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Related Experiment Videos

Femoral component offset. Its effect on strain in bone-cement

J R Davey1, D O O'Connor, D W Burke

  • 1Orthopaedic Biomechanics Laboratory, Massachusetts General Hospital, Boston 02114.

The Journal of Arthroplasty
|February 1, 1993
PubMed
Summary

Increasing femoral component offset in total hip arthroplasty reduces hip joint forces. This study found no significant increase in cement mantle strain, suggesting a favorable biomechanical outcome for this surgical adjustment.

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Biomaterials science

Background:

  • Femoral component offset significantly impacts hip biomechanics after total hip arthroplasty.
  • Increased offset enhances abductor muscle leverage, potentially reducing joint forces.
  • Conversely, increased offset may elevate implant bending moments and cement mantle strain.

Purpose of the Study:

  • To investigate the biomechanical effects of varying femoral component offset on hip joint mechanics and cement mantle strain.
  • To evaluate the trade-offs between reduced joint forces and potential increased cement strain with greater femoral offset.

Main Methods:

  • In vitro study using cadaver femora.
  • Cementation of femoral prostheses with varying offset levels.

Related Experiment Videos

  • Quantification of abductor force, resultant hip force, and cement mantle strain under simulated single limb stance loading.

    • Main Results:

    • Substantial reductions in both abductor and resultant hip joint forces were observed with increased femoral component offset.
    • No significant increase in strain was detected in the proximal medial portion of the cement mantle across different offset levels.

    Conclusions:

    • Increased femoral component offset in total hip arthroplasty offers biomechanical advantages by reducing hip joint and abductor forces.
    • The observed increase in offset does not appear to compromise the integrity of the proximal medial cement mantle.
    • These findings support the use of increased femoral offset for improved hip mechanics without compromising cement fixation.