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Reduction in cement-bone interface shear strength between primary and revision arthroplasty
Y Dohmae1, J E Bechtold, R E Sherman
1Department of Orthopaedic Surgery, Metropolitan Medical Center, Minnesota.
Clinical Orthopaedics and Related Research
|November 1, 1988
Summary
Revision hip arthroplasty cement-bone interface shear strength significantly decreases with each subsequent surgery. First revisions showed a 79.4% strength reduction, and second revisions dropped to 6.8% of primary strength.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
- Biomechanics
Background:
- Revision hip arthroplasty is a common procedure.
- The cement-bone interface is critical for implant stability.
- Understanding strength changes in revision cases is crucial.
Purpose of the Study:
- To quantify cement-bone interface shear strength in primary, first-revision, and second-revision hip arthroplasties.
- To assess the impact of mechanical interlock on interface strength.
- To establish strength reduction percentages for revision scenarios.
Main Methods:
- 128 femoral segments from human femora were used.
- Specimens were prepared for primary, first, and second revisions.
- Cement was pressurized, and interface shear strength was measured.
Main Results:
- First-revision interface shear strength was 20.6% of primary strength.
- Second-revision interface shear strength was 6.8% of primary strength.
- Significant strength reduction occurred with each revision.
Conclusions:
- Cement-bone interface strength markedly decreases with each revision surgery.
- Mechanical interlock is a key factor in maintaining interface strength.
- Revision arthroplasty requires careful consideration of bone-cement interface integrity.