This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Orthopaedics
Which of the following is not a feature of rheumatoid ahritis? 
Select and explain. 
A. Heberden nodes, B. Swan neck deformity, C. Ulnar detion of fingers at metacarpopalyngeal joint, D. Symmetric reduction of joint space
A: Heberden nodes
Answer: A: Heberden nodes 
Explanation: 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)