation center between June 1992 and June 1995, with peris ynovial and synovial chondromatosis affecting multiple joints. Birds were s everely debilitated primarily due to loss of shoulder motion. The etiology of these lesions in raptors is unknown.