Boutonniere deformity involves -

Ans. is 'c' i.e., Flexion at PIP and Extention at DIP joint Important hand deformities of hand in RA* Boutonniere deformity: Flexion contracture of PIP joint and extension of DIP joint.* Swan neck deformity: Hyperextension of PIP joint and flexion at DIP joint.* Z-deformity: Radial deviation of wrist with ulnar deviation of fingers.* Hyperextension of 1st interphalangeal joint and flexion of MP joint.