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Archives of Orthopaedic and Trauma Surgery
Published in: Archives of Orthopaedic and Trauma Surgery 5/2014

01-05-2014 | Knee Arthroplasty

Postural stability in relation to anthropometric and functional characteristics in women with knee osteoarthritis following total knee arthroplasty

Authors: Doris Vahtrik, Jaan Ereline, Helena Gapeyeva, Mati Pääsuke

Published in: Archives of Orthopaedic and Trauma Surgery | Issue 5/2014

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Abstract

Introduction

Due to the controversial information about postural stability in patients with lower limb joints osteoarthritis (OA), the following main questions are raised: how serious is the postural stability disturbance and which factors have an impact on postural stability before and after total knee arthroplasty (TKA).

Materials and methods

Force plate was used to assess postural stability and custom-made dynamometer was used to assess isometric maximal voluntary contraction (MVC) force of leg extensor muscles; besides, knee pain and knee range of motion (ROM) was evaluated in 14 female patients (aged 46–68 years) with knee OA 1 day before, and 3 and 6 months following TKA and once in healthy controls (aged 48–70). Relationship between postural stability during standing and selected anthropometric and functional characteristics were investigated with Spearman’s correlation coefficients.

Results

Remarkable reduction of knee pain and improvement in active ROM for the operated leg were shown after unilateral TKA. MVC force of leg extensor muscles achieved the preoperative level half a year after TKA. The centre of pressure (COP) of sway displacement in anterioposterior (AP) and mediolateral direction and the equivalent area of COP sway for the operated leg did not differ before, 3 and 6 months after TKA and compared to the non-operated leg. The trace speed was 6 months after TKA equal to the preoperative level. Only the COP of sway displacement in AP direction is significantly greater in knee OA patients both before and after TKA compared with healthy controls.

Conclusions

Knee OA patients’ postural stability characteristics did not differ significantly both before and after TKA. Compared to healthy controls, the COP of sway displacement in AP direction is mostly disturbed. Correlation analysis confirms that increased postural sway is associated with an increased equivalent area of COP. In knee OA patients higher body mass index ensures reduced trace speed and lower knee ROM.

Level of evidence

Prospective comparative study, Level II.
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Metadata
Title
Postural stability in relation to anthropometric and functional characteristics in women with knee osteoarthritis following total knee arthroplasty
Authors
Doris Vahtrik
Jaan Ereline
Helena Gapeyeva
Mati Pääsuke
Publication date
01-05-2014
Publisher
Springer Berlin Heidelberg
Published in
Archives of Orthopaedic and Trauma Surgery / Issue 5/2014
Print ISSN: 0936-8051
Electronic ISSN: 1434-3916
DOI
https://doi.org/10.1007/s00402-014-1940-9

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