DDx ⬇
Noninflammatory
- Osteoarthritis (degenerative joint disease)
- Hemarthrosis (bleed)
- Sickle cell disease
- Repeated trauma (causing degenerative joint disease)
- Charcot (neuropathic) joint, eg, diabetes mellitus, syphilis
Inflammatory
- Opportunistic infection, eg, tuberculosis of bone and joints, fungal, sporotrichosis
Related DDx ⬆