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Results of total hip arthroplasty using a bionic hip stem

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Abstract

Purpose

The trabecular-orientated bionic hip stem was designed to mimic the natural force transmission through the femur in total hip arthroplasty, resulting in supposedly longer prosthesis survivability. The aim of this study was to compare the second-generation bionic hip stem to a standard uncemented hip stem.

Methods

A group of 18 patients (21 hips) who underwent total hip arthroplasty with a bionic stem (bionic group) was compared with a historic group of 12 patients (12 hips) treated with standard anatomic hip stem (control group). During the first year after the procedure, the densitometric measurements of the bone around the prosthesis were taken. Radiographic and clinical assessments were additionally performed preoperatively and at the three month, six month, one year and three year follow-ups in the bionic group.

Results

In the bionic group, one patient was revised for aseptic loosening and 16 patients (19 hips) were available to the final follow-up. A significant decrease of bone mineral density was found in Gruen zones 3, 4 and 5 in the bionic group, and in zone 7 in both groups. The bionic group had a significantly higher bone mineral density in Gruen zone 1 at the one year follow-up. At the final follow-up, all prostheses were radiologically stable in both groups.

Conclusions

Provided that a good implant position is achieved, comparable short-term results can be obtained using a bionic stem. Still, a decrease of bone mineral density in Gruen zone 7 occurred in both groups. Further studies are required to determine survivability of the bionic stem.

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Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Orthopaedics, University Clinical Centre, Ljubljanska 5, 2000, Maribor, Slovenia

    Samo K. Fokter

  2. School of Medicine, University of Ljubljana, Ljubljana, Slovenia

    Taras Sarler

  3. Orthopaedic Hospital, Valdoltra, Slovenia

    Andrej Strahovnik

  4. Department for Pathology and Cytopathology, General Hospital, Celje, Slovenia

    Alenka Repše-Fokter

Authors
  1. Samo K. Fokter
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  2. Taras Sarler
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  3. Andrej Strahovnik
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  4. Alenka Repše-Fokter
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Correspondence to Samo K. Fokter.

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Fokter, S.K., Sarler, T., Strahovnik, A. et al. Results of total hip arthroplasty using a bionic hip stem. International Orthopaedics (SICOT) 39, 1065–1071 (2015). https://doi.org/10.1007/s00264-014-2623-4

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  • DOI: https://doi.org/10.1007/s00264-014-2623-4

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