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Micromotions and Strains of Cementless Femoral Prostheses

  • Yasuhiro Okumura
  • Shinichi Imura
  • Hironori Oomori
  • Kouzou Ichihashi
  • Hideyuki Takedani

Summary

Using cadaver femurs, strains on the femoral surface and micromotions between stem and bone were measured.

Stress shielding in the proximal medial region after stem insertion was apt to be stronger with a collarless stem than with a collared stem.

It was considered important to obtain a close proximal fit in order to minimize micromotion in the proximal region of the stem. Distal fixation, however, did not exert any influence on micromotion in the proximal region. With a collared stem, micromotion in the proximal region was largest in proximal-loose and distal-fit. The collarless stem had generally smaller micromotion regardless of proximal and distal fixation. Therefore, it was considered more favorable to use a collarless stem to obtain proximal fixation of the stem.

Key words

Total hip arthroplasty Femoral stem prostheses Strain distribution Micromotion measurement 

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References

  1. 1.
    Oh I, Harris WH (1978) Proximal strain distribution in the loaded femur. J Bone Joint Surg [Am] 60: 75–85Google Scholar
  2. 2.
    Walker PS, Schneeweis D, Murphy S, Nelson P (1987) Strain and micromotion of press-fit femoral stem prostheses. J Biomech 20: 693–702PubMedCrossRefGoogle Scholar
  3. 3.
    Whiteside LA, Easley JC (1989) The effect of collar and distal stem fixation on micromotion of the femoral stem in uncemented total hip arthroplasty. Clin Orthop, 239: 145–153PubMedGoogle Scholar

Copyright information

© Springer-Verlag Tokyo 1992

Authors and Affiliations

  • Yasuhiro Okumura
  • Shinichi Imura
  • Hironori Oomori
  • Kouzou Ichihashi
  • Hideyuki Takedani
    • 1
  1. 1.Department of Orthopaedic SurgeryFukui Medical SchoolFukuiJapan

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