Stable polyethylene inlay fixation and low polyethylene wear rate in fixed-bearing total knee arthroplasty at five to six years' follow-up.
Journal
Bone & joint research
ISSN: 2046-3758
Titre abrégé: Bone Joint Res
Pays: England
ID NLM: 101586057
Informations de publication
Date de publication:
09 May 2024
09 May 2024
Historique:
medline:
9
5
2024
pubmed:
9
5
2024
entrez:
8
5
2024
Statut:
epublish
Résumé
Micromotion of the polyethylene (PE) inlay may contribute to backside PE wear in addition to articulate wear of total knee arthroplasty (TKA). Using radiostereometric analysis (RSA) with tantalum beads in the PE inlay, we evaluated PE micromotion and its relationship to PE wear. A total of 23 patients with a mean age of 83 years (77 to 91), were available from a RSA study on cemented TKA with Maxim tibial components (Zimmer Biomet). PE inlay migration, PE wear, tibial component migration, and the anatomical knee axis were evaluated on weightbearing stereoradiographs. PE inlay wear was measured as the deepest penetration of the femoral component into the PE inlay. At mean six years' follow-up, the PE wear rate was 0.08 mm/year (95% confidence interval 0.06 to 0.09 mm/year). PE inlay external rotation was below the precision limit and did not influence PE wear. Varus knee alignment did not influence PE wear (p = 0.874), but increased tibial component total translation (p = 0.041). The PE inlay was well fixed and there was no relationship between PE stability and PE wear. The PE wear rate was low and similar in the medial and lateral compartments. Varus knee alignment did not influence PE wear.
Identifiants
pubmed: 38719208
doi: 10.1302/2046-3758.135.BJR-2023-0126.R1
pii: BJR-2023-0126.R1
doi:
Types de publication
Journal Article
Langues
eng
Pagination
226-236Informations de copyright
© 2024 Jürgens-Lahnstein et al.
Déclaration de conflit d'intérêts
The authors report funding for this study from the A. P. Møller Foundation, Zimmer Biomet, and the Danish Rheumatism Association. M. Stilling is also the unpaid President of the International RSA Society.
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