Design of a knee rotatory kinaesthetic device (original) (raw)
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A new technique for measuring the rotational axis pathway of a moving knee
The Knee, 1998
The current lack of objective tests to measure the instability of a moving knee means that the effectiveness of an anterior Ž. cruciate ligament ACL reconstruction cannot be accurately determined. This article describes a new technique for measuring the rotational axis pathway of a moving knee. It shows how this can be used to detect ACL deficiency and discusses how such measurements may be used to quantify dynamic instability. The article reports the results of a pilot study on 14 patients with unilateral symptomatic ACL deficiency. Subjects had their rotational axis pathways measured in both normal and unstable knees. On comparison, the unstable knee showed a consistent difference relative to the normal knee in all cases.
Knee kinematics of ACL-deficient patients: A development of a portable motion analysis system
Journal of Human Sport and Exercise
This study is to compare the knee kinematic measurements between the novel portable skin marker-based motion analysis system (Opti-Knee®) and a conventional system (Vicon®). Nineteen subjects were recruited and asked to perform stair descent with lower limb placed with skin markers. Knee kinematic data was computed from the trajectories of the skin markers. Pearson's correlation coefficient and Root-mean-square deviation (RMSD) were used to analyse the data. For the waveform, sagittal plane rotation is strongly positive correlated between systems, while for axial and coronal plane rotation, it was moderately to strongly positive correlated in both normal (ACLN) and ACL-deficient (ACLD) group. Substantial difference between two groups was found in correlation of abduction/adduction in both stance and swing phase, as well as in external/internal rotation in all selected regions of interest. Moreover, the RMSD was larger in ACLN than in ACLD in three planes of rotation. The capability of Opti-Knee® in tracking lower limb sagittal plane rotation was comparable to Vicon®. However, for coronal and axial plane rotation, although the correlation to Vicon® in kinematic waveforms was moderately high, their ROM and peak values substantially deviated from the values in Vicon®.
Measurements of knee rotation-reliability of an external device in vivo
BMC Musculoskeletal Disorders, 2011
Background: Knee rotation plays an important part in knee kinematics during weight-bearing activities. An external device for measuring knee rotation (the Rottometer) has previously been evaluated for validity by simultaneous measurements of skeletal movements with Roentgen Stereometric Analysis (RSA). The aim of this study was to investigate the reliability of the device.
Orthopaedic journal of sports medicine, 2014
Methods of objectively measuring rotational knee laxity are either experimental or difficult to use in daily practice. A new method has been developed to quantitatively assess rotatory laxity using an open MRI system and new tool, the KneeM device. To perform a preliminary evaluation of a novel knee rotation measurement device to assess knee kinematics during flexion in an MRI field, in both anterior cruciate ligament (ACL)-deficient and healthy contralateral knees. The hypothesis was that the KneeM device would allow in vivo reproduction and analysis of knee kinematics during flexion in healthy and ACL-deficient knees. Controlled laboratory study. Ten subjects (7 men and 3 women; mean age ± standard deviation, 32.3 ± 9.4 years) with ACL-deficient knees and contralateral uninjured knees participated in the study. An open MRI was performed with the KneeM device at a mean 4.9 months (range, 3.0-7 months) after ACL injury. The device exerted on the knee an anterior drawer force of 100 ...
Techniques of proprioceptive evaluation of the anterior cruciate knee ligament
Acta Fisiátrica
The increasing interest in sports activities, combined with the knee’s anatomical vulnerability and complexity, justifies the increasing number of patients with ligament injuries, especially the anterior cruciate ligament (ACL). What then would be the best way to evaluate the knee proprioception? The objective of this study was to identify the techniques of proprioceptive evaluation of the anterior cruciate knee ligament (ACL), and to determine whether a better technique is available. The method was to review the literature, including only those studies published in indexed scientific journals that referred to evaluation tools and/or knee proprioception measurement. The discussion of the different methods of evaluating ACL proprioception, according to the literature, included: morphological anatomical studies; neurophysiologic evaluation, and clinical evaluation which was divided into three types: a) sense of static position; b) kinesthetic posture; and c) postural balance. Although...
Journal of Modern Rehabilitation, 2023
In addition to the instability of the knee joint, injury to the anterior cruciate ligament (ACL) leads to a functional deficit in the form of diminished proprioception of the knee joint. The purpose of this study was to compare knee proprioception in athletes with an ACL injury and healthy athletes. Materials and Methods: The participants in this cross-sectional study were 26 athletes with an ACL injury and 24 healthy athletes who were selected from the orthopedic clinic at Baqiyatallah Hospital in 2019, Tehran City, Iran. Cooper or non-Cooper subjects with ACL injury were identified via the knee injury and osteoarthritis outcome score (KOOS). The knee proprioception of all participants was recorded using a system consisting of digital photography, non-reflective markers, and Digimizer software. Results: The results showed that there was no significant difference between groups in the absolute error of knee joint reconstruction at both 45° and 90° angles. Conclusion: The data of the study showed that in comparison with healthy athletes, the knee joint proprioception of athletes with an ACL injury is not different and has the same function.
Validation of a Device to Measure Knee Joint Angles for a Dynamic Movement
2020
Participation in sports has risen in the United States over the last few years, increasing the risk of injuries such as tears to the anterior cruciate ligament (ACL) in the knee. Previous studies have shown a correlation between knee kinematics when landing from a jump and this injury. The purpose of this study was to validate the ability of a commercially available inertial measurement units (IMUs) to accurately measure knee joint angles during a dynamic movement. Eight healthy subjects participated in the study. Validation was performed by comparing the angles measured by the wearable device to those obtained through the gold standard motion capture system when landing from a jump. Root mean square, linear regression analysis, and Bland–Altman plots were performed/constructed. The mean difference between the wearable device and the motion capture data was 8.4° (flexion/extension), 4.9° (ab/adduction), and 3.9° (rotation). In addition, the device was more accurate at smaller knee a...
The American Journal of Sports Medicine, 2009
Background: Studies assessing proprioceptive acuity in anterior cruciate ligament (ACL)-deficient knees have only considered proprioception for knee movements in the sagittal plane rather than in the transverse plane (ie, rotation), despite the fact that the ACL plays a critical role in knee rotational stability and that the ACL is injured almost exclusively with a rotation mechanism. Therefore a test of proprioception is needed that involves movements similar to the mechanism of injury, in this case, rotation.