A novel approach to measure variability in the anterior cruciate ligament deficient knee during walking: the use of the approximate entropy in orthopaedics

Journal of Clinical Monitoring and Computing
A D GeorgoulisN Stergiou

Abstract

The evaluation of variability of biological rhythmic activities through measures such as Approximate Entropy (ApEn) has provided important information regarding pathology in disciplines such as cardiology and neurology. This research lead to the "loss of complexity hypothesis" where decreased variability is associated with loss of healthy flexibility rendering the system more rigid and unable to adapt to stresses. ApEn as a measure of variability and complexity, correlates well with pathology while, in some cases, it is predictive of subsequent clinical changes. The study of human gait could benefit from the application of ApEn since it is also a rhythmical oscillation. Our aim was to assess the variability of the ACL deficient knee, since ACL rupture is a common musculoskeletal injury and is accompanied by altered gait patterns and future pathology in the joint. We hypothesized that the ACL deficient knee will exhibit more regular and less variable walking patterns than the contralateral intact knee. Ten subjects with unilateral deficiency walked on a treadmill at their self-selected speed, 20% faster, and 20% slower, while kinematics were collected (50 Hz) from 80 consecutive strides for each condition. The ApEn of the result...Continue Reading

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Citations

Sep 11, 2007·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Constantina MoraitiAnastasios D Georgoulis
Mar 30, 2011·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Leslie M DeckerAnastasios D Georgoulis
Jul 13, 2011·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Mátyás O MagyarRita M Kiss
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