Pagnano, J Bone Joint Surg Am 1996 - The Effect of Superior Placement of the Acetabular Component on the Rate of Loosening after Total Hip Arthroplasty

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The Effect of Superior Placement of the Acetabular Component on the Rate of Loosening after Total Hip Arthroplasty

Pagnano, Shaughnessy, et al.·J Bone Joint Surg Am·1996·402 citations·Retrospective cohort

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A method for measurement of the true acetabular region and the approximate femoral head center as well as a classification consisting of 4 zones for assessment of the acetabular position of the acetabular cup were used to analyze the results of primary total hip arthroplasty with cement in 117 patients (145 hips). All patients had Crowe type-II congenital dysplasia of the hip. The mean age at the time of the arthroplasty was 51 years (range, 15 to 76 years), and the mean duration of follow-up was 14 years (range, 2 to 22 years). The initial position of the acetabular cup outside of the true acetabular region and outside of zone 1 (inferior and medial) was associated with an increase in the rates of loosening (p < 0.05) and revision (p < 0.04) of the femoral components. Cups that initially were more than 15 millimeters superior to the approximate femoral head center, without lateral displacement, were associated with an increased rate of loosening (p < 0.001) and of revision (p < 0.04) of the femoral components as well as with an increased rate of loosening (p < 0.002) and of revision (p < 0.01) of the acetabular components. These findings suggest that superior positioning of the acetabular component, even without lateral displacement, leads to increased rates of loosening of the femoral and acetabular components. An attempt should be made to position the acetabular component in or near the true acetabular region.

Copyright remains with the authors and publisher.

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The Effect of Superior Placement of the Acetabular Component on the Rate of Loosening after Total Hip Arthroplasty

Pagnano, Shaughnessy, et al.·J Bone Joint Surg Am·1996·402 citations·Retrospective cohort

|

A method for measurement of the true acetabular region and the approximate femoral head center as well as a classification consisting of 4 zones for assessment of the acetabular position of the acetabular cup were used to analyze the results of primary total hip arthroplasty with cement in 117 patients (145 hips). All patients had Crowe type-II congenital dysplasia of the hip. The mean age at the time of the arthroplasty was 51 years (range, 15 to 76 years), and the mean duration of follow-up was 14 years (range, 2 to 22 years). The initial position of the acetabular cup outside of the true acetabular region and outside of zone 1 (inferior and medial) was associated with an increase in the rates of loosening (p < 0.05) and revision (p < 0.04) of the femoral components. Cups that initially were more than 15 millimeters superior to the approximate femoral head center, without lateral displacement, were associated with an increased rate of loosening (p < 0.001) and of revision (p < 0.04) of the femoral components as well as with an increased rate of loosening (p < 0.002) and of revision (p < 0.01) of the acetabular components. These findings suggest that superior positioning of the acetabular component, even without lateral displacement, leads to increased rates of loosening of the femoral and acetabular components. An attempt should be made to position the acetabular component in or near the true acetabular region.

Copyright remains with the authors and publisher.

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