Joint mice are seen in the following disease :
Degenerative joint disease or osteoarthritis is a non-inflammatory disorder of joints characterized by joint deterioration and new bone formation. The new bone formed is called osteophyte. In severe cases, the osteophytes may break-off and lie free within joint space. These fragments are known as "Joint mice or mouse" and these must be differentiated from other conditions that cause joint radiopacities.
Osteoarthritis
Rheumatoid arthritis
Juvenile arthritis
All of the above