Volumetric Measurement And Predicting The Collapse Of Osteonecrosis Of The Femoral Head Using Computerized MRI

Objective Computerized techniques was recorded to restructure a three-dimensional model of osteonecrosis of the femoral head using MRI (T1 -weighted) coronal data sets. Necrotic lesion location was confirmed directly and the volume of the osteonecrosis was measured. The values were compared with direct anatomical measurements of the femoral heads obtained after total hip arthroplasty to explore the accuracy and the clinical worth.Methods 29 patients (38 hips) with osteonecrosis of the femoral head at late stage were performed by total hip arthroplasty. There were 23 males and 6 females with a mean age of 45.5 years (range: 26-68 years). Osteonecrosis was idiopathic in 3 patients(3 hips), related to steroid use in 14 patients(18 hips), and related to alcohol abuse in 12 patients(17 hips). Of the 38 hips, 9 were in stage III and 29 were in stage IV according to the ARCO international staging system. All patients were subjected to MRI imaging before operation and the slice thickness was 2 mm without interslice gaps. MRI (T1-weighted) coronal data sets were transferred to a computer in DICOM format using import and export images software(Mimic). Outlines of the necrotic lesion which was considered to be the sector demarcated by the serpiginous line...