<prompt> Tom Smith AhritisPyogenic Infection of infancyTBRheumatoid ahritis in childrenOsteoahritis in Middle aged men  <response>: Tom Smith ahritis is the septic ahritis of the hip joint, occurs in infancy. At this stage head of the femur is cailaginous and is rapidly and completely destroyed by the pyogenic processRefer: Mohindras Fundamentals of Ohopedics, 2nd edition, pg no. 289 