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Full-Text Articles in Medicine and Health Sciences
Kinematic Demands Of Nucleus Arthroplasty Technology, Elizabeth J. Sander
Kinematic Demands Of Nucleus Arthroplasty Technology, Elizabeth J. Sander
Theses and Dissertations (ETD)
Recent advancements in biomaterial technologies have fostered growth in alternative surgical procedures to fusion surgery for treatment of early stages of degenerative disc disease. One application of immediate interest is that of nucleus arthroplasty (NA). Novel materials are being developed to better match the nonlinear biomechanical properties of the native tissue. The effects of changing the motion segment unit (MSU) properties via surgery (nucleotomy) or placement of a nucleus arthroplasty material, changes the effort or work required to move the altered spine condition through a prescribed kinematic path relative to the intact spine condition. The closer the loading mechanics of …
A Kinematics-Based Testing Protocol To Study The Mechanics Of The Human Lumbar Spine, Nephi A. Zufelt
A Kinematics-Based Testing Protocol To Study The Mechanics Of The Human Lumbar Spine, Nephi A. Zufelt
Theses and Dissertations (ETD)
The objective of this work was to develop a new kinematics-based testing protocol to quantify the axial and shear force components and rotational moment properties of the human cadaveric lumbar motion segment unit (MSU) in response to specific kinematic inputs. Modern, non-fusion spinal devices claim to treat degenerative disc disease better than traditional fusion surgery. Though there have been many biomechanical studies completed on these devices, there is still a debate over their efficacy. Conventional testing methods provide insight into the rotational properties of the MSU but lack the sensitivity or capacity to quantify lumbar MSU’s mechanical properties including shear …
Use Of Compliant Interbody Force Sensing Grafts To Compare Load Sharing Properties Of Unidirectional And Bidirectional Multilevel Dynamic Translational Anterior Cervical Plates, Jason Roscoe Roberson
Use Of Compliant Interbody Force Sensing Grafts To Compare Load Sharing Properties Of Unidirectional And Bidirectional Multilevel Dynamic Translational Anterior Cervical Plates, Jason Roscoe Roberson
Theses and Dissertations (ETD)
INTRODUCTION: Pseudoarthrosis is a relatively rare complication following anterior cervical arthrodesis, and is felt to be related to stress shielding. To address this, dynamic anterior cervical plates have emerged to maintain load sharing as an arthodesis matures. Dynamic plates can translate bidirectionally (allow translation in compressive and tensile loads), or unidirectionally (allow translation in compression, but maintain its position under tensile loads). The objective of this study was to compare the graft load mechanics between three plated conditions during settling using compliant interbody load cells: A static (fixed, non-moving) plate, a unidirectional multi-level translational plate design, and a bidirectional two-level …