May Be Caused by

 Common

Avascular necrosis

Gout

Infectious arthritis

Juvenile chronic arthritis

Secondary osteoarthritis

 Uncommon

Amyloidosis

Calcium pyrophosphate dihydrate crystal deposition disease

Chondrocalcinosis

Neuropathic arthropathy

Pigmented villonodular synovitis

Regional migratory osteoporosis of the legs

Reiter syndrome

Rheumatoid monoarthritis

Sternocostoclavicular hyperostosis

Sympathetic joint effusion

Synovial cyst

Synovial osteochondromatosis

Synovial sarcoma

Transient osteoporosis of the hips

Tumoral calcinosis