Reliability of Center of Pressure measures of Postural Stability in Anterior Cruciate Ligament Reconstructed Athletes: Effect of Vibration and Cognitive Load

Document Type : RESEARCH PAPER

Authors

1 Department of Physical Therapy, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran

2 Department of Physical Therapy, School of Rehabilitation Sciences, Tehran University of Medical Sciences, Tehran, Iran

3 Akhtar Hospital, Shahid Beheshti University of Medical Science, Tehran, Iran

4 Rehabilitation Research Center, Iran University of Medical Science, Tehran, Iran

Abstract

Background: To evaluate intra and intersession reliability of the Center of Pressure (COP) parameters in Anterior
Cruciate Ligament Reconstructed (ACLR) athletes with and without ankle vibration using a dual-task paradigm.
Methods: Postural sway of 14 ACLR individuals was assessed during a single-leg stance on a force platform. COP
parameters were assessed with manipulating sensory inputs via vision and ankle vibration under single and dual-task
conditions. The outcome variables included COP displacement in medial-lateral (ML) and anterior-posterior (AP) range,
mean velocity (mV), and area. During dual-task conditions, the auditory Stroop Task was applied. Intraclass correlation
coefficient (ICC) values and standard error of measurement (SEM) were assessed for relative and absolute reliability.
Results: The COP measures had moderate to very high intrasession reliability (ICC range: 0.51-0.93) for conditions
with vibration and cognitive task, with the highest ICCs for mV and the lowest for area, regardless of eyes being open
or closed. The intersession reliability was moderate to high for mV (ICC range: 0.60-0.82) and little to very high (ICC
range: 0.21-0.97) for the range of ML and AP, as well as an area in conditions with vibration and cognitive task.
Conclusion: The mV is the most reliable COP parameter for assessing postural control under ankle vibration and dualtask
conditions for both operated and non-operated sides. During closed-eye conditions, the application of vibration
affected the intersession reliability with decreased ICCs on the operated side and increased ICCs on the non-operated
side.
Level of evidence: III

Keywords

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The Archives of Bone and Joint Surgery
Volume 10, Issue 2
February 2022
Pages 171-182

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History

  • Receive Date: 11 December 2020
  • Revise Date: 23 April 2021
  • Accept Date: 02 June 2021

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