<prompt> All of the following joints are involved in rheumatoid ahritis, EXCEPT :PIPDIPMCPCervical spine  <response>: Joint involvement is the characteristic feature of rheumatoid ahritis RA. In general, the small joints of the hands and feet are affected in a relatively symmetric distribution. The most commonly affected joints, in order of decreasing frequency, include the metacarpophalangeal MCP, wrist, proximal interphalangeal PIP, knee, metatarsophalangeal MTP, shoulder, ankle, cervical spine, hip, elbow, and temporomandibular joints. Cervical spine involvement usually affects C1-C2. 