Mobile-bearing total knee arthroplasty: More rotation is evident during more demanding tasks

A.W. Zurcher, K.U. van Hutten, J. Harlaar, C.B. Terwee, G.H.R. Albers, R.G. Poll

    Research output: Contribution to JournalArticleAcademicpeer-review


    Background: Some reports showed few but significant more axial femorotibial rotation in favor of mobile-bearing (MB) versus fixed-bearing (FB) total knee arthroplasty (TKA), mostly during knee bend fluoroscopic studies. The goal of the current study was to submit MB and FB groups of TKA patients to a turning activity, in which additional rotation was to be expected. Methods: Two consecutive cohorts of patients after TKA (10 FB and 11 MB knees in a total of 18 patients) were assessed using motion analysis five year postoperatively, while performing gait and sit-to-walk (STW) movements with and without turning steps. Results: Mean range of rotation in the FB group increased from 9.7° during gait, to 11.7° during STW straight, and to 14.3° during STW turning. Mean range of rotation in the MB group increased from 13.4° during gait to 21.0° during STW straight, and stayed at 21.1° during STW turning. Conclusions: Too many uncontrolled variables in the current study hinder a meaningful discrimination of MB from FB TKA rotation. However, the study does illustrate how more demanding task loads could be helpful in exploring the geometric constraints of TKA variants. Level of Evidence: Level III, therapeutic study.
    Original languageEnglish
    Pages (from-to)960-963
    JournalThe Knee
    Issue number5
    Publication statusPublished - 2014


    Dive into the research topics of 'Mobile-bearing total knee arthroplasty: More rotation is evident during more demanding tasks'. Together they form a unique fingerprint.

    Cite this