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dc.contributor.authorMohamed, Raisah
dc.contributor.otherQueen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.))en
dc.description.abstractResearchers have accurately quantified the Pivot-Shift Test of anterior cruciate ligament (ACL) injury over the past decade using navigation systems, electromagnetic sensors and inertial sensors. However, these tests have been conducted under anesthetic, which negate the contribution of muscular guarding from structures surrounding the knee that could make it difficult to generalize the measures for a pre-operative diagnosis. Therefore, the purpose of this study was to determine if the quantification of the Pivot-Shift Test differed between a non- anesthetized and anesthetized state (intra-operatively where no muscle activity is possible), and if the difference could be attributed to muscular guarding. To achieve this, 12 patients who had acquired a unilateral ACL-injury were tested on the day of their ACL reconstructive surgery. Acceleration and muscle activity were recorded over 10 consecutive Pivot-shift tests on their injured and uninjured knee pre-operatively and intra-operatively from 8 Delsys Trigno wireless EMG electrodes and 2 Delsys accelerometers. From the results, the slope of net tibial acceleration could differentiate between the injured and uninjured knee (mean difference, 2.14 g/s, p<0.05). Furthermore, the slope was larger in intra-operatively than in pre-operatively (mean difference, 1.92 g/s, p<0.05) indicating that a difference between conditions. Non- normalized semitendinosus muscle activity explained a proportion of the difference in slope between the pre-op and intra-op (b = 0.6, p<0.05), suggesting hamstring muscular guarding was at play. However, comparing muscle activity during the Pivot-Shift Test to the participant’s maximum voluntary isometric contraction (MVIC) produced results over 100%, suggesting that maximums were taken incorrectly. Thus, without normalizing, the generalizability of the muscular activity results is limited. Finally, no correlation between the slope and the clinical grade in either pre-op or intra-op was found. As a result, the objective quantification of the clinical grade was not possible. The lack of a correlation was speculated to be, in-part, due to the subjective grading scale that was the reference measurement for the grade of injury. Future research should consider changing the method by which MVICs are taken and the grade of injury should be based on diagnostic imaging.en_US
dc.relation.ispartofseriesCanadian thesesen
dc.rightsCC0 1.0 Universal*
dc.rightsQueen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canadaen
dc.rightsProQuest PhD and Master's Theses International Dissemination Agreementen
dc.rightsIntellectual Property Guidelines at Queen's Universityen
dc.rightsCopying and Preserving Your Thesisen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectACL Injuriesen_US
dc.subjectAnterior Cruciate Ligamenten_US
dc.subjectPivot-Shift Testen_US
dc.titleQuantitative Assessment of the Pivot-Shift Test in an Awake and an Asleep Stateen_US
dc.description.degreeMaster of Scienceen_US
dc.contributor.supervisorCostigan, Patrick
dc.contributor.departmentKinesiology and Health Studiesen_US

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Except where otherwise noted, this item's license is described as CC0 1.0 Universal