Skin-fixed scapula trackers: A comparison of two dynamic methods across a range of calibration positions

Prinold, Joe A.I.; Shaheen, Aliah F.; Bull, Anthony M.J.

doi:10.1016/j.jbiomech.2011.05.010

Cited by 52 publications

(64 citation statements)

References 20 publications

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“…It is possible to reduce the errors at higher arm elevation angles by performing the calibration of the anatomical landmarks with the arm elevated 32 . However, this increases the error at lower arm elevation angles.…”

Section: Discussionmentioning

confidence: 99%

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Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact

Warner

Chappell

Stokes

2015

JoVE

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The measurement of dynamic scapular kinematics is complex due to the sliding nature of the scapula beneath the skin surface. The aim of the study was to clearly describe the acromion marker cluster (AMC) method of determining scapular kinematics when using a passive marker motion capture system, with consideration for the sources of error which could affect the validity and reliability of measurements. The AMC method involves placing a cluster of markers over the posterior acromion, and through calibration of anatomical landmarks with respect to the marker cluster it is possible to obtain valid measurements of scapular kinematics. The reliability of the method was examined between two days in a group of 15 healthy individuals (aged 19-38 years, eight males) as they performed arm elevation, to 120°, and lowering in the frontal, scapular and sagittal planes. Results showed that between-day reliability was good for upward scapular rotation (Coefficient of Multiple Correlation; CMC = 0.92) and posterior tilt (CMC = 0.70) but fair for internal rotation (CMC = 0.53) during the arm elevation phase. The waveform error was lower for upward rotation (2.7° to 4.4°) and posterior tilt (1.3° to 2.8°), compared to internal rotation (5.4° to 7.3°). The reliability during the lowering phase was comparable to results observed during the elevation phase. If the protocol outlined in this study is adhered to, the AMC provides a reliable measurement of upward rotation and posterior tilt during the elevation and lowering phases of arm movement. Video LinkThe video component of this article can be found at

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Section: Discussionmentioning

confidence: 99%

“…The valid use of this method, however, depends on the ability to accurately apply the cluster of markers, the position of which has been shown to affect results 31 , calibrate anatomical landmarks 32 and ensuring arm movements are within a valid range of motion (i.e. below 120° arm elevation) 29 .…”

Section: Introductionmentioning

confidence: 99%

Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact

Warner

Chappell

Stokes

2015

JoVE

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“…Measurements of the scapular movement in the symptomatic shoulder were obtained using the method described by Shaheen et al (2011) [Shaheen et al, 2011b]. The scapula locator: a tripod device with three pegs on the scapula acromial angle, inferior angle and the root of the scapular spine was used to obtain the scapular measurements.…”

Section: Scapular Trackingmentioning

confidence: 99%

“…This is in part because of the difficulties involved in obtaining in-vivo measurements of the scapular movement [Hill et al, 2007, Kontaxis et al, 2009. Recently, a number of studies have developed methods to obtain scapular kinematics in-vivo with relatively high accuracies [Brochard et al, 2011, Prinold et al, 2011, Shaheen et al, 2011a, Shaheen et al, 2011b, Warner et al, 2012.…”

Section: Introductionmentioning

confidence: 99%

Rigid and Elastic taping changes scapular kinematics and pain in subjects with shoulder impingement syndrome; an experimental study

Shaheen¹,

Bull²,

Alexander³

2015

Journal of Electromyography and Kinesiology

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“…Although substantial work has been done in validating the accuracy of non-invasive, skin-based measurement methods of tracking the scapula (Lempereur et al, 2014), errors due to skin movement are still prevalent, especially in shoulder elevation above 90° (Borstad and Ludewig 2002;Ludewig et al, 2004;Prinold et al, 2011;van Andel et al, 2009;Warner et al, 2012). It has been suggested that modifying marker design in combination with adhering to current recommendations regarding attachment location of skin-based marker clusters placed over the scapula could improve the accuracy of this measurement method (Lempereur et al, 2014).…”

Section: Challenges In the Measurement Of Scapular Kinematicsmentioning

confidence: 99%

Refining scapulothoracic kinematic measurement and characterising scapulothoracic resting posture in those with and without chronic non-specific neck pain

Bet-Or¹

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Neck pain is a common and recurrent condition affecting between 30 to 50% of adults in any given year. People experiencing neck pain commonly report difficulties in performing activities involving the upper extremity. Furthermore, clinical trials that have included exercises that target the shoulder girdle have shown beneficial effects in reducing neck pain. These observations are feasible based on the biomechanical dependence of the cervical spine and shoulder girdle, which includes common muscle attachments. However, to date there has been a paucity of studies investigating underlying movement disorders of the shoulder girdle in people with neck pain. This is in part due to the challenges of kinematic measurement in this region. The aim of this thesis is to contribute to the literature concerning the role of the shoulder girdle and thorax complex in neck pain from three perspectives. First, the thesis has further refined and informed measurement methods of shoulder girdle and thoracic kinematics (Studies 1-3). Secondly, the thesis further defined normative kinematics of the region with a focus on upright resting posture (Study 4). Thirdly, the thesis explored differences in shoulder girdle and thoracic resting posture in upright standing in those with and without neck pain (Study 5).Advancement in knowledge concerning normal and impaired function of the shoulder girdle has been hindered by challenges related to 3D motion capture of the shoulder girdle and thorax due to skin movement and the complexity of measuring multiple joints and axes of rotation. Therefore, Study1 focused on refining and validating an acromion marker cluster (AMC) method to track scapular movement with the intent of minimising skin movement error. Although the findings of Study 1 indicated that the refined AMC design did not appear to lessen skin movement error compared to previous designs, it was found to be of comparable accuracy (max RMSE 4.45°) and reliability to previous designs (within-session test-retest ICC 0.79-0.99) and appropriate for use in the subsequent thesis studies. In Study 2 the reliability and validity of the AMC method was further evaluated in its capacity to track the scapula at end range clavicular movements (protraction/retraction, elevation/depression). Establishing its measurement accuracy and reliability (max RMSE 6.6°) in these common directions of scapula motion was necessary as it had been previously unstudied. While Studies 1 and 2 focused on optimising the measurement of scapulothoracic kinematics by ensuring the scapula could be tracked accurately, Study 3 focused on refining the measurement of the relationship between the shoulder girdle and the underlying thorax. This study compared thoracic and shoulder girdle postural relationships expressed in the external reference frame to that expressed in the traditionally used ISB recommended thorax reference frame. Using these different frames of iii reference Study 3 also compared measures of thoracic inclination and thoracic curvature. The findings sho...

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Skin-fixed scapula trackers: A comparison of two dynamic methods across a range of calibration positions

Cited by 52 publications

References 20 publications

Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact

Measurement of Dynamic Scapular Kinematics Using an Acromion Marker Cluster to Minimize Skin Movement Artifact

Rigid and Elastic taping changes scapular kinematics and pain in subjects with shoulder impingement syndrome; an experimental study

Refining scapulothoracic kinematic measurement and characterising scapulothoracic resting posture in those with and without chronic non-specific neck pain

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