Search Results
Results 51 - 100 of 810
1 2 3 4 5 6 7 8 9 10 >
Campbell Brad D - - 2010
Controlled laboratory study, with measurements taken before and after a standardized clinical intervention. To determine if thoracic manipulation alters the posteroanterior (PA) spinal stiffness of the thoracic spine, and the factors associated with any potential changes in stiffness. Spinal manipulation is commonly used to treat thoracic pain and dysfunction. Therapists ...
Takigawa Tomoyuki - - 2010
In vitro human cadaveric biomechanical study. The objectives were to determine the effect of total disc replacement (TDR) on kinematics, especially range of motion (ROM), helical axis of motion (HAM), and facet joint contact force. Ball-and-socket type artificial discs are designed to mimic normal motion, but the biomechanical effect on ...
Berkhout Gregorius C G - - 2010
We present a method to efficiently sort orbital angular momentum (OAM) states of light using two static optical elements. The optical elements perform a Cartesian to log-polar coordinate transformation, converting the helically phased light beam corresponding to OAM states into a beam with a transverse phase gradient. A subsequent lens ...
Mahato Niladri Kumar - - 2010
Transitional states of vertebrae at the lumbosacral junction are associated with low back pain. Lumbarization may present as partial (incomplete separation of S1-S2 bodies and their neural arches) or complete separation of the S1 from the S2 segment in a sacrum. Separation of S1 entails alteration of the anatomy at ...
Lee Michael J - - 2010
Traditionally, management of spinal pathology has centered on decompression, correction of deformity, and stabilization. Deformity correction and stabilization have been accomplished largely by spinal fusion at the pathologic levels. In addition to the risks and potential complications, there are sequelae to a successful fusion. Therefore, attention is being directed toward ...
Duval Karine - - 2010
The purpose of this study was first to investigate whether foot pronation (measured as calcaneal eversion) induced an anterior tilt of the pelvis and increased the degree of lumbar lordosis. Second the study investigated whether foot supination (measured as calcaneal inversion) induced a posterior pelvic tilt and a decreased lumbar ...
Patwardhan A G - - 2012
This study tested the hypotheses that (1) cervical total disc replacement with a compressible, six-degree-of-freedom prosthesis would allow restoration of physiologic range and quality of motion, and (2) the kinematic response would not be adversely affected by variability in prosthesis position in the sagittal plane. Twelve human cadaveric cervical spines ...
van Sittert Sybrand J - - 2010
As mammalian cervical vertebral count is almost always limited to seven, the vertebral column of the giraffe (Giraffa camelopardalis) provides an interesting study on scaling and adaptation to shape in light of these constraints. We have defined and described the growth rates of the lengths, widths, and heights of the ...
Lark S - - 2010
It has been established that Rugby players have reduced active cervical function that further declines with increased number of playing years; noticeable even over a single season. Here we examine one possible reason, namely insufficient recovery during the off-season, which will only be exacerbated by the trend towards a decreasing ...
Lee Michael J - - 2010
A cadaveric simulation model of the lumbar spine was used to study the intervertebral motion characteristics of the lumbar spine after bilateral laminotomy and facet-sparing laminectomy. To assess differences in motion patterns and lumbar spine stiffness after bilateral laminotomy versus laminectomy. Spondylolisthesis after facet-sparing laminectomy has been reported with a ...
Whitcroft Katherine L - - 2010
Experimental study. Cervical range of motion (CROM) was measured using different clinical methods. To compare the reliability and accuracy of visual estimation, tape measurement, and the universal goniometer (UG) with that of the CROM goniometer in measuring active CROM in healthy volunteers. The secondary objective was to identify the single ...
Roberto Rolando F - - 2010
Benchtop biomechanics study examining kinematic effects of progressive resection in a human cadaveric spine model. To determine the effects of posterior longitudinal ligament (PLL) resection, unilateral and bilateral foraminotomy, and laminectomy on cervical intervertebral rotation and translation after cervical disc arthroplasty (CDA). Although the clinical results after CDA have been ...
Rohlmann Antonius - - 2010
Pedicle-screw-based motion preservation systems are often used to support a slightly degenerated disc. Such implants are intended to reduce intradiscal pressure and facet joints forces, while having a minimal effect on the motion patterns. In a probabilistic finite element study with subsequent sensitivity analysis, the effects of 10 input parameters, ...
Strube Patrick - - 2010
Progression of superior adjacent segment degeneration (PASD) could possibly be avoided by dynamic stabilization of an initially degenerated adjacent segment (AS). The current study evaluates ex vivo the biomechanics of a circumferential fixation connected to posterior dynamic stabilization at the AS. 6 human cadaver spines (L2-S1) were stabilized stepwise through ...
Conrad Bryan P - - 2010
BACKGROUND: Hospital bed transfers, moves to examination room, X-ray, hospital bed, and/or surgery, have the potential of causing harm to a patient with an unstable cervical spine. This study evaluated motion generated in an unstable segment of the cervical spine during hospital bed transfers. A secondary goal purpose was to ...
Deniz Fatih Ersay - - 2010
OBJECT: The authors investigated the biomechanical properties of transpedicular discectomy in the thoracic spine and compared the effects on spinal stability of a partial and total facetectomy. METHODS: Human thoracic specimens were tested while intact, after a transpedicular discectomy with partial facetectomy, and after an additional total facetectomy was incorporated. ...
Pasha Saba - - 2010
STUDY DESIGN: Pelvic dynamic analysis in adolescents with idiopathic scoliosis (AIS). OBJECTIVE: To examine and characterize pelvis dynamics in AIS. SUMMARY OF BACKGROUND DATA: Although studies have examined spine and pelvis postural differences between female adolescents with and without scoliosis much is still unknown about the dynamics of pelvis in ...
Herzog Walter - - 2010
Biomechanics is the science that deals with the external and internal forces acting on biological systems and the effects produced by these forces. Here, we describe the forces exerted by chiropractors on patients during high-speed, low-amplitude manipulations of the spine and the physiological responses produced by the treatments. The external ...
Decock Lieven - - 2011
In a famous critique, Goodman dismissed similarity as a slippery and both philosophically and scientifically useless notion. We revisit his critique in the light of important recent work on similarity in psychology and cognitive science. Specifically, we use Tversky's influential set-theoretic account of similarity as well as Gärdenfors's more recent ...
Ayturk Ugur M - - 2010
To date, studies that have investigated the kinematics of spinal motion segments have largely focused on the contributions that the spinal ligaments play in the resultant motion patterns. However, the specific roles played by intervertebral disk components, in particular the annulus fibrosus, with respect to global motion is not well ...
Fayyazi Amir H - - 2010
STUDY DESIGN: Prospective case series OBJECTIVE: This was designed to precisely measure motion after posterior dynamic stabilization using Dynesys instrumentation. SUMMARY OF BACKGROUND DATA: The Dynesys posterior dynamic stabilization system, which stabilizes the spinal segment while potentially decreasing the risk of adjacent segment disease, is undergoing evaluation by the US ...
Miller Christopher P - - 2010
STUDY DESIGN: Prospective cohort study. OBJECTIVE: To evaluate the relative efficacies of soft and rigid collars for restricting both the full, active and functional ranges of motion (ROM) of the cervical spine during 15 activities of daily living (ADLs). SUMMARY OF BACKGROUND DATA: Cervical collars are frequently used for the ...
Wu Shyi-Kuen - - 2010
STUDY DESIGN: A blind, repeated-measure design was employed in the study. OBJECTIVE: To quantitatively measure the percentage contribution of segmental angular motion during different motion ranges of cervical flexion-extension for clinical applications and better understanding of cervical biomechanics. SUMMARY OF BACKGROUND DATA: Restriction of cervical motion is a major symptom ...
Nelson Tim S - - 2010
OBJECTIVE: To evaluate a prototype sagittal plane surrogate neck model designed to provide a biofidelic response to head-first impacts with a straightened cervical posture. METHODS: Published biomechanical studies were used in the design to define the range of motion (ROM) and stiffness in both flexion-extension rotation and axial compression. The ...
Wei Feng - - 2010
Lumbar spinal stenosis is a common problem that is receiving attention with the advent of novel treatment procedures. Prior positional MRI studies demonstrated lumbar canal diameter changes with flexion and extension. There have not been any studies to examine the amount of spinal canal diameter change relative to the amount ...
Utter Andrew - - 2010
Fluoroscopic assessment of the effects of commercially available spinal orthotics on lumbar vertebral motion as subjects performed flexion and extension maneuvers. To quantitate the effects of 3 commonly available, off-the-shelf, soft, and semirigid spinal orthoses on lumbar spinal motion. Commercially available soft and semirigid orthoses are widely prescribed for patients ...
Audette Isabel - - 2010
STUDY DESIGN: Clinical measurement, validity and intrarater reliability study. OBJECTIVES: (1) To confirm the validity and assess between-day test-retest reliability of cervical spine motion measurements made with the cervical range of motion (CROM) device in flexion, extension, bilateral rotation, and bilateral side flexion; (2) to provide meaningful information to clinicians ...
Petschauer Meredith A - - 2010
Proper management of cervical spine injuries in men's lacrosse players depends in part upon the ability of the helmet to immobilize the head. To determine if properly and improperly fitted lacrosse helmets provide adequate stabilization of the head in the spine-boarded athlete. Crossover study. Sports medicine research laboratory. Eighteen healthy ...
Ivancic Paul C - - 2010
STUDY DESIGN: An in vitro biomechanical study of the effectiveness of halo-vest fixation. OBJECTIVE: The objective was to evaluate motion of the injured cervical spine with normal halo-vest application and vest loose in the prone and supine positions. SUMMARY OF BACKGROUND DATA: Snaking motion of the neck is defined as ...
Damon Andrew M - - 2010
INTRODUCTION: Military aviators are susceptible to spinal injuries during high-speed ejection scenarios. These injuries commonly arise as a result of strains induced by extreme flexion or compression of the spinal column. This study characterizes the vertebral motion of two postmortem human surrogates (PMHS) during a simulated catapult phase of ejection ...
Veres Samuel P - - 2010
The role of torsion in the mechanical derangement of intervertebral discs remains largely undefined. The current study sought to investigate if torsion, when applied in combination with flexion, affects the internal failure mechanics of the disc wall when exposed to high nuclear pressure. Thirty ovine lumbar motion segments were each ...
Hussain Mozammil - - 2010
STUDY DESIGN: Biomechanics of normal vertebral segments adjacent to a degenerated segment in the cervical spine. OBJECTIVE: To test the hypothesis of higher motion changes in the segment immediately inferior to a degenerated segment. SUMMARY OF BACKGROUND DATA: Past research has shown how disc degeneration (DD) affects adjacent segments; however, ...
Fürweger Christoph - - 2010
To evaluate clinical targeting precision and assess patient movement data during fiducial-free, single-fraction spinal radiosurgery with the Cyberknife (CK). Image-guided spine tracking accuracy was tested using two phantoms. Movement patterns (three translations, roll, pitch and yaw) were obtained from log files of 260 patient treatments (47 cervical, 89 thoracic, 90 ...
Xia Qun - - 2010
Lumbar vertebrae are complicated in structure and function. The purpose of this study was to investigate the in-vivo motion characteristics of different portions of the lumbar vertebrae during functional activities. Motion of L2, L3 and L4 was reproduced using a combined dual fluoroscopic and MR imaging technique during flexion-extension and ...
McDonald Colin P - - 2010
BACKGROUND CONTEXT: Previous research has quantified cervical spine motion with conventional measurement techniques (eg, cadaveric studies, motion capture systems, and fluoroscopy), but these techniques were not designed to accurately measure three-dimensional (3D) dynamic cervical spine motion under in vivo conditions. PURPOSE: The purposes of this study were to characterize the ...
Hall Toby - - 2010
STUDY DESIGN: Reliability of clinical measurements over time. OBJECTIVES: To determine the long-term stability and minimal detectable change (MDC) of the flexion-rotation test (FRT) measurements over days in subjects with cervicogenic headache (CGH). BACKGROUND: The FRT is used by physical therapists to assist in identifying upper cervical movement impairment, as ...
Parmentier E - - 2010
Mochokidae are able to produce pectoral spine stridulation sounds. During sound production, high speed videos were used to study the pectoral fin movements to identify the mechanisms involved. A call consisted of a series of pulses and occurred during a spine sweep, which was in fact made up of a ...
Bible Jesse E - - 2010
STUDY DESIGN: Prospective clinical study. OBJECTIVE: The purpose of this investigation was to quantify normal lumbar range of motion (ROM) and compare these results with those used to perform 15 simulated activities of daily living (ADLs) in asymptomatic subjects. SUMMARY OF BACKGROUND DATA: Previous studies reporting the ROM of the ...
Marin F - - 2010
BACKGROUND: The main functions of the cervical spine are the stabilization and the orientation of the head. Pathologies are complex and difficult to diagnose. The first sign of the dysfunction is an abnormal intervertebral motion. It is the purpose of this feasibility study to determine the intersegmental motions and loading ...
Key Josephine - - 2010
Structurally, the sacrum-coccyx provides the dual roles of serving as the base of the spinal column while also forming part of the pelvic ring. Physiological movement control of the pelvis and the spine are functionally interdependent. In particular, intra-pelvic control, (that between the ilia and sacrum/coccyx in support and control ...
Steinmetz Michael P - - 2010
The craniovertebral junction is a complex region that incorporates the occiput-C1-C2 portions of the spine. It is a transition between the cranium and the mobile cervical spine that permits significant motion. The motions afforded and the anatomy are vastly different at the occiput-C1 and C1-C2 articulations. These differences make treating ...
Del Rossi Gianluca - - 2010
In the prehospital setting, spine-injured patients must be transferred to a spine board to immobilize the spine. This can be accomplished using both manual techniques and mechanical devices. The study aimed to evaluate the effectiveness of the scoop stretcher to limit cervical spine motion as compared to 2 commonly used ...
Barbir Ana A College of Engineering and Mathematical Sciences, University of Vermont, 33 Colchester Avenue, 207 Perkins Hall, Burlington, VT 05405, USA. - - 2010
Enzymatic treatments were applied to rat motion segments to establish structure-function relationships and determine mechanical parameters most sensitive to simulated remodeling and degeneration. Rat caudal and lumbar disc biomechanical behaviors were evaluated to improve knowledge of their similarities and differences due to their frequent use during in vivo models. Caudal ...
Delank Karl-Stefan - - 2010
INTRODUCTION: When decompression of the lumbar spinal canal is performed, segmental stability might be affected. Exactly which anatomical structures can thereby be resected without interfering with stability, and when, respectively how, additional stabilization is essential, has not been adequately investigated so far. The present investigation describes kinetic changes in a ...
Bible Jesse E - - 2010
STUDY DESIGN: Prospective clinical study. OBJECTIVE: The purpose of this investigation was to quantify normal cervical range of motion (ROM) and compare these results to those used to perform 15 simulated activities of daily living (ADLs) in asymptomatic subjects. SUMMARY OF BACKGROUND DATA: Previous studies looking at cervical ROM during ...
Demetropoulos Constantine K - - 2010
STUDY DESIGN: Biomechanical study of the ProDisc-L in a cadaveric model under pure moment loading. OBJECTIVE.: To determine the kinematic properties of a lumbar spine motion segment and the adjacent level following ProDisc-L disc replacement in the cadaveric spine. SUMMARY OF BACKGROUND DATA: Total disc replacement is intended to preserve ...
Lopez-Valdes Francisco J - - 2010
Quantifying the kinematics of the human spine during a frontal impact is a challenge due to the multi-degree-of-freedom structure of the vertebral column. This papers reports on a series of six frontal impacts sled tests performed on three Post Mortem Human Surrogates (PMHS). Each subject was exposed first to a ...
Weiss Hans-Rudolf - - 2010
Bracing concepts in use today for the treatment of scoliosis include symmetric and asymmetric hard braces usually made of polyethylene (PE) and soft braces. The plaster cast method worldwide seems to be the most practiced technique for the construction of hard braces at the moment. CAD (Computer Aided Design) systems ...
Chung Chin Youb - - 2010
The purpose of this study was to analyze kinematic trunk motion data in normal adults and to investigate gender effect. Kinematic trunk motion data were obtained for 20 healthy subjects (11 men and 9 women; age from 21 to 40 years) during walking a 9 m long lane at a ...
Raison Maxime - - 2010
The internal forces in the human body in motion could provide valuable information for the evaluation and follow-up of subjects with musculo-skeletal pathologies, such as scoliosis, but are still difficult to accurately measure. In this context, the objective of this study is to quantify the global intervertebral torques along the ...
1 2 3 4 5 6 7 8 9 10 >