The purpose of this study is to evaluate the MR signal abnormality and the histologic changes in the femoral neck in the patient of AVN of the femoral head, to evaluate the factors that affect the changes in the the femoral neck, to correlate the
head
involvement according to radiographic staging and MR imaging with the MR signal and histologic changes in the femoral neck.
Forty-five hips in 37 patients who had AVN of th femoral head (> stage III) were studied with radiography and MRI. Twenty femoral head and neck specimens for histologic study were obtained intraoperatively.
Patient data such as age, sex, site, bilateraity, weight, activity, the history of alcohol or steroid showed no statistically significant difference according to femoral neck involvement. Abnormal MR (difffuse, Mitchell calls C, 10 cases), Type
B(localized, Mitchell class D. 4 cases), Type C(localized with central lesion, Mitchell class A, 5 cases).
This study demonstrated that changes on MR imaging and histologic findings in the femoral neck were increased when the extent of involvement of the femoral head on the radiograph and MR imaging is extensive. Further study such as a clinical study
combined with MRI and histologic study is required to know the influence of the histologically changed area on the of comentless THA
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