Swan neck deformity is seen in ?: (A) Osteoahritis, (B) Rheumatoid ahritis, (C) Psoriatic ahritis, (D) Gout
Answer is B. Ans. is b' i.e., Rheumatoid ahritis Impoant deformities of hand in RA Boutonniere deformity : Flexion contracture of PIP joint and extension of DIP joint. Swan neck deformit: Hyperextension of PIP joint and flexion at DIP joint. Z-deformity : Radial detion of wrist with ulnar detion of fingers. Hyperextension of 1st interphalangeal joint and flexion of MP joint.