Periprosthetic osteolysis may be the most common cause of late failure after total hip arthroplasty perfomed without cement and its incidence is increasing with time.
The purpose of this study was to find out the incidence and the characters of the periprosthetic osteolysis and to analyse its relation with the possible factors; age, sex, body weight, size of the acetabular cup or the femoral stem, stability of
the
femoral stem, and clinical score.
The authors analysed twenty-one cases in eighteen patients of bipolar hemiarthroplasty and twenty-eight cases in twenty-five patients of total hip arthroplasty inserted with non-circumferential porous coated femoral stem of Harris-Galante type
and
femoral head of 28 millimeter diameter from Jan. 1985 to Dec. 1991. All of the patients were followed up for at least four years.
@ES The results obtained were as follows:
@EN 1. Over all incidence of periprosthetic osteolysis was 38% in bipolar hemiarthroplasty and 35.7% in total hip arthroplasty.
2. The pattern of osteolysis in bipolar hemiarthroplasty was 3 focal, 4 multifocal and 1 diffuse osteolysis, and in total hip arthroplasty, 3 focal, 4 multifocal, and 3 diffuse osteolysis.
3. The location of osteolysis around the femoral stem was more frequent in remote areas(zone II to VI) from the joint than periarticular region(zone I and VII)
4. There were no significant relationship between the age, sex, body weight, size of the acetabular cup, size of the femoral stem, stability of the femoral stem, clinical score and incidence of the periprosthetic osteolysis.
Above results suggest that the incidence of the periprosthetic osteolysis after bipolar hemiarthroplasty or total hip arthroplasty inserted with non-circumferential porous coated femoral stem is assumed to be increasing with time, but there was
no
significant difference in incidence of osteolysis between bipolar hemiarthroplasty and total hip arthroplasty.
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