Publications
113 results found
Zioupos P, Hansen U, Currey JD, 2008, Microcracking damage and the fracture process in relation to strain rate in human cortical bone tensile failure, J Biomechanics, 2008, 41(14):2932-9
Harry LE, Sandison A, Paleolog EM, et al., 2008, Comparison of the healing of open tibial fractures covered with either muscle or fasciocutaneous tissue in a murine model, JOURNAL OF ORTHOPAEDIC RESEARCH, Vol: 26, Pages: 1238-1244, ISSN: 0736-0266
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- Citations: 113
Hopkins AR, Hansen UN, Bull AM, et al., 2008, Fixation of the reversed shoulder prosthesis, J Shoulder and Elbow Surgery, 2008
Amadi HO, Hansen UN, Wallace AL, et al., 2008, A scapular coordinate frame for clinical and kinematic analyses, JOURNAL OF BIOMECHANICS, Vol: 41, Pages: 2144-2149, ISSN: 0021-9290
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- Citations: 9
Amadi HO, Sanghavi SM, Kamineni S, et al., 2008, Definition of the capsular insertion plane on the proximal humerus, Journal of Anatomy, Vol: 212, Pages: 863-867, ISSN: 0021-8782
The aim of this work was quantitatively to establish the relationship between the plane that hosts the humeral head lateral margin (anatomical neck) and that of the capsular insertion. Eight cadaveric shoulders were used. These were dissected, exposing the humeral head margin and the root of the capsular humeral insertion to extract digitally their outlines using a mechanical 3‐d digitizer. The datasets of the digitized outlines were applied and the geometric planes they best fitted mathematically calculated. Vector analysis techniques were finally applied to the two planes to quantify the relationship between them. The humeral head margin is circular (± 2.2% of radius), having each of its outlining points on the same plane (within ± 1.5 mm.) The capsular attachment outlining points also insert on a plane (± 1.4 mm). The two planes are related to one another by an inclination of 14.5 ± 3.6°. The relationship described here would allow for in vivo prediction of humeral attachment of capsular structures by using radiological datasets of the anatomical neck. This would be useful in patient‐specific modelling to study and understand the glenohumeral ligament kinematics during clinical examinations and to plan surgical reconstructive procedures.
Brassart N, Sanghavi S, Hansen UN, et al., 2008, Loss of rotator cuff tendon-to-bone interface pressure after reattachment using a suture anchor, JOURNAL OF SHOULDER AND ELBOW SURGERY, Vol: 17, Pages: 784-789, ISSN: 1058-2746
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- Citations: 5
Amadi HO, Banerjee S, Hansen UN, et al., 2008, A optimised method for quantifying glenoid orientation, International Journal of Shoulder Surgery, Vol: 2, Pages: 25-29, ISSN: 0973-6042
A robust quantification method is essential for inter-subject glenoid comparison and planning of total shoulder arthroplasty. This study compared various scapular and glenoid axes with each other in order to optimally define the most appropriate method of quantifying glenoid version and inclination.Six glenoid and eight scapular axes were defined and quantified from identifiable landmarks of twenty-one scapular image scans. Pathology independency and insensitivity of each axis to inter-subject morphological variation within its region was tested. Glenoid version and inclination were calculated using the best axes from the two regions.The best glenoid axis was the normal to a least-square plane fit on the glenoid rim, directed approximately medio-laterally. The best scapular axis was the normal to a plane formed by the spine root and lateral border ridge. Glenoid inclination was 15.7° ± 5.1° superiorly and version was 4.9° ± 6.1°, retroversion.The choice of axes in the present technique makes it insensitive to pathology and scapular morphological variabilities. Its application would effectively improve inter-subject glenoid version comparison, surgical planning and design of prostheses for shoulder arthroplasty.
U Hansen, P Zioupos, R Simpson, et al., 2008, The Effect of Strain Rate on the Mechanical Properties of Human Cortical Bone, Journal of Biomechanical Engineering
Chen Q-Z, Bismarck A, Hansen U, et al., 2008, Characterisation of a soft elastomer poly(glycerol sebacate) designed to match the mechanical properties of myocardial tissue, BIOMATERIALS, Vol: 29, Pages: 47-57, ISSN: 0142-9612
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- Citations: 413
Abdul-Kadir MR, Hansen UN, Klabunde R, et al., 2007, Finite element modelling of primary hip stem stability: The effect of interference fit, Journal of Biomechanics
Chena QZ, Wright JS, Harding SE, et al., 2007, Heart tissue engineering using a novel elastomer and ES-derived cardiac cells, Conference of the Tissue-Engineering-and-Regenerative-Medicine-International-Society (TERMIS-EU), Publisher: MARY ANN LIEBERT INC, Pages: 1703-1703, ISSN: 1076-3279
A Hart, T Seepaul, R Hewitt, et al., 2007, The palmar Locking Compression Plate is biomechanically comparable to the dorsal Pi plate for dorsally comminuted, intra-articular wrist fractures, Journal of Hand Surgery (European Volume)
RL Simpson, FE Wiria, AA Amis, et al., 2007, Development of a 95/5 Poly(L-Lactide-co-Glycolide)/Hydroxylapatite & b-Tricalcium Phosphate Scaffold as Bone Replacement material via Selective Laser Sintering, Journal of Biomedical Materials Research: Part B – Applied Biomaterials
Hopkins AR, Hansen UN, Amis AA, et al., 2007, Wear in the prosthetic shoulder: Association with design parameters, JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME, Vol: 129, Pages: 223-230, ISSN: 0148-0731
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- Citations: 38
Hopkins AR, Hansen UN, Amis AA, et al., 2007, Glenohumeral kinematics following total shoulder arthroplasty: A finite element investigation, JOURNAL OF ORTHOPAEDIC RESEARCH, Vol: 25, Pages: 108-115, ISSN: 0736-0266
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- Citations: 24
Gregory T, Hansen U, Emery RJ, et al., 2007, Developments in shoulder arthroplasty, PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE, Vol: 221, Pages: 87-96, ISSN: 0954-4119
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- Citations: 19
A J Hart T Seepaul R J Hewitt S Ang U Hansen AA Amis, 2007, The palmar locking compression plate is biomechanically comparable to the dorsal Pi plate for dorsally comminuted, intra-articular wrist fractures, J Hand Surg (Eur & Br)
Bethune H R, Hansen U, Emery R J, et al., 2007, The glenoid component of total shoulder replacements, The Evidence of Orthopaedic Surgery, Editors: Limb, Hay, UK, Publisher: tfm Publishing, Pages: 91-98, ISBN: 9781903378366
Hill AM, Jones IT, Hansen U, et al., 2006, Treatment of ligament laxity by electrothermal shrinkage or surgical plication: A morphologic and mechanical comparison, JOURNAL OF SHOULDER AND ELBOW SURGERY, Vol: 16, Pages: 95-100, ISSN: 1058-2746
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- Citations: 3
Kadir M R, Hansen U, Amis A A, et al., 2006, The effect of muscle loads on the interface micromotion of hip stems, ISTA
Zioupos P, Hansen U, 2006, The development of microdamage as a function of strain rate in human cortical bone, ISTA
Kadir M R A, Hansen U N, Klabunde R, et al., 2006, The effect of malalignment and undersizing on primary stability of cementless stems, 5th World Congress of Biomechanics
Kadir M R A, Hansen U, Amis A A, 2006, The effect of press-fit on predicted micromotion and subsidence of hip stems, Computer Methods in Biomechanics and Biomedical Engineering
Kadir M R A, Hansen U N, Klabunde R, et al., 2006, Primary hip stem stability: the effect of bone pathology on micromotion, ISTA
Gupta S, Hansen U N, Sanghavi S, et al., 2006, The mechanism of failure in cemented glenoid components — an in vitro study, ISTA
Hansen U, Masouros S, Amis AA, 2006, Material properties of biological tissues related to joint surgery, CURRENT ORTHOPAEDICS, Vol: 20, Pages: 16-22, ISSN: 0268-0890
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- Citations: 10
Masouros S D, Bull A M J, Hansen U N, et al., 2006, Applying constraints in finite element modelling of articular structures
Amadi HO, Bull AMJ, Hansen UN, 2006, A resultant force and limiting ligament strains approach to computing glenohumeral joint translations, 5th World Congress of Biomechanics, Publisher: Journal of Biomechanics, Pages: S496-S496
The aims of this study were (1) to create a tool to investigate the loading of the intracapsular ligaments of the GHJ during shoulder movement, and (2) to investigate how the humeral head may need to translate to minimise ligament overstraining.Imaging datasets were used to create surface geometries of the GHJ. A joint coordinate system (JCS) was applied for kinematics description1. Five ligaments were modelled with literature-provided properties and insertions2,3. An algorithm was developed to relate clinical shoulder position data to the JCS. Ligament paths were modelled as a straight line from glenoid to humeral insertion with spherical wrapping on the humeral head adjusted according to the actual surface contour. These were used to quantify a resultant effect of the ligament loading. Physiological kinematics data during passive clinical examinations of the arm4 were applied to the model. In order to limit the overstraining of the ligaments, translations were imposed on these kinematics data in the direction of the resultant forces due to the ligaments. These translation were limited when the ligament strains were below an experimentally-derived physiological threshold2,3. Individual ligament loads of up to 290 N were predicted during impingement test kinematics when translations were not taken into account. This same movement resulted in a computed 3.1 mm anteroinferior translation of the humeral head when limiting ligament strains. There were no predicted translations for pure abduction and forward flexion without humeral axial rotation.There is currently no direct measure of translations of the shoulder that can be applied clinically. This work is a novel method that allows the relative ligament restraints during physiological motion to be calculated taking into account possible GHJ translations. This can be applied in guiding clinical kinematics tests, as well as surgical interventions.1Wu et al, J Biomech, 20052Boardman et al, J Should Elb Surg, 19963Biglian
Hopkins AR, Hansen UN, Amis AA, et al., 2006, Finite element modelling of glenohumeral kinematics following total shoulder arthroplasty, JOURNAL OF BIOMECHANICS, Vol: 39, Pages: 2476-2483, ISSN: 0021-9290
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- Citations: 17
Hopkins AR, Hansen UN, Amis AA, 2005, Finite element models of total shoulder replacement: application of boundary conditions, Computer Methods in Biomechanics and Biomedical Engineering, Vol: 8, Pages: 39-44, ISSN: 1025-5842
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