Authors reviewed 45 cases of bipolar hip arthroplasty and 70 cases of total hip arthroplasty which were performed as the management of avascular necrosis of femoral head with Ficat-Arlet stage III and IV from October, 1985 to October,
1991 to
compare the results in both groups.
And we also tried to identify the risk factors correlted with remarkable disadvantages in bipolar hip arthroplasty.
@ES The results were as followings:
1) As compared with the results of total hip arthroplasty, those of bipolar hip arthoplasty were markedly disadvantageous in terms of the incidence of acetabular erosion and proximal migration, and relatively disadvantageous to some
extent in
terms of incidence of groin or buttock pain, chronologic changes in hip function, and somewhat disadvantageous in terms of motion of external rotation which is necessary for cross leg pcsition
2) 2) As compared with the results of total hip arthroplasty, those of bipolar hip arthroplasty were markedly advantageous in terms of intraopelative blood loss and operation time, and slightly advantageous in the incidence of deep vein
thrombosis.
And withrespect to another varables such as loosening rate of stem, incidence of thigh pain, the results were similar in both groups.
3) Heavy worker was a significantly meaningful risk factor and heavy weight more than 60Kg seemed to be another relatively meaningful risk factor to cause proximal migration of the bipolar cup.
4) In overall view, the results of bipolar hip arthroplasty were rather inferior to those of total hip arthroplasty especially in terms of acetabular proximal migration and groin or buttock pain.
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