Backside wear in total knee replacement: A new quantitative measurement method and a comparison of polished cobalt-chromium tibial trays with titanium tibial trays

Braun, Simone; Uhler, Maximilian; Bormann, Therese; Schroeder, Stefan; Jaeger, Sebastian; Sonntag, Robert; Kretzer, Jan Philippe

doi:10.1016/j.wear.2020.203552

Cited by 5 publications

(1 citation statement)

References 41 publications

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“…2 Multiple retrieval analysis studies of modular fixed-bearing PE inlays with different locking mechanisms in TKA have provided evidence of PE wear debris on both the articular and backside surface. [2][3][4][5] The suggested mechanism of backside wear is micromotion between the PE inlay and the tibial baseplate, 1,3 which may be the result of an insufficient locking mechanism for the PE inlay. To our knowledge, PE inlay micromotion of TKA has not previously been assessed in vivo.…”

Section: Introductionmentioning

confidence: 99%

Stable polyethylene inlay fixation and low polyethylene wear rate in fixed-bearing total knee arthroplasty at five to six years’ follow-up

Jürgens-Lahnstein,

Petersen,

Rytter

et al. 2024

Bone Joint Res

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AimsMicromotion 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.MethodsA 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.ResultsAt 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).ConclusionThe 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.Cite this article: Bone Joint Res 2024;13(5):226–236.

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