Abstract |
We studied 90 patients(179 femoral heads) with
avascular necrosis of femoral head, who had been
performed X-ray, bone scan and MRI to copare of the
findings of AVN on bone scan between each other,
retrospectively. The patients were 82 males and 9
females, their mean age was 45 years. Radiographic
stages were classifted by Steinberg modification,
radionuclide stages were classified as followed; stage
o(or type 0): noraml, stage 1: faint ring like uptake
around the femoral head, stage 2: intense ring like
uptake, stage 3: irregular increased uptake with
central photon defect, stage 4: intense diffuse
increased uptake at fem- oral head and stage 5: hip
joint deformity with relatively mild increased uptake.
The findings of MRI were classified according to
extent, location, early or advanced lesion, signal
int,ensity of the lesion and joint effusion. 156(87%)
of 179 femoral heads had avascular necrosis, 68(75.5%)
of 90 patients had bilateral AVN, 36 femoral heads had
early stage and 120 had advanced stage. The detection
rate of AVN by X-ray and bone scan were 85%(134), 91.6%
(143), respectively. Early AVN with atypical types of
bone scan showed larger extent, moderate to large
amount of joint effusion, soft tissue hypertrophy
within joint, and secondary degenerative changes. Bone
scan had relatively high detection rate in the
diagnosis of AVN of femoral head, and demonstrated
various t.ypes depending on the disease stage. |