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Related Experiment Videos

The initial stability of uncemented acetabular components.

M J Curtis1, R H Jinnah, V D Wilson

  • 1Johns Hopkins University, Baltimore, Maryland.

The Journal of Bone and Joint Surgery. British Volume
|May 1, 1992
PubMed
Summary

Optimal initial stability for uncemented acetabular component fixation is achieved with specific under-reaming. Using a 2 mm or 3 mm larger implant than the reamer provides superior torsional stability in hip replacement surgery.

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Engineering
  • Biomechanics

Background:

  • Osseointegration of uncemented acetabular components is crucial for long-term hip implant survival.
  • Initial implant stability, often achieved through acetabular under-reaming, is a key factor for successful osseointegration.

Purpose of the Study:

  • To evaluate the effect of different acetabular under-reaming depths on the torsional stability of porous-coated hemispherical prostheses.
  • To determine the optimal interference fit for uncemented acetabular component fixation.

Main Methods:

  • Cadaveric acetabula were prepared with 52 mm porous-coated hemispherical prostheses using under-reaming of 1, 2, 3, and 4 mm.
  • Torsional stability was assessed by measuring the torque required to induce 1 and 2 degrees of rotation after applying a 686 N preload.

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  • Statistical analysis was performed to compare fixation between different under-reaming groups.

    • Main Results:

    • Under-reaming by 2 mm and 3 mm resulted in significantly greater torsional stability compared to 1 mm under-reaming (p<0.01, p<0.02).
    • Under-reaming by 4 mm led to acetabular fractures in some specimens, indicating excessive interference.
    • Optimal fixation was observed with 2 mm and 3 mm under-reaming, providing a robust interference fit.

    Conclusions:

    • Acetabular under-reaming of 2 mm or 3 mm significantly enhances the initial torsional stability of uncemented porous-coated acetabular components.
    • A 2 mm or 3 mm difference between the implant size and the final reamer size is recommended for achieving maximum interference fit and optimal implant stability.
    • Careful consideration of under-reaming depth is essential to avoid implant failure due to acetabular fracture.