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Abstract
Background and purpose Metaphyseal anchored short-stem hip implants were designed to improve load transmission and preserve femoral bone stock. Until now, only few outcome data have been available and migration studies are one of the few ways of obtaining data that are predictive of implant survival. We therefore evaluated a metaphyseal anchored short-stem hip implant by Ein Bild Roentgen Analyse femoral component analysis (EBRA-FCA).
Patients and methods First, the EBRA-FCA method was validated for the short-stem hip implant. Then 80 of the first 100 consecutive implants were evaluated after at least 2 years. Clinical assessment was performed using the WOMAC and the UCLA score.
Results After 2.7 (2.0–4.2), years none of the implants had been revised and by that time the stems had subsided by a mean of 0.7 mm (SD 1.8) (95% CI: 0.3–1.1). Of the 80 implants, 78 were stable after 2 years, with 74 being primary stable and 4 showing secondary stabilization after initial subsidence. Continuous migration was seen in only 2 patients. The clinical outcome showed good results with a mean WOMAC of 11 (SD 13) and a mean UCLA score of 7.3 (SD 2.0). [OK?]
Interpretation The metaphyseal anchored short-stem hip implant showed good functional results and a high degree of stability after 2 years. The outcome is comparable to that of clinically proven conventional hip implants and if the results are confirmed by long-term studies, short-stem hip arthroplasty might be an alternative for young patients requiring hip replacement.
FS and VJ designed the study. AF, FM, and VJ performed the operations. FS and TG gathered the data. TG and ABM performed the evaluation study. FS performed the statistical analyses. FS, AF, FM, and VJ wrote the final manuscript.
The authors thank Nora Goudsouzian for proofreading of the manuscript and Michael Lauseker for expert advice in statistics.
FS, AF, and VJ received research support and/or held paid lectures for B.Braun, Aesculap, not related to this study. The study was planned, conducted, and analyzed independently. No benefits, grants, or funding were received by any of the authors for planning, performing, or publishing this study. The study is part of the doctoral thesis of TG.