12000. and a previous health care visit yielded a 71% probability of septic ahritis. "Current diagnosis & treatment in spos medicine By Patrick J. McMahon 1/e p210 Now lets come to the question. Here we see that the information supplied is insufficient. ESR is raised but how much, its not given. The WBC count is normal, so we can think in lines of Transient synovitis, but Turek ohopaedics writes about septic ahritis- "The peripheral WBC count is usually elevated, as is the sedimentation rate, although the diagnosis of septic ahritis should not be excluded simply on the basis of normal values for these two studies." So here the diagnosis is unceain. Thus we will proceed with usg guided aspiration of the hip as the next line of management. "Aspiration of the joint must be done when the diagnosis is unceain."- Turek Ohopaedics "Joint aspiration is mandatory for fluid analysis and culture of the synol fluid in cases of septic ahritis.: " - T14rek ohopaedics">