Give 4 key features of rheumatoid arthritis
1. Swan neck deformity - hyperextension of the PIPJ of the finger with flexion of the DIPJ
2. Boutonniere deformity - flexion of the PIPJ of the finger with hyperextension of the DIPJ.
3. Gel phenomenon - after rest the pts jt stiffens and becomes painful to move.
4. Symmetrical inflammatory polyarthritis