The term acute suppurative conditions is used to include all acute infectious processes that produce pus within the capsule of the hip joint. When thus used it includes such conditions as have been described previously by various writers under the terms acute infectious arthritis,1 acute suppurative arthritis,2 acute epiphysitis,3 acute pyogenic arthritis4 and septic joints.5 Penetrating wounds of the hip with infection and gonorrheal arthritis have purposely been omitted because they are so rarely seen in children.
Because of its peculiar anatomic make-up, the hip joint, oftener than other joints, is the receptacle for pus which originates in the bones forming the articulation. The presence of purulent material in the hip joint by no means implies that its source is an inflamed synovial lining. It is essential to determine accurately whether pus from the hip is originating from the lining membrane or from intra-articular bony