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

  • Hip Arthroplasty
  • Published:
Archives of Orthopaedic and Trauma Surgery Aims and scope Submit manuscript

Abstract

Introduction

Uncemented 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 methods

We 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.

Results

RSA 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.

Conclusion

We conclude that the Fitmore Hip Stem stabilizes after 3 months and achieves good short-term clinical results in most cases.

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Acknowledgments

We thank Bart Kaptein and Lennard Koster for the RSA analysis and for technical support, and Tina Stölzle for general study support.

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Authors and Affiliations

  1. Orthopedic Surgery, Kantonsspital Graubünden, Loestrasse 99, 7000, Chur, Switzerland

    Yves P. Acklin, Raphael Jenni, Heinz Bereiter & Caroline Thalmann

  2. Orthopedic Surgery, Kantonsspital Baselland, Rheinstrasse 26, Liestal, Switzerland

    Karl Stoffel

Authors
  1. Yves P. Acklin
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  2. Raphael Jenni
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  3. Heinz Bereiter
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  4. Caroline Thalmann
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Corresponding author

Correspondence to Yves P. Acklin.

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The authors declare that they have no conflict of interest.

Funding sources

This study received financial support for statistic and RSA analysis from Zimmer GmbH.

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Acklin, Y.P., Jenni, R., Bereiter, H. et al. Prospective clinical and radiostereometric analysis of the Fitmore short-stem total hip arthroplasty. Arch Orthop Trauma Surg 136, 277–284 (2016). https://doi.org/10.1007/s00402-015-2401-9

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  • DOI: https://doi.org/10.1007/s00402-015-2401-9

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