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. 2010 Jul;468(7):1855-61.
doi: 10.1007/s11999-009-1066-5.

THA with the ABG I prosthesis at 15 years. Excellent survival with minimal osteolysis

P N Baker  1 , I A McMurtry, G Chuter, A Port, J Anderson
Affiliations

THA with the ABG I prosthesis at 15 years. Excellent survival with minimal osteolysis

P N Baker et al. Clin Orthop Relat Res. 2010 Jul.

Abstract

Following recent reports of poor results with the hydroxyapatite-coated ABG I prosthesis, we report the survival of a series of 63 patients (69 hips) at a mean of 15 years (range, 13-17 years). In total, eight patients had revision procedures. The reason for revision was acetabular loosening in all cases. In only one case was there associated clinical and radiographic loosening of the femoral stem. The 15-year survival of the acetabular component was 86.9% (95% confidence interval, 71.7%-96.0%) and the 15-year survival of the femoral component was 98.6% (95% confidence interval, 88.8%-100.0%). Periacetabular osteolysis was seen in 10 of 59 (17%) surviving hips. In these hips the components remained well fixed owing to the remaining bone-component contact. There was no difference in the Oxford hip score between patients with well-fixed hips and evidence of osteolysis and patients with hips without evidence of osteolysis. Multivariate analysis failed to reveal any factors associated with the presence of osteolysis (gender, age at primary surgery, Oxford hip score, cup abduction, and acetabular polyethylene wear rates). The ABG I prosthesis continues to show excellent long-term results. Ongoing radiographic review is recommended to detect progressive osteolysis that otherwise remains clinically silent until failure.

Level of evidence: Level IV, Case series. See Guidelines for Authors for a complete description of levels of evidence.

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Figures

Fig. 1
Fig. 1
A survival curve with binomial 95% CIs for the acetabular component of the ABG I prosthesis is shown.
Fig. 2
Fig. 2
A survival curve with binomial 95% CIs for the femoral component of the ABG I prosthesis is shown.
Fig. 3
Fig. 3
An AP radiograph of a surviving ABG I prosthesis shows evidence of osteolysis in all three DeLee and Charnley acetabular zones. The osteolysis in Zones 2 and 3 is of low volume and this implant was considered well fixed. This patient had an OHS of 14 of 60 at 13 years postoperation.
See this image and copyright information in PMC

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