Involvement of PIP jt, DIP jt and the carpo-mcp jt of base of thumb with sparing the wrist is seen in:
**Core Concept**
The question is testing the understanding of the clinical presentation of a specific joint condition, specifically the involvement of peri-articular joints and sparing of the wrist. This is related to the concept of osteoarthritis and its patterns of joint involvement.
**Why the Correct Answer is Right**
The condition described is likely to be a deformity known as **Bennett's fracture**, which involves the base of the thumb. Involvement of the PIP (Proximal Interphalangeal) joint, DIP (Distal Interphalangeal) joint, and the carpo-metacarpal joint at the base of the thumb with sparing of the wrist is a characteristic feature of this condition. This is due to the specific anatomy and mechanics of the thumb joint.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specifically relate to the joint involvement pattern described in the question.
**Option B:** This option is incorrect because it is a different type of joint injury that does not match the pattern of joint involvement described.
**Option C:** This option is incorrect because it is a different type of joint condition that does not match the pattern of joint involvement described.
**Clinical Pearl / High-Yield Fact**
Bennett's fracture is a type of fracture-dislocation of the base of the thumb that can lead to a characteristic deformity known as a "thumb spica" cast. This is a common complication of this condition and requires prompt medical attention.
**Correct Answer: D. Bennett's fracture**