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Bone Joint J. 2018 Feb;100-B(2):170-175. doi: 10.1302/0301-620X.100B2.BJJ-2017-0428.R2.

Inducible displacement of cemented tibial components ten years after total knee arthroplasty.

Author information

1
Schulich School of Medicine and Dentistry, Western University, 1151 Richmond Street, London, Ontario N6A 5C1, Canada.
2
Schulich School of Medicine & Dentistry, Western University and London Health Sciences Centre.
3
Robarts Research Institute.
4
Schulich School of Medicine & Dentistry, Western University and London Health Sciences Centre, 1151 Richmond Street, London, Ontario N6A 5C1, Canada and Imaging Research Laboratories, Robarts Research Institute, 1151 Richmond Street, London, Ontario N6A 5C1, Canada and Surgical Innovation Program, Lawson Health Research Institute, 750 Base Line Rd East, London, Ontario N6C 2R5, Canada.

Abstract

AIMS:

The aim of this study was to evaluate the long-term inducible displacement of cemented tibial components ten years after total knee arthroplasty (TKA).

PATIENTS AND METHODS:

A total of 15 patients from a previously reported prospective trial of fixation using radiostereometric analysis (RSA) were examined at a mean of 11 years (10 to 11) postoperatively. Longitudinal supine RSA examinations were acquired at one week, one year, and two years postoperatively and at final follow-up. Weight-bearing RSA examinations were also undertaken with the operated lower limb in neutral and in maximum internal rotation positions. Maximum total point motion (MTPM) was calculated for the longitudinal and inducible displacement examinations (supine versus standing, standing versus internal rotation, and supine versus standing with internal rotation).

RESULTS:

All patients showed some inducible displacement. Two patients with radiolucent lines had greater mean standing-supine MTPM displacement (1.35; sd 0.38) compared with the remaining patients (0.68; sd 0.36). These two patients also had a greater mean longitudinal MTPM at ten years (0.64; sd 0.50) compared with the remaining patients (0.39; sd 0.13 mm).

CONCLUSION:

Small inducible displacements in well-fixed cemented tibial components were seen ten years postoperatively, of a similar magnitude to that which has been reported for well-fixed components one to two years postoperatively. Greater displacements were found in components with radiolucent lines. Cite this article: Bone Joint J 2018;100-B:170-5.

KEYWORDS:

Implant fixation; Radiostereometric analysis; Total knee arthroplasty

[Indexed for MEDLINE]

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