Osteoarthritis:
- Asymmetric joint space narrowing
- Marginal osteophytes
- Subchondral cystic change
- Subchondral sclerosis
FINDINGS: Severe first metatarsophalangeal joint osteoarthritis characterized by joint space narrowing, osteophytosis, and subchondral cystic change. Scattered interphalangeal joint osteoarthritis, most pronounced at the second digit distal interphalangeal joint.
Gout:
- Sharply marginated, juxta-articular erosions with overhanging margins
- Nodular, soft-tissue swelling/mineralization (tophi)
FINDINGS: Juxtaarticular erosion of the first metacarpal head with adjacent soft tissue prominence and faint internal mineralization. Osteoarthritis of the first metatarsophalangeal joint.
Neuropathic Arthropathy:
- Sequela of chronic neurosensory deficit usually most pronounced at the midfoot
- Joint destruction
- Dislocation
- Osseous fragmentation and remodeling
FINDINGS: Extensive destructive changes of the midfoot with tarsal fragmentation and midfoot collapse, likely relating to neuropathic arthropathy. Associated dorsal subluxation and osseous remodeling of the metatarsal bases with respect to adjacent tarsal remnants and talar head. Diffuse soft tissue swelling, most pronounced at the midfoot and hindfoot. Vascular calcifications.