[Changes in blood flow characteristics as a cause of non-traumatic femur head necrosis].

Most authors associate avascular necrosis of the femoral head with ischemia, caused by injuries or diseases of the nutrient vessels or by alteration of the hemorheology. We examined the rheological properties of the blood in 39 patients with nontraumatic avascular necrosis of the femoral head by following tests: viscosimetry, filtrometry and aggregation of red blood cells. Aggregation of red blood cells showed statistically significant pathologic alterations. Our results confirm that irreversible agglutination phenomenons followed by ischemia can be caused by 1. stenosis or obliteration of nutrient vessels 2. rheologic alterations of the blood.