BLOOD PERFUSION UNEVEN IN FEMORAL-HEAD OSTEONECROSIS - DOPPLER FLOWMETRY AND INTRAOSSEOUS PRESSURE IN 12 CASES

We measured the microvascular regional perfusion in 12 hips with non-t raumatic osteonecrosis of the femoral head, using laser Doppler flowme try (LDF). Simultaneously, the intraosseous pressure (IOP) was measure d in the femoral head. For comparison, the same 2 parameters were meas ured in 6 normal femoral heads during surgery of the contralateral hip . In osteonecrosis, the regional blood cell flux in the intertrochante ric area was 165 mV, at the rim of the lesion 430 mV, and in the necro tic lesion 35 mV. In the same areas, the IOP was 38 mmHg, 61 mmHg and 55 mmHg. In the normal hips, the LDF signal was 221 mV and 224 mV, and the IOP was 21 mmHg and 19 mmHg intertrochanterically and in the femo ral head, respectively. We conclude that the microvascular blood perfu sion is uneven in an osteonecrotic head.