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RA: Classification of MP joint Pathology

- See:
- Classification:
    - Stage I:
         - synovitis;
         - treated w/ splinting;
    - Stage II:
         - joint space narrowing with bone erosions;
         - treated w/ splinting and surgical synovectomy;
    - Stage III:
         - moderate joint destruction w/ volar subluxation & ulnar drift however, moderately good hand function is perserved;
         - treat w/ splinting;
    - Stage IV:
         - advanced joint destruction on X-ray w/ fixed MP joint deformities and loss of hand function;
         - treated w/ MP arthroplasty