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Antioxidant-stabilized highly crosslinked polyethylene in total knee arthroplasty: a retrieval analysis
D Y Ponzio1, L Weitzler1, A deMeireles1
1Hospital for Special Surgery, New York, USA.
The Bone & Joint Journal
|October 9, 2018
Summary
Antioxidant-stabilized highly crosslinked polyethylene (A-XLPE) tibial inserts showed similar short-term performance to standard highly crosslinked polyethylene (XLPE) in total knee arthroplasty (TKA), with no significant differences in crosslinking or oxidation in loaded areas.
Area of Science:
- Biomaterials Science
- Orthopedic Surgery
- Materials Engineering
Background:
- Total knee arthroplasty (TKA) relies on durable polyethylene (PE) tibial inserts.
- Highly crosslinked polyethylene (XLPE) offers improved wear resistance over conventional PE.
- Antioxidant-stabilization (A-XLPE) is a newer modification aimed at further enhancing PE longevity.
Purpose of the Study:
- To evaluate and compare surface damage, crosslinking density, and oxidation levels between retrieved A-XLPE and standard XLPE tibial inserts from TKAs.
- To assess the short-term clinical performance and material integrity of A-XLPE in a retrieved setting.
Main Methods:
- Retrieval analysis of 19 A-XLPE and 18 matched XLPE tibial inserts after a mean implantation of 15 months.
- Quantification of surface damage (burnishing, pitting, scratching) and measurement of crosslinking density and oxidation indices in loaded and unloaded regions.
Main Results:
- A-XLPE inserts exhibited higher rates of burnishing but lower rates of pitting and scratching compared to XLPE.
- No significant differences were observed in crosslinking density between A-XLPE and XLPE.
- A-XLPE showed increased oxidation in unloaded regions, but comparable oxidation levels in loaded regions.
Conclusions:
- Short-term retrieval analysis indicates that A-XLPE tibial inserts do not demonstrate clinically relevant differences in surface damage, crosslinking, or oxidation compared to standard XLPE.
- Further long-term studies are warranted to fully ascertain the clinical benefits of antioxidant stabilization in TKA polyethylene inserts.
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