<prompt> Osteoarthritis does not involve?Hip jointDIPAnkle jointCervical region  <response>: ANSWER: C Ankle jointREF: Harrisons 18th ed chapter 332Commonly affected joints in osteoarthritis include:Cervical and lumbosacral spine, hip, knee, and first metatarsal phalangeal joint MTP.In the hands, the distal interphalangeal joints heberdens node, most common and proximal interphalangeal joints bouchards node and the base of the thumb 1st CMC are often affected.Joints usually spared are:WristElbowAnkleMCPRadiological features of OA:Narrowing of joint space earliest featureSclerosis of subchondral boneCystic lesions, osteophytes, loose bodies. 