The Most Common Joints Involved During the Course of Rheumatoid Arthritis
| MCP | 90%–95% | Ankle/subtalar | 50%–60% |
| PIP | 75%–90% | Cervical spine (esp. C1–C2) | 40%–50% |
| Wrist | 75%–80% | Elbow | 40%–50% |
| Knee | 60%–80% | Hip | 20%–40% |
| Shoulder | 50%–70% | Temporomandibular | 10%–30% |
| MTP | 50%–60% |
MCP , metacarpophalangeal joint; MTP , metatarsophalangeal joint; PIP , proximal interphalangeal joint.
Involvement of the thoracolumbar, sacroiliac, or hand DIP joints is very rare in RA and should suggest another diagnosis, such as a seronegative spondyloarthritis (sacroiliac joints), psoriatic arthritis (DIP joints) or OA (lumbar spine, DIP joints;
