Component positioning and ceramic damage in cementless ceramic-on-ceramic total hip arthroplasty
Francesco Castagnini1, Giordano Valente2, Gianluigi Crimi2
1Ortopedia-Traumatologia e Chirurgia Protesica e dei reimpianti d'anca e di ginocchio, IRCCS Istituto Ortopedico Rizzoli, Via Pupilli 1, Bologna, 40136, Italy.
Summary
High cup abduction and extreme combined version in ceramic-on-ceramic total hip arthroplasty (CoC THA) significantly correlate with ceramic damage. Avoiding cup inclination over 45° is crucial for better outcomes.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
- Medical Imaging
Background:
- Ceramic-on-ceramic total hip arthroplasty (CoC THA) component positioning impacts bearing damage.
- Long-term clinical outcome correlations with positioning angles are not well-established.
- Understanding these relationships is vital for improving implant longevity.
Purpose of the Study:
- To assess component positioning in CoC THAs using computed tomography (CT).
- To analyze the correlation between component positioning and ceramic damage.
- To identify potential "safe zones" for component placement.
Main Methods:
- Evaluated 91 post-operative CT scans of CoC THAs with a mean 12-year follow-up.
- Included third and fourth-generation CoC bearing surfaces.
- Automated angle measurements (cup abduction, anteversion, etc.) and assessed cup-neck position at various flexion angles.
- Diagnosed ceramic damage via synovial fluid analysis and radiological criteria.
Main Results:
- 63.7% of THAs had cup abduction within the 30°-45° target range.
- 68.1% had cup anteversion within the 5°-25° target range.
- 20.9% of patients exhibited ceramic damage, significantly correlated with high cup abduction and high cup-neck angles (indicating extreme combined version).
- Third-generation ceramic bearings, but not demographic factors, influenced results.
Conclusions:
- No definitive "safe zones" for component positioning were identified in CoC THA.
- High cup inclination (>45°) and extreme combined version should be avoided.
- Optimizing component positioning is essential to mitigate ceramic damage risk.
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