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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Acknowledgments
The authors are very grateful to Professor Tiit Haviko, Dr. Aare Märtson and physiotherapist Galina Schneider for their contribution to subject’s operative treatment and postoperative rehabilitation. We are also indebted to Herje Aibast and Monika Rätsepsoo for their assistance with data collection. We acknowledge that this study was partly supported by the Estonian Ministry of Education and Research project No. SF0180030s07 and Estonian Science Foundation project No 7939.
Conflict of interest
The authors confirm that there are no potential conflicts of interest including any personal or other relationships with other people or organizations associated with the work submitted that could inappropriately influence their work.
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Vahtrik, D., Ereline, J., Gapeyeva, H. et al. Postural stability in relation to anthropometric and functional characteristics in women with knee osteoarthritis following total knee arthroplasty. Arch Orthop Trauma Surg 134, 685–692 (2014). https://doi.org/10.1007/s00402-014-1940-9
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DOI: https://doi.org/10.1007/s00402-014-1940-9