Abstract
Background
Currently, the two most commonly used options for the revision of femoral components in North America are: cylindrical, nonmodular, cobalt-chromium stems and tapered, fluted, modular, titanium (TFMT) stems. Previous reports have cited high failure rates with cylindrical cobalt chrome stems in large femoral defects but the longer term survival of the fluted stems is unknown.
Questions/Purposes
We examined the 5- to 10-year survival of TFMT stems implanted for severe femoral defects.
Methods
We reviewed all 65 patients with severe proximal bone defects revised with the TMFT stem between January 2000 and 2006. Ten were lost to followup and seven were dead, leaving 48 patients for followup at 5 to 10 years (mean, 84 months; range, 60–120 months). All patients completed five quality-of-life (QOL) questionnaires. Radiographs were evaluated for loosening, subsidence, and preservation of proximal host bone stock.
Results
Implant survivorship was 90%. No patient underwent revision for either subsidence or loosening. Subsidence occurred in seven patients (average, 12.3 mm) but all achieved secondary stability. Five patients underwent revision as a result of fracture of the stem and all had the original standard stem design, which has since been modified. All five implant fractures occurred at the modular stem junction. Mean QOL outcomes were: WOMAC = 81 (pain), Oxford = 75, SF-12 = 54 (mental) and 38 (physical), UCLA Activity = 4, and satisfaction overall = 73.
Conclusions
Midterm survivorship of modular titanium stems in large femoral defects is high; however, ongoing surveillance of stem junctional fatigue life is required.
Level of Evidence
Level IV, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.
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Acknowledgments
We thank Daphné Savoy for her assistance in the preparation of the manuscript.
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One of the authors (CPD) certifies that he has or may receive payments or benefits, in any one year, an amount in excess of $10,000, from a commercial entity (Zimmer, Inc, Warsaw, IN, USA) related to this work. One of the authors (BAM) certifies that he has or may receive payments or benefits, in any one year, an amount in excess of $10,000, from a commercial entity (Zimmer, Inc) related to this work. One of the authors (DSG) certifies that he has or may receive payments or benefits, in any one year, an amount in excess of $10,000, from a commercial entity (Zimmer, Inc) related to this work. The institution of one or more the authors (APVH, CPD, BAM, NVG, DSG) has received funding from Zimmer Inc.
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Van Houwelingen, A.P., Duncan, C.P., Masri, B.A. et al. High Survival of Modular Tapered Stems for Proximal Femoral Bone Defects at 5 to 10 Years Followup. Clin Orthop Relat Res 471, 454–462 (2013). https://doi.org/10.1007/s11999-012-2552-8
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DOI: https://doi.org/10.1007/s11999-012-2552-8