system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Which of the following is not a feature of rheumatoid ahritis?
assistant
The correct answer is  Heberden does is a feature of osteoahritis and not rheumatoid ahritisImpoant hand deformities of hand in RABoutonniere deformity: flexion contracture of PIP joint and extension DIP jointSwan neck deformity: hyperextension of PIP joint and flexion at DIP joint(Refer: Mohindra's Fundamentals of Ohopedics, 2nd edition, pg no. 88, 101, 127)