40 years patient having arthritis of PIP and DIP along with carpometacarpal joint of thumb and sparing of wrist and metacarpophalangeal joint, most likely diagnosis is: (A) rheumatoid arthritis, (B) osteo arthritis, (C) psoriatic arthritis, (D) pseudo gout
Answer is B. Ans. is 'b' i.e.osteoarthritis Now, this form of question (where arthritic involvement of a group of joints are given) is very frequently asked:Osteoarthritis- Joints involved :PIP, DIP, Base of thumbSparing of wrist & metacarpophalangeal junction.Psoriasis: - Joints involved :PIP, DIP, Wrist, metacarpophalangeal joint.Rheumatoid arthritis - DIP is not involved characteristically.Joints involvedMetacarpophalangeal joints (MC) esp of index finger PIP, wrist, elbow, knee, ankle.