• Arch Orthop Trauma Surg · Feb 2016

    Prospective clinical and radiostereometric analysis of the Fitmore short-stem total hip arthroplasty.

    • Yves P Acklin, Raphael Jenni, Heinz Bereiter, Caroline Thalmann, and Karl Stoffel.
    • Orthopedic Surgery, Kantonsspital Graubünden, Loestrasse 99, 7000, Chur, Switzerland. yvespascal.acklin@gmail.com.
    • Arch Orthop Trauma Surg. 2016 Feb 1; 136 (2): 277-84.

    IntroductionUncemented short, curved femoral stems may help save proximal bone stock during total hip arthroplasty (THA) and facilitate insertion in minimal invasive surgery. The aim of this 2 year, prospective, single-center study was to examine the stability and migration of the Fitmore (®) stem in THA using model-based radiostereometric analysis (RSA), and thus predict the implant's long-term survival. In addition, we evaluated the stem's clinical performance using standard clinical measures.Patients And MethodsWe conducted a prospective cohort study of 34 THA patients who received the short Fitmore Hip Stem (Zimmer, Winterthur, Switzerland). At 3, 6, 12 and 24 months postoperatively, the patients underwent clinical evaluation and radiostereometric analysis (RSA) to measure stem migration.ResultsRSA analysis revealed a mean subsidence of -0.39 mm (95 % CI -0.60 to -0.18) at 3 months with no further migration after 2 years. Mean internal rotation along the longitudinal axis was 1.09° (95 % CI 0.52-1.66) at 2 years, versus 0.85° (95 % CI 0.44-1.26) at 3 months. The Harris hip score improved from 60 (range 30-80) preoperatively to 99 (range 83-100) after 2 years. Three patients underwent revision due to deep infection, non-specific thigh pain and aseptic loosening in one case.ConclusionWe conclude that the Fitmore Hip Stem stabilizes after 3 months and achieves good short-term clinical results in most cases.

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