Search Results
Results 301 - 350 of 813
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Kawasaki S - - 2005
To analyze the load on the lumbar spine and the motion pattern of a body during a backhand stroke when playing tennis, kinematic and kinetic data of eleven amateur tennis players were collected. Each subject performed one-handed and double-handed strokes at low, medium, and high racket speeds. The three-dimensional motion ...
Pezowicz Celina A - - 2005
The anisotropic, inhomogeneous, multiply collagenous architecture of the annulus reflects the complex pattern of mainly tensile stresses developed in this region of the disc during normal function. Structural and mechanical responses of fully hydrated in-plane sections taken from within single lamellae of the outer annulus of healthy bovine caudal discs ...
Rousseau Marc-Antoine - - 2006
Because the disc and facets work together to constrain spinal kinematics, changes in the instant axis of rotation associated with disc degeneration or disc replacement may adversely influence risk for facet overloading and arthritis. The relationships between L5/S1 segmental kinematics and facet forces are not well defined, since previous studies ...
Leivseth Gunnar - - 2006
Two methods to measure sagittal plane segmental motion in the cervical spine are compared. Translational and rotational motion was measured in nine cervical motion segments of nine patients by distortion-compensated (DCRA) as well as by stereophotogrammetric Roentgen analysis (RSA). To compare measurement precision of the new DCRA protocol with the ...
Cakir Balkan - - 2006
As motion preservation is one of the main postulated advantages after total disc replacement (TDR) of the lumbar spine, the quantification of the mobility after TDR seems of special clinical interest. Yet, the best method to assess range of motion (ROM) after TDR remains unclear. The aim of the study ...
Turkstra Timothy P - - 2005
The question of which is the optimum technique to intubate the trachea in a patient who may have a cervical(C)-spine injury remains unresolved. We compared, using fluoroscopic video, C-spine motion during intubation for Macintosh 3 blade, GlideScope, and Intubating Lighted Stylet, popularly known as the Lightwand or Trachlight. Thirty-six healthy ...
Brown Taylor - - 2005
STUDY DESIGN: Compare intervertebral motion after incremental damage to posterior cervical structures in whole cadavers to motion in asymptomatic subjects. OBJECTIVE: Determine if damage to the posterior structures of the cervical spine can be detected by quantitative analysis of flexion-extension radiographs. SUMMARY OF BACKGROUND DATA: Simulated damage to the posterior ...
Leivseth Gunnar - - 2005
BACKGROUND: Knowledge on the time course of changes in cervical disc height and cervical kinematics at motion segments adjacent to congenital block vertebrae is fragmentary. Compared with this, after surgical fusion of cervical spine segments some find increased degenerative processes in combination with hypermobility or instability while others were unable ...
Swartz Erik E - - 2005
CONTEXT: In a patient with a potential cervical spine injury, minimizing or eliminating movement at the head and neck during stabilization and transport is paramount because movement can exacerbate the condition. Any equipment or technique creating less movement will allow for a more effective and safe stabilization of an injured ...
Guo Li-Xin - - 2005
To understand the dynamic characteristics of the human spine, a detailed three-dimensional finite element model of the lower thorax to pelvis segment, T12-pelvis, was developed based on actual vertebral geometry. After modal analysis, the resonant frequencies of different spinal segments were obtained. The vibration mode of T12-pelvis shows that the ...
Ngan Jim M W - - 2005
The aim of this study was to determine the in vivo kinematics of cervical rotational manipulation in normal subjects and examine the consistency of this technique within and between therapists. A four camera motion analysis system operating at 120 Hz was used to measure the head on trunk angular displacements ...
McGregor Alison H - - 2005
INTRODUCTION: Biomechanical measures of movement are being used increasingly to understand injury mechanisms and enhance performance. Frequently, rowing injuries are attributed to poor rowing technique. This suggests a need to understand technique and its influencing factors. This study aimed to quantify rowing technique in terms of lumbopelvic motion, force production, ...
Milosavljevic Stephan - - 2005
The aim of this study was to determine whether sheep shearers have clinically hypothesized adaptive postural and sagittal mobility parameters of the lumbar spine and pelvis. Sixty-four shearers and 64 non-shearers, matched by age and anthropometry and surveyed for present and previous low back pain, participated in a study to ...
Tsung Bonnie Y S - - 2005
OBJECTIVES: To measure the loads acting at the lumbar spine and the resulting motions during rotational mobilization. METHODS: Twenty healthy subjects were subjected to right rotational mobilization of different grades. The magnitude and frequency of mobilization loads were decided by an experienced manipulative therapist to be appropriate for each mobilization ...
Lee Kim K - - 2005
OBJECTIVE: In this study, the probabilistic responses of a three-dimensional finite element L2-L3 motion segment, with and without posterior elements, tested under sagittal plane loadings, are presented. Understanding the effect of biologic uncertainties and variations on the biomechanical response provides an insight into spinal behavior under normal and degenerated conditions. ...
Lee Raymond Y W - - 2005
This study measured the bending stiffness of the spine when it is subjected to posteroanterior mobilization force. The lumbar spine was modeled as an initially curved beam column supported over the rib cage and the pelvis. Posteroanterior mobilization was assumed to be three-point bending of the beam. The mobilization force ...
Ng Hong-Wan - - 2005
OBJECTIVE: Although a number of in vivo, in vitro, and finite element studies have attempted to delineate the natural biomechanics, injury mechanisms, and surgical techniques of the cervical spine, none has explored the influence of various preload magnitudes and orientations on the biomechanical responses. METHODS: A nonlinear three-dimensional finite element ...
Aultman Crystal D - - 2005
BACKGROUND: It has been shown that disc herniations are a cumulative injury created by repetitive flexion motion while under modest compressive loads. There is a lack of data linking the direction of nucleus tracking to the orientation of the bending motion axis. Our purpose was to determine if the direction ...
Berthonnaud Eric - - 2005
OBJECTIVE: The purpose of this study is to introduce a method to analyze and characterize the global sagittal balance of the human trunk using indexes derived from the shape and orientation of the pelvis and cervical, thoracic, and lumbar spine. METHODS: Standing lateral x-rays of a cohort of 160 asymptomatic ...
Hipp John A - - 2005
STUDY DESIGN: Calculate the apparent pseudarthrosis rate for anteriorly plated cervical spine fusions using different threshold levels of intervertebral rotation. OBJECTIVES: Determine whether the apparent pseudarthrosis rate depends on the amount of intervertebral rotation used to characterize a fusion as a pseudarthrosis. SUMMARY OF BACKGROUND DATA: Intervertebral motion at a ...
Abbott, J. Haxby
Background: In the clinical examination of patients with low back pain (LBP), musculoskeletal physiotherapists routinely assess lumbar spinal segmental motion by performing physical examination procedures such as observation of active range of motion and palpation of intervertebral motion. The validity of manual assessment of segmental motion, however, has not been ...
Ezoe Masamitsu - - 2005
We devised a special instrument to assess intraoperative pelvic motion and used this device to measure intraoperative pelvic motion in three dimensions. A total of 100 total hip arthroplasties (THAs) were performed using this device. Two approaches were utilized: 52 THAs were performed with the posterolateral approach and the remaining ...
Otani Kazuyuki - - 2005
To compare the motion of lumbar spondylolisthesis between the standing and decubitus positions and to identify the radiological parameters concerning segmental instability, the lumbar sagittal motion of 5 volunteers and 14 patients was recorded using video-fluoroscopy in both positions. Still images at three frames per second were captured, and the ...
Sarver Joseph J - - 2005
The mouse lumbar and tail discs are both used as models to study disc degeneration; however, the mechanical behavior of these two levels has not been compared. The objective of this study was to compare the elastic and viscoelastic mechanical properties of lumbar and tail discs of the mouse under ...
Kwak Shawn - - 2005
PURPOSE: The purpose of our study was to determine the relationship between perceived neck disability and active cervical range of motion (ROM). METHODS: Twenty-three senior center attendees aged 60 to 90 participated. Their ROM was measured using the cervical range of motion instrument (CROM). Perceived neck disability was characterized using ...
Yang Zhengyi Z Rehabilitation Sciences Department, the Hong Kong Polytechnic University, Hong Kong (e-mail: - - 2005
The surface method of measuring the movements of lower thoracic and lumbar spine with osteoporosis using Fastrak&#174; was examined for validity. There is an increasing awareness of the health risks of exposure to radiation associated with repeated radiographic assessment of spinal curvature and spinal movements. As a skin-surface measurement device, ...
Zhang Qing Hang - - 2006
A comprehensive, geometrically accurate, nonlinear C0-C7 FE model of head and cervical spine based on the actual geometry of a human cadaver specimen was developed. The motions of each cervical vertebral level under pure moment loading of 1.0 Nm applied incrementally on the skull to simulate the movements of the ...
Puttlitz Christian M - - 2004
STUDY DESIGN: An in vitro biomechanical study of C4-C5 intervertebral disc replacement using a cadaveric model. OBJECTIVES: To investigate the degree of motion afforded by a ball-and-socket cervical intervertebral disc prosthesis design. SUMMARY OF BACKGROUND DATA: Intervertebral disc prostheses designs attempt to restore or maintain cervical disc motion after anterior ...
Reitman Charles A - - 2004
STUDY DESIGN: Measure and analyze variation in intervertebral motion in asymptomatic subjects. OBJECTIVES: Gain further insight into intervertebral motion during flexion and extension in asymptomatic individuals, identify factors that contribute to variation in motion, and establish a quantitative database using a clinically practical imaging tool. SUMMARY OF BACKGROUND DATA: Several ...
Stokes Ian A F - - 2004
STUDY DESIGN: A review of the literature on macromechanical factors that accelerate disc degeneration with particular focus on distinguishing the roles of immobilization and overloading. OBJECTIVE: This review examines evidence from the literature in the areas of biomechanics, epidemiology, animal models, and intervertebral disc physiology. The purpose is to examine: ...
Stanley Scott K - - 2004
STUDY DESIGN: The authors conducted an in vitro biomechanical flexibility study of T2-S1 specimens in flexion-extension under compressive follower preloads of physiological magnitudes. OBJECTIVES: The objectives of this study were to test the hypotheses that 1) the thoracolumbar spine will support compressive preloads of in vivo magnitudes and 2) allow ...
Hall T - - 2004
A single blind, age and gender matched, comparative measurement study was designed to assess active range of cervical motion and passive range of rotation in cervical flexion in asymptomatic and cervicogenic headache subjects. Both procedures are commonly used in clinical practice to evaluate patients with cervicogenic headache. We studied 20 ...
Niosi Christina A - - 2004
This paper reviews both the normal biomechanical behavior of the lumbar motion segment and changes in that behavior with disc degeneration. Each level of the spine consists of a disc anteriorly and two facet joints posteriorly. A complex ligamentous structure also contributes to the mechanics of the spine. Degenerative changes ...
Olesen Jørgen - - 2004
As part of a larger project examining and comparing the ontogeny of all major taxa of the Branchiopoda in a phylogenetic context, the larval development of Caenestheriella gifuensis (Ishikawa, 1895), a Japanese spinicaudatan 'conchostracan', is described by scanning electron microscopy. Seven different larval stages are recognised, in most cases based ...
DiAngelo Denis J - - 2004
An in vitro biomechanical study was conducted to compare the effects of disc arthroplasty and anterior cervical fusion on cervical spine biomechanics in a multilevel human cadaveric model. Three spine conditions were studied: harvested, single-level cervical disc arthroplasty, and single-level fusion. A programmable testing apparatus was used that replicated physiological ...
DiAngelo Denis J - - 2004
OBJECT: An experimental study was performed to determine the biomechanical end-mounting configurations that replicate in vivo physiological motion of the cervical spine in a multiple-level human cadaveric model. The vertebral motion response for the modified testing protocol was compared to in vivo motion data and traditional pure-moment testing methods. METHODS: ...
Rechtine Glenn R - - 2004
BACKGROUND: The purpose of this study was to compare the motion generated when executing the bed transfer procedure in cadavers with unstable lower cervical spines. METHODS: Five cadavers received a global instability at the C5-6 level. Each cadaver was moved with and without a rigid cervical collar. The amount of ...
Hong-Wan Ng - - 2004
STUDY DESIGN: The biomechanical responses resulting from laminectomy with graded unilateral and bilateral facetectomy were quantified using a three-dimensional nonlinear finite element model of the C2-C7 motion segments. OBJECTIVE: To study the influence of laminectomy with graded unilateral and bilateral facetectomy on the cervical spinal biomechanics. SUMMARY OF BACKGROUND DATA: ...
Phillips Frank M - - 2004
STUDY DESIGN: A biomechanical study of lumbar threaded interbody cage construct under varying compressive preloads of similar magnitudes to those experienced in vivo during daily activities. OBJECTIVES: To test the hypothesis that supplemental translaminar facet screws would enhance the stability (ability to reduce segmental angular motion) of threaded interbody cages ...
Wallace Wes - - 2004
We studied the response of dendritic spines in the thalamic-recipient zone of rat visual cortex to simple manipulations of the visual environment. We measured the morphologies of a total of 3824 spines located on the basal dendrites of 60 layer 3 pyramidal cells. As expected from previous studies, we found ...
Carpaneto J - - 2004
OBJECTIVE: To design and test a protocol for the assessment of neck movements in patients affected by cervical dystonia by using an electromagnetic system. This approach could overcome the limits of the current assessment scales in this specific field. BACKGROUND: Initial assessment and function recovery during treatments are diagnosed by ...
Schumacher Reinhard - - 2004
BACKGROUND: Movements of the spinal cord are induced by arterial pulsation and breathing. OBJECTIVE: The aim of this study was to analyse these oscillations in more detail and to classify them using one-dimensional fast Fourier transformation (1D-FFT). MATERIALS AND METHODS: A total of 153 M-mode studies in 53 patients (age ...
Pflugmacher Robert - - 2004
STUDY DESIGN: An in vitro biomechanical study of expandable cages for vertebral body replacement in the human thoracolumbar spine. OBJECTIVES: The purpose of this study was to compare the in vitro biomechanical properties of 3 different expandable cages with a nonexpandable cage. SUMMARY AND BACKGROUND DATA: Recently, there has been ...
Carbotte S M - - 2004
The Earth's mid-ocean ridges display systematic changes in depth and shape, which subdivide the ridges into discrete spreading segments bounded by transform faults and smaller non-transform offsets of the axis. These morphological changes have been attributed to spatial variations in the supply of magma from the mantle, although the origin ...
Puglisi Filadelfio - - 2004
The purpose of this study was to obtain comparative data concerning the relative contribution of segmental cervical vertebral motion to the cervical range of motion (ROM) in whiplash and healthy subjects in an effort to evaluate the usefulness of X-ray analysis in future forensic and research efforts. Each subject's neck ...
James Colleen Y. - - 2004
OBJECTIVE: To quantify the cervical spine range of motion that occurred during application of 4 rigid cervical immobilization collars, the time of application, and the amount of active range of motion available after application. DESIGN AND SETTING: We evaluated the amount of cervical motion that occurred during application of 4 ...
Reitman Charles A - - 2004
STUDY DESIGN: Prospective, observational. OBJECTIVES: Quantify the changes in intervertebral motion adjacent to cervical arthrodesis over time. SUMMARY OF BACKGROUND DATA: One of the frequently acknowledged sequelae following anterior cervical fusion is the development of adjacent segment disease. It has been argued that a spine fusion transfers stress to adjacent ...
Hungerford Barbara - - 2004
OBJECTIVE: To determine whether the pattern of pelvic bone motion, determined by skin markers, differs between control subjects and subjects with posterior pelvic pain. DESIGN: Cross-sectional study of three-dimensional angular and translational motion of the innominates relative to the sacrum in two subject groups. BACKGROUND: Comparative in vivo analysis of ...
Nyland John - - 2004
OBJECTIVES: To compare the active cervical spine range of motion and resting cervical spine alignment (sagittal plane) of collegiate and high school football players using the Cervical Range of Motion (CROM) Measurement System and to identify normative values for these populations. DESIGN AND SETTING: A 2 x 7 factorial design ...
Kettler A - - 2004
The finite helical-axes method can be used to describe the three-dimensional in vitro kinematics of the spine. However, this method still suffers from large stochastic calculation errors and poorly conceived visualisation techniques. The aim of the present study, therefore, was to improve the currently used finite helical axes description, by ...
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