Abstract
Purpose
Only few long-term data on ligament-balanced cruciate-retaining total knee arthroplasty (CR TKA) are currently available. Either a mobile- or fixed-bearing insert can be chosen, which showed good mid-term outcome and few complications and revisions. This multi-centre retrospective cross-sectional cohort study investigated the 12-year results of primary TKA using a balancing gap technique and compared survival and clinical outcome between fixed and mobile inserts.
Methods
In this retrospective cross-sectional cohort study, 557 cases of three clinics (2 Swiss, 1 Dutch) operated between 1998 and 2003 with the first series of a TKA implanted with a balanced gap technique (433 (77.7%) fixed, 124 (22.3%) mobile (anterior–posterior gliding (7–9 mm) and rotational (15°) degrees of freedom) inserts) were included for survival analysis (Kaplan–Meier, by insert type). At the 12-year follow-up (FU) examination of 189 cases, range of motion, knee society score (KSS), numeric rating scale (NRS) for pain and satisfaction were determined and radiographs were evaluated by median tests, by insert type.
Results
Of 521 cases available for analysis, 28 (5.4%; 11 fixed, 17 mobile bearing) were revised. Mean cumulative survival after 12.4 years was 97.0% (95% CI 94.7–98.4) for fixed bearings and 85.4% (95% CI 77.5–90.7) after 12.2 years for mobile bearings, p < 0.0001. Patients’ mean age at 11.0 years FU (n = 189) was 78.0 (range 54.5–97.3) years. Mean total KSS was 157.8 (24–200) points, and mean passive flexion was 114° (45–150); no clinical score differed significantly between fixed and mobile bearings.
Conclusion
This study showed a superior survival for fixed bearing compared with mobile bearing in a CR TKA using a ligament-balanced technique after more than 12 years. Clinical outcomes are excellent to good after long-term follow-up, and similar for fixed and mobile bearing.
Level of evidence
Therapeutic studies—retrospective cohort study, Level III.
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Authors’ contributions
PH participated in the design of the study, performed the statistical analysis and drafted the manuscript. AvH and JK carried out the follow-up of the patients and helped to draft the manuscript. HE, BC, AW, and AS conceived of the study and participated in its design and coordination. All authors read and approved the final manuscript.
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The institutions of the authors received a research grant from Mathys Ltd for performing the study. Mathys Ltd had no role in the conduct, analysis and presentation of the results.
Funding
This study was partly funded by Mathys Ltd (Institutional research grant).
Ethical approval
All procedures performed in our study were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the study.
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Heesterbeek, P.J.C., van Houten, A.H., Klenk, J.S. et al. Superior long-term survival for fixed bearing compared with mobile bearing in ligament-balanced total knee arthroplasty. Knee Surg Sports Traumatol Arthrosc 26, 1524–1531 (2018). https://doi.org/10.1007/s00167-017-4542-6
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DOI: https://doi.org/10.1007/s00167-017-4542-6