Publications
360 results found
Shaheen AF, Alexander CM, Bull AM, 2011, Tracking the scapula using the scapula locator with and without feedback from pressure-sensors: A comparative study, J Biomech., Vol: 44, Pages: 1633-1636
BACKGROUND: The scapula locator method has associated intra-observer and inter-observer errors caused by the dependency on the observer to locate the scapular landmarks. The potential effect of the pressures applied by the observer on the measured scapular kinematics when this method is used has also been overlooked so far. The aim of this study was to investigate the effect of using feedback on the pressures applied on the scapula using the locator on the intra-observer and inter-observer reliabilities of the method as well as on the kinematics obtained using this method. METHODS: Three observers tracked the scapular motion of the dominant shoulder of each subject using the locator with no reference to pressure-feedback for three trials of bilateral elevation in the scapular plane and using the locator with pressure-feedback for three other trials. Variations between the measurements obtained were used to calculate the intra-observer errors and variations between the measurements obtained by the three observers for the same subject were used to calculate inter-observer errors. Repeated-measures ANOVA tests were used to look at differences between the two methods in terms of intra-observer and inter-observer errors and scapular kinematics. FINDINGS: Using pressure-feedback reduced the intra-observer errors but had no effect on the inter-observer errors. Different scapular kinematics was measured using the two methods. INTERPRETATIONS: Pressure-feedback improves the reliability of the scapula locator method. Differences in the scapular kinematics suggest that unregulated pressures have an effect on the physiological scapular motion
Ramasamy A, Hill AM, Masouros S, et al., 2011, Blast-related fracture patterns: a forensic biomechanical approach, JOURNAL OF THE ROYAL SOCIETY INTERFACE, Vol: 8, Pages: 689-698, ISSN: 1742-5689
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- Citations: 54
Shaheen AF, Alexander CM, Bull AM, 2011, Effects of attachment position and shoulder orientation during calibration on the accuracy of the acromial tracker, J Biomech., Vol: 44, Pages: 1410-1413
The acromial tracker is used to measure scapular rotations during dynamic movements. The method has low accuracy in high elevations and is sensitive to its attachment location on the acromion. The aim of this study was to investigate the effect of the attachment position and shoulder orientation during calibration on the tracker accuracy. The tracker was attached to one of three positions: near the anterior edge of the acromion process, just above the acromial angle and the meeting point between the acromion and the scapular spine. The scapula locator was used to track the scapula during bilateral abduction simultaneously. The locator was used to calibrate the tracker at: no abduction, 30 degrees , 60 degrees , 90 degrees and 120 degrees humerothoracic abduction. ANOVA tests compared RMS errors for different attachment positions and calibration angles. The results showed that attaching the device at the meeting point between the acromion and the scapular spine gave the smallest errors and it was best to calibrate the device at 60 degrees for elevations </=90 degrees , at 120 degrees for elevations >90 degrees and at 90 degrees or 120 degrees for the full range of abduction. The accuracy of the tracker is significantly improved if attached appropriately and calibrated for the range of movement being measured
Murphy AJ, Bull AMJ, McGregor AH, 2011, Optimizing and validating an electromagnetic tracker in a human performance laboratory, PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE, Vol: 225, Pages: 343-351, ISSN: 0954-4119
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- Citations: 4
Amadi HO, Bull AMJ, 2011, Algorithm and validation of a computer method forquantifying attachment locus of glenohumeral ligament invivo, Computer Methods in Biomechanics and Biomedical Engineering, Vol: 14, Pages: 1059-1063, ISSN: 1025-5842
The aim of this work was to validate an algorithm that quantifies the locus ofglenohumeral ligaments (GHL) attachments on glenohumeral joint (GHJ)bones.A computed tomography scan of a GHJ was segmented to reconstruct thehumerus, scapula, anatomical neck (AN) and glenoid rim (GR) into 3-Dmeshes of interconnecting nodal-vectors. These were applied to construct a‘clock face’ coordinate system in which three o’clock points anteriorly.Based on the assigned clock face coordinate frame and the fitted plane, theerror between the fitted plane and the actual bony node were quantifiedthrough manual data extraction. This was tested on 50 specimens.Mean algorithm quantification errors for GHL attachments were 4.8mm (SD2.2mm) and 4.5mm (1.7mm) for the humerus and glenoid, respectively.Further studies would apply this to investigate GHL length changes duringfunction and may suggest how these structures should be handled duringsurgical repairs.
Ramasamy A, Masouros SD, Newell N, et al., 2011, In-vehicle extremity injuries from improvised explosive devices: current and future foci, PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, Vol: 366, Pages: 160-170, ISSN: 0962-8436
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- Citations: 59
Cleather DJ, Goodwin JE, Bull AMJ, 2011, An Optimization Approach to Inverse Dynamics Provides Insight as to the Function of the Biarticular Muscles During Vertical Jumping, ANNALS OF BIOMEDICAL ENGINEERING, Vol: 39, Pages: 147-160, ISSN: 0090-6964
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- Citations: 29
Clarke SG, Phillips ATM, Bull AMJ, 2011, Evaluating a suitable level of model complexity for finite element analysis of the intact acetabulum, Computational Methods in Biomechanics and Biomedical Engineering
Cleather DJ, Bull AMJ, 2011, Knee and hip joint forces - sensitivity to the degrees of freedom classification at the knee, PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE, Vol: 225, Pages: 621-626, ISSN: 0954-4119
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- Citations: 17
Murphy AJ, Bull AMJ, McGregor AH, 2011, Predicting the lumbosacral joint centre location from palpable anatomical landmarks, PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE, Vol: 225, Pages: 1078-1083, ISSN: 0954-4119
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- Citations: 6
Brown K, Bo C, Ramasamy A, et al., 2011, Prospects for studying how high-intensity compression waves cause damage in human blast injuries, 17th Biennial International Conference of the American Physical Society: Topical Group on Shock Compression of Condensed Matter
Alpay E, Ahearn AL, Bull AMJ, 2011, Promoting Cross-Departmental Initiatives for a Global Dimension in Engineering Education: the Imperial College Experience, European Journal of Engineering Education, Vol: 36, Pages: 225-242
Donoghue C, Rao A, Bull AMJ, et al., 2011, Manifold learning for automatically predicting articular cartilage morphology in the knee with data from the osteoarthritis initiative (OAI), Conference on Medical Imaging 2011 - Image Processing, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X
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- Citations: 2
Amadi HO, Bull AMJ, 2010, A motion-decomposition approach to address gimbal lock in the 3-cylinder open chain mechanism description of a joint coordinate system at the glenohumeral joint, Journal of Biomechanics, Vol: 43, Pages: 3232-3236, ISSN: 0021-9290
In this study, the standard-sequence properties of a joint coordinate system were implemented for the glenohumeral joint by the use of a set of instantaneous geometrical planes. These are: a plane that is bound by the humeral long axis and an orthogonal axis that is the cross product of the scapular anterior axis and this long axis, and a plane that is bounded by the long axis of the humerus and the cross product of the scapular lateral axis and this long axis. The relevant axes are updated after every decomposition of a motion component of a humeral position. Flexion, abduction and rotation are then implemented upon three of these axes and are applied in a step-wise uncoupling of an acquired humeral motion to extract the joint coordinate system angles. This technique was numerically applied to physiological kinematics data from the literature to convert them to the joint coordinate system and to visually reconstruct the motion on a set of glenohumeral bones for validation.
Cleather DJ, Bull AMJ, 2010, Influence of inverse dynamics methods on the calculation of inter-segmental moments in vertical jumping and weightlifting, BioMedical Engineering OnLine, Vol: 9, ISSN: 1475-925X
BackgroundA vast number of biomechanical studies have employed inverse dynamics methods to calculate inter-segmental moments during movement. Although all inverse dynamics methods are rooted in classical mechanics and thus theoretically the same, there exist a number of distinct computational methods. Recent research has demonstrated a key influence of the dynamics computation of the inverse dynamics method on the calculated moments, despite the theoretical equivalence of the methods. The purpose of this study was therefore to explore the influence of the choice of inverse dynamics on the calculation of inter-segmental moments.MethodsAn inverse dynamics analysis was performed to analyse vertical jumping and weightlifting movements using two distinct methods. The first method was the traditional inverse dynamics approach, in this study characterized as the 3 step method, where inter-segmental moments were calculated in the local coordinate system of each segment, thus requiring multiple coordinate system transformations. The second method (the 1 step method) was the recently proposed approach based on wrench notation that allows all calculations to be performed in the global coordinate system. In order to best compare the effect of the inverse dynamics computation a number of the key assumptions and methods were harmonized, in particular unit quaternions were used to parameterize rotation in both methods in order to standardize the kinematics.ResultsMean peak inter-segmental moments calculated by the two methods were found to agree to 2 decimal places in all cases and were not significantly different (p > 0.05). Equally the normalized dispersions of the two methods were small.ConclusionsIn contrast to previously documented research the difference between the two methods was found to be negligible. This study demonstrates that the 1 and 3 step method are computationally equivalent and can thus be used interchangeably in musculoskeletal modelling technology. It is i
Modenese L, Phillips ATM, Bull AMJ, 2010, A State of the Art 3D Model of the Lower Limb: Application to Muscle Force Estimation andValidation, 6th World Congress of Biomechanics (WCB 2010), Publisher: Springer
Shah PL, 2010, Anatomy, ERS Handbook on Respiratory Medicine, Editors: Palange, Simonds, Beaufils, Verdonk, Berlin, Germany, Publisher: European Respiratory Society Journals Ltd, Pages: 11-19, ISBN: 978-1904097990
This clinical guide provides a special focus on the normal meniscal mechanism, body and function.
Masouros SD, McDermott ID, Bull AMJ, et al., 2010, Biomechanics, The Meniscus, Editors: Beaufils, Verdonk, Berlin, Germany, Publisher: Springer, Pages: 29-37, ISBN: 9783642024498
This clinical guide provides a special focus on the normal meniscal mechanism, body and function.
Bull A, 2010, Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology: Guest Editorial, Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology, Vol: 224, ISSN: 1754-3371
Curry C, Collins W, Jarvis B, et al., 2010, What Helps Us Learn?, EDUCATIONAL LEADERSHIP, Vol: 67, Pages: 68-69, ISSN: 0013-1784
Bull A, 2010, SPECIAL ISSUE ON TECHNOLOGY IN ROWING, PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART P-JOURNAL OF SPORTS ENGINEERING AND TECHNOLOGY, Vol: 224, Pages: I-I, ISSN: 1754-3371
, 2010, The Meniscus, Publisher: Springer Berlin Heidelberg, ISBN: 9783642024498
Murphy AJ, Chee STH, Bull AMJ, et al., 2010, The calibration and application of a force-measuring apparatus on the seat of a rowing ergometer, PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART P-JOURNAL OF SPORTS ENGINEERING AND TECHNOLOGY, Vol: 224, Pages: 109-116, ISSN: 1754-3371
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- Citations: 7
Ramasamy A, Hill AM, Gibb I, et al., 2010, Explosion mediated fracture patterns relate to environment: a forensic biomechanical approach, Annual Meeting of the British Orthopaedic Research Society
Cleather DJ, Bull AMJ, 2010, Lower-extremity musculoskeletal geometry affects the calculation of patellofemoral forces in vertical jumping and weightlifting, PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE, Vol: 224, Pages: 1073-1083, ISSN: 0954-4119
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- Citations: 33
McDermott ID, Masouros SD, Bull AMJ, et al., 2010, Anatomy, MENISCUS, Editors: Beaufils, Verdonk, Publisher: SPRINGER-VERLAG BERLIN, Pages: 11-18, ISBN: 978-3-642-02449-8
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- Citations: 7
Masouros SD, Bull AMJ, Amis AA, 2010, (i) Biomechanics of the knee joint, ORTOPAED TRAUMA, Vol: 24, Pages: 84-91
The knee joint has biomechanical roles in allowing gait, flexing and rotating yet remaining stable during the activities of daily life, and transmitting forces across it. Geometrical, anatomical and structural considerations allow the knee joint to accomplish these biomechanical roles. These are addressed and discussed in this article.
Holloway M, Alpay E, Bull AMJ, 2010, A Quantitative Approach to Identifying Threshold Concepts in Engineering Education, Engineering Education 2010, Publisher: The Higher Education Academy Engineering Subject Centre
Hislop S, Cummins K, Bull AMJ, et al., 2010, Significant influence of the design of the rowing ergometer on elite athlete kinematics, PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART P-JOURNAL OF SPORTS ENGINEERING AND TECHNOLOGY, Vol: 224, Pages: 101-107, ISSN: 1754-3371
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- Citations: 3
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