Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"axial rotation"”.
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Passive Stiffness Characteristics of the Scoliotic Lumbar Torso in Trunk Flexion, Extension, Lateral bending, and Axial Rotation
… tests (torso lateral side bending, torso axial rotation, and torso flexion/extension) that isolated mobility to the in vivo lumbar spine. Scoliotic individuals with Cobb angles ranging 15-75 degrees were accepted. Applied torque was measured using a uni-directional load cell, and inertial …
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Rotation of a slender rod injected into a cylindrical constraint
… into a cylindrical constraint while undergoing axial rotation. Particular focus is given to extension of the helical buckling length. This problem is of particular application to coiled tubing operations in the oil and gas industry where helical buckling and eventual lockup occur, thereby …
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Biomechanical Testing of Two-Level Cervical Disc Arthroplasty
… flexion-extension, lateral bending, and axial rotation to an end-limit load of 3-Nm or 45o rotation. Rotations at the superior, implanted, and inferior motion segment units (MSU) of the instrumented conditions were normalized to the non-instrumented condition and analyzed using one-way …
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A new portable 3D gyroscope system for the evaluation of upper limb function
… ±9.37o for adduction-abduction, and ±12.28o for axial rotation based on upper and lower regression boundaries containing 90% of data values. Percentage error in ROM was 9.45%, 9.37%, and 12.28% respectively for a ROM of 100o. Special attention should be paid to activities involving large axial …
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Biomechanical Comparison of Lumbar Disc Replacements
… and right lateral bending, and left and right axial rotation. Testing conditions, in order, were the harvested state, ProDisc-L at L5-S1, Maverick at L5-S1, and a pedicle screw fixation at L5-S1. ProDisc-L was less flexible than Maverick in flexion but otherwise similar. ProDisc-L and Maverick …
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The effect of change to duration of isometric contraction in muscle energy technique to the upper cervical spine
… of MET isometric contractions on active atlanto-axial rotation range of motion. 52 asymptomatic subjects (age 18-43) who displayed a unilateral active atlanto-axial rotation asymmetry of 4 degree or more were randomly allocated to either a 5 (n=17) or 20 second (n=18) isometric contraction MET …
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A Novel Distractive and Mobility-Enabling Lumbar Spinal Orthosis for Treating Mechanical Low Back Pain
… included both flexion and extension as well as axial rotation. The DMO3 prototype was tested in the RTP under a 150 N applied vertical load over a range of 25° flexion to 10° of extension utilizing a previously-developed protocol. Also, the DMO3 prototype was tested in the RTP under simulated …
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Assessing the Use of Ultrasound to Quantify Spine Kinematics
… spine motion in various positions of flexion and axial rotation using two separate ultrasound-based methods and was compared to surface-based optoelectronic motion capture. 14 instances of outlier range of motion were detected with the sagittal imaging method and complex movement sequences were …
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A Computer Simulation Model of The Human Head-Neck Musculoskeletal System
… on a previous <em>in vitro</em> model of the sub-axial cervical spine that was developed within the rigid body dynamic simulation program, Visual Nastran 4D. Interconnecting joints, including intervertebral discs, facet joints, ligaments, and the C0-C1-C2 complex, were defined. The primary neck …
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The effect of thoracolumbar high velocity low amplitutde manipulation on gross trunk rotational range of motion: is the position of the technique important?
… two thrust manipulations on the gross trunk rotational range of motion (GTR) of the spine in an asymptomatic population. Ninety subjects (57 female, 33 male) aged 18 to 40 years were randomly allocated into three intervention groups; receiving either a HVLA manipulation in the side-lying …
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A patient specific total disc replacement to treat degenerative disc disease
… flexion/extension, lateral bending, and axial rotation. A version of this geometry was then fabricated using an inkjet printed plastic and polydimethylsiloxane (PDMS) and tested in a six-axis spine simulator to validate the FE simulations. To relate the mechanics of this TDR scaffold to …
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Effect of tibial insertion points for lateral suture stabilization on the kinematics of the cranial cruciate ligament deficient-stifle during early, middle and late stance: An in vitro study
… stifle in the medial-lateral direction and axial rotation but performed poorly in restoring stifle kinematics in the cranial-caudal plane as compared to LSSTT.<br />Clinical significance: LSSTT and LSSEG techniques failed to completely restore normal stifle kinematics in CrCL-D stifles in …
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Biomechanical Comparison of Meniscal Repair Systems in Shear Loading
… often occurs as a result of a varus or valgus rotation of the femur on the tibia coupled with axial rotation while the knee is partially flexed, thus creating preferential loading of the posterior horn and shear forces on the meniscus. Such injuries can be repaired surgically, either with …
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An In Vivo histological, and In Vitro biomechanical study of nucleus replacement with a novel polymeric hydrogel
… of 9 cadaveric motion segments loaded in axial rotation, lateral bending, flexion/extension (FE) and compression. Specimens were tested sequentially in the intact state, following annulotomy, discectomy and after hydrogel treatment. Range of Motion (ROM) in FE was shown to increase from …
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A Virtual Model of the Human Cervical Spine for Physics-based Simulation and Applications
… the model included the percent contribution of rotation relative to global rotation, coupling behaviors, helical axes of motion pattern, global rotational stiffness curves, and animations of the disc and facet forces. This model was used to evaluate different mounting configurations for axial …
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Validation Testing of a Synthetic Spine and Upgraded Protocol for a Biomechanical Evaluation of a Lumbar Spinal Orthosis
… the local and global instantaneous axis of rotation of each spinal segment to be defined. Combined with moment data, the moment-rotational stiffness properties was compared to similar published data from other in vitro and in vivo studies of the lumbar spine. These comparisons provided …
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EVALUATING THE EFFECT OF AGE AND SEX ON UPPER LIMB KINEMATICS AMONG SASKATCHEWAN FARMERS DURING FARM TASKS.
… task and maximum dominant humeral external rotation (R2 = 0.294, P < 0.014) in the overhead drilling task. The axial rotation range of motion in overhead drilling was also associated with age (R2 = 0.328, P < 0.08). With advancing age, there are some upper limb kinematic changes in farmers …
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An Investigation of Technique and Equipment Factors Associated with Clubhead Speed in Golf
… as height and physical factors such as trunk rotational power have been previously considered to be of importance. However, biomechanical factors such as; the X-factor (separation of the trunk-pelvis alignment when viewed in the transverse plane), have been a major focus of recent research. …
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Use of Compliant Interbody Force Sensing Grafts to Compare Load Sharing Properties of Unidirectional and Bidirectional Multilevel Dynamic Translational Anterior Cervical Plates
… left-right lateral bending, and left-right axial rotation under displacement control to a load limit of 3.0 Nm or 30 degrees of motion. Four different spine conditions were evaluated: the harvested (H) condition and three types of instrumented conditions containing two-level discectomy and …
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Biomechanical Comparison of Traditional Laminectomy and Minimally‑Invasive Facetectomies
… it combined a sagittal bend with a forced axial rotation. Rotational values were analyzed at the end limit of 8 Nm for flexion and extension and at 6 Nm for left and right lateral bending. Translations under PM and CLM were calculated utilizing a simulation software Visual Nastran. The …
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