“…The normal or near-normal values of biochemical and microbiological tests including infl ammatory parameters, bacterial serology, rheumatoid factor, C-reactive protein, antinuclear antibody, and culture of joint fl uid aspiration are suggestive of ICH. 3 The disease process begins with joint hyperemia resulting in periarticular osteopenia, which is the earliest radiographic feature and may persist for a variable period. This is followed by rapid concentric narrowing of the joint space (more pronounced in the central part), thinning and disappearance of the subchondral bone plate, and osseous fl attening.…”