The radionuclide angiography of femoral head was measured in 10 normal controls and 12 cases of ischemic necrosis of femoral head （INFH） by fracture using 99mTc MDP bone imaging. The results demonstrated that

in normal subjects the difference of femoral perfusion index（FPI） of both femoral head was <0.2

whereas in INFH group >0.4. The difference of FPI between both groups has statistical significance （P<0.001）.Therefore

the measurement of perfusion index of femoral head has some help for INFH dignosis.