Journal List > J Korean Orthop Assoc > v.42(2) > 1012646

Han, Yang, and Park: Femoral Revision with the Wagner SL Revision Stem

Abstract

Purpose

To evaluate the results of revision total hip arthroplasty using a Wagner SL revision stem.

Materials and Methods

This study reviewed 56 revisions of the femoral component performed using a Wagner stem in 55 patients between 1992 and 2001. The mean age of the patients at the time of the revision was 50 years. The mean follow up duration was 8.4 years (range, 5 to 12.5 years). The indication for revision was aseptic loosening in fifty-two hips, septic loosening in two and periprosthetic fractures in two. The pre-revisional femoral defects were classified according to the Paprosky classification system. A clinical evaluation and radiological assessment were performed.

Results

The mean Harris hip score improved from 47 points preoperatively to 87 points at the latest follow-up. There were 5, 20, 22 and 9 hips of type I, II, IIIA and IIIB according to the Paprosky classification system. Fifty two hips (93%) showed stable stems at the latest follow-up radiographs. The mean vertical subsidence of the stem was 6.2 mm (range, 0 to 21 mm). Severe progressive vertical subsidence in three hips and an infection in one occurred requiring repeat revision.

Conclusion

For severe proximal femoral bone loss, the conical femoral revision stem with a fully grit-blasted surface produced satisfactory results with distal press-fit fixation. We can expect a decrease in the rate of mechanical failure rate of the stem by reducing the subsidence derived from the stem design itself.

Figures and Tables

Fig. 1
Available lengths and diameters of the Wagner SL revision uncemented stem in the preoperative planning are ranging from 190 mm to 385 mm, from 14 mm to 25 mm respectively.
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Fig. 2
Kaplan-Meier survivorship curve for the Wagner revision stem with failure defined as removal for any cause demonstrated that the cumulative survival rate was 91.2% (95% confidence interval, 86.5% to 96.0%) at 12.4 years.
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Fig. 3
(A) Radiograph of 48 year old man showed aseptic loosening after primary total hip arthroplasty due to avascular necrosis of femoral head. (B) Radiograph demonstrated stable fixation of the Wagner stem and osseous restoration of proximal femur with allograft 13 years after revisional total hip arthroplasty.
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Table 1
Results of Proximal Femoral Restoration Classified as A, B, C with or without Allograft Inserted at Femoral Bone Defects according to the Comparison between Immediate Postoperative Radiographs and the Latest Follow-up One
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*Numbers mean the number of cases.

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