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. 2019 May;27(5):1477-1486.
doi: 10.1007/s00167-018-5099-8. Epub 2018 Aug 14.

The negative effect of joint line elevation after total knee arthroplasty on outcome

Willem A M van Lieshout  1   2 , Kars P Valkering  3 , Koen L M Koenraadt  4 , Faridi S van Etten-Jamaludin  5 , Gino M M J Kerkhoffs  6 , Rutger C I van Geenen  7
Affiliations

The negative effect of joint line elevation after total knee arthroplasty on outcome

Willem A M van Lieshout et al. Knee Surg Sports Traumatol Arthrosc. 2019 May.

Abstract

Purpose: Total knee arthroplasty (TKA) is widely used as a treatment for knee osteoarthritis. However, still up to 20% of the patients are dissatisfied. Joint line elevation after TKA might be a contributing factor as it alters knee kinematics. The aim of this study was to investigate the effect of joint line elevation on outcome.

Methods: A systematic review of the literature was performed to select studies that reported on joint line alterations after primary or revision TKA and outcome. Studies with comparable outcome parameters were included in a correlation analysis.

Results: In total, 396 studies were identified, of which 27 met the inclusion criteria. 8 studies could be included in the correlation analysis. Mean joint line elevation after primary TKA was 3.0 mm and after revision TKA this was 3.6 mm. A statistically significant negative correlation was found between joint line elevation and the postoperative Knee Society Score (KSS) function score (ρ = - 0.496, p < 0.001). In a pooled analysis, the maintained joint line revision TKA group had statistically significant better postoperative KSS total scores compared to an elevated joint line group (p < 0.001).

Conclusion: In this systematic review, a negative correlation between joint line elevation and outcome was found. Furthermore, revision TKAs with a maintained joint line have statistically significant better postoperative KSS scores compared to an elevated joint line group. To achieve optimal outcome after TKA, restoration of the joint line is one of the parameters that should be pursued and introduced elevation should not exceed 4 mm.

Level of evidence: IV.

Keywords: Correlation analysis; Joint line; Outcome; Revision total knee arthroplasty; Systematic review; Total knee arthroplasty.

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Conflict of interest statement

No competing interests to declare.

Figures

Fig. 1
Fig. 1
Flowchart systematic review
Fig. 2
Fig. 2
Correlation analysis of KSS function versus joint line alteration in primary TKA
Fig. 3
Fig. 3
Correlation analysis of KSS total versus joint line alteration in primary TKA
Fig. 4
Fig. 4
Correlation analysis of KSS knee versus joint line alteration in primary TKA
See this image and copyright information in PMC

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