Abstract
Background
Surgeons have several implant choices when managing Vancouver B2 and B3 periprosthetic fractures about the hip. Few long-term studies have reported outcomes for tapered fluted titanium stems.
Questions/purposes
We determined (1) survival, with femoral revision as the end point, of distal taper stems in the treatment of Vancouver B2 and B3 periprosthetic fractures at our institution, (2) radiographic outcomes, and (3) quality of life and hip function after revision.
Methods
Of the 200 patients with Vancouver B2 or B3 periprosthetic fractures treated with femoral revision between February 2000 and February 2010, 55 (38 B2, 17 B3) were treated with modular tapered titanium stems. Of the surviving 47 patients, one was lost to followup, leaving 46 (30 B2, 16 B3) available for review at a mean of 54 months (range, 24–143 months). Initial indications for using these implants were treatment of periprosthetic fractures where less than 4 cm of diaphyseal fit was available, but this evolved during the study period to all fractures unless no diaphysis remained, in which case complex revision techniques were used. Radiographs were assessed to establish fracture healing, stem subsidence, and bone stock restoration. Quality of life and hip function were assessed using WOMAC, Oxford, SF-12, UCLA activity level, and satisfaction scores.
Results
Two femoral stems were revised: one subsided and was revised at 12 months; the other had deep infection and underwent two-stage revision at 49 months. Radiographic review showed one nonunion, with maintenance or improvement of bone stock in 89% of patients. Subsidence occurred in 24%. Mean Oxford score was 76 of 100, WOMAC function and pain scores were 75 and 82 of 100, satisfaction score was 91 of 100, and SF-12 mental and physical scores were 53 and 40 of 100.
Conclusions
We report encouraging short-term results in terms of survival of distal taper stems in the treatment of B2 and B3 periprosthetic fractures. Although subsidence was frequent, most migrated less than 3 mm without correlation to poor pain and functional scores.
Level of Evidence
Level IV, therapeutic study. See the Instructions for Authors for a complete description of levels of evidence.
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Acknowledgments
We thank Eric Sayre PhD for his assistance with the statistical analysis and Daphné Savoy BA for her assistance in the preparation of the manuscript.
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The institution of the authors has received, during the study period, funding from Zimmer, Inc (Warsaw, IN, USA), DePuy Synthes Canada Ltd (Markham, ON, Canada), Johnson & Johnson (Canada) Inc (Markham, ON, Canada), Stryker Canada (Hamilton, ON, Canada), and Bayer Inc (Toronto, ON, Canada). One or more of the authors certify that they have received or may receive payments or benefits, during the study period, an amount of USD 10,000 to USD 100,000, from Zimmer, Inc (JTM, DSG, BAM, CPD), and an amount of USD 10,000 to USD 100,000, from DePuy Synthes Canada Ltd (JTM, CPD).
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Each author certifies that his or her institution approved the human protocol for this investigation, that all investigations were conducted in conformity with ethical principles of research, and that informed consent for participation in the study was obtained.
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Munro, J.T., Garbuz, D.S., Masri, B.A. et al. Tapered Fluted Titanium Stems in the Management of Vancouver B2 and B3 Periprosthetic Femoral Fractures. Clin Orthop Relat Res 472, 590–598 (2014). https://doi.org/10.1007/s11999-013-3087-3
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DOI: https://doi.org/10.1007/s11999-013-3087-3