“Backside” polyethylene deformation in total knee arthroplasty

The clinical importance of polyethylene deformation between the tibial insert and base plate (“backside”) is unclear. We used a semiquantitative scoring system to compare clinical and radiographic factors with articular and backside deformation of 106 retrieved polyethylene tibial inserts. Backside...

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Bibliographic Details
Published in:The Journal of arthroplasty 2003-09, Vol.18 (6), p.784-791
Main Authors: Akisue, Toshihiro, Yamaguchi, Motoi, Bauer, Thomas W, Takikawa, Satoshi, Schils, Jean P, Yoshiya, Shinichi, Kurosaka, Masahiro
Format: Article
Language:English
Subjects:
Adult
Aged
Analysis of Variance
Arthroplasty, Replacement, Knee
Chi-Square Distribution
Female
Humans
Knee Prosthesis
Male
Middle Aged
osteolysis
Osteolysis - etiology
polyethylene
Polyethylenes
Prosthesis Design
Prosthesis Failure
Registries
retrieved implants
Stress, Mechanical
Surface Properties
total knee arthroplasty
wear
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Summary:The clinical importance of polyethylene deformation between the tibial insert and base plate (“backside”) is unclear. We used a semiquantitative scoring system to compare clinical and radiographic factors with articular and backside deformation of 106 retrieved polyethylene tibial inserts. Backside deformation was associated with polyethylene thickness and type of locking mechanism. Deformation of the articular surface correlated with femoral osteolysis ( P=.05). The mean backside deformation score was 33% greater for implants from patients with osteolysis than for implants from patients without osteolysis ( P=.07). Our study may be biased based on the types of implants available for study, but for this group of implants, we cannot conclude with 95% certainty that backside polyethylene deformation was clinically important as a cause of periprosthetic osteolysis or implant loosening.
ISSN:0883-5403
1532-8406
DOI:10.1016/S0883-5403(03)00255-9