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International Orthopaedics

, Volume 40, Issue 8, pp 1607–1614 | Cite as

Analysis of migration of the Nanos® short-stem hip implant within two years after surgery

  • Stefan BuddeEmail author
  • Frank Seehaus
  • Michael Schwarze
  • Christof Hurschler
  • Thilo Floerkemeier
  • Henning Windhagen
  • Yvonne Noll
  • Max Ettinger
  • Fritz Thorey
Original Paper

Abstract

Purpose

Short-stem implants provide a bone-preserving alternative in total hip arthroplasty. However, some evidence exists that the smaller implant-bone contact surface may compromise primary stability and impair osseo-integration. The purpose of this study was to analyse the migration characteristics of the Nanos® short stem over two years by means of model-based roentgen stereophotogrammetric analysis (MBRSA).

Methods

Eighteen patients aged 53.6 ± 7.2 years were included. After being treated with a Nanos implant, 14 patients were followed-up radiologically at three, six, 12 and 24 months by means of MBRSA. Early implant migration was calculated. Clinical data have been assessed in addition.

Results

Highest translational migration was observed with a mean value of –0.22 ± 0.39 mm along the proximo-distal axis after three months and highest rotational migration with 0.8 ± 3.2° also around the y-axis after two years. The resulting total migration was 0.46 ± 0.31 mm, with the largest proportion occurring within three months after surgery (0.40 ± 0.34 mm).

Conclusion

The Nanos short-stem hip implant shows only a slight initial migration within three months after implantation, followed by secondary stabilisation. These results suggest both good primary stability and osseo-integration, suggesting a low risk of aseptic loosening.

Keywords

RSA Total hip arthroplasty Short stem Migration 

Notes

Acknowledgments

The authors wish to thank Christina Keller for processing the RSA radiographs. Smith & Nephew Orthopaedics AG (Baar, Switzerland) acted as the sponsor of this study, granting financial compensation for expenses. The company took part neither in analysis and interpretation of data nor in preparation of the manuscript. None of the authors had a further conflict of interest that may have biased the study.

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Copyright information

© SICOT aisbl 2015

Authors and Affiliations

  1. 1.Department of Orthopaedic SurgeryHannover Medical SchoolHannoverGermany
  2. 2.Laboratory for Biomechanics and Biomaterials, Department of Orthopaedic SurgeryHannover Medical SchoolHannoverGermany
  3. 3.Centre for Hip, Knee and Foot Surgery, Sports TraumatologyATOS HospitalHeidelbergGermany

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