<prompt> Tom Smith arthritis involvesKneeHipAnkleWrist  <response>: Ans. b Hip Ref Maheshwari orthopedics 4th165TOM SMITH ARTHRITIS Septic arthritis of hip joint in infant Acute onset with rapid abscess formation Head of femur is cartilaginous at this age and hence rapidly and completely destroyed by the pyogenic process. Affected limb shorter and hip movements are increasd in all directions Telescopy test . Complete absence of the head and neck of femur and normally developed round acetabulum on X-ray differentiates it from CDH. Rx:- Arthroscopic wound lavage minimally invasive Rx. 