Kinematic Demands of Nucleus Arthroplasty Technology

Sander, Elizabeth J

doi:10.21007/etd.cghs.2008.0274

Cited by 1 publication

(1 citation statement)

References 51 publications

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“…The Spine Robot was used to develop a unique fixed axis testing protocol (21,86,88). This protocol utilizes a built-in tool transform function to coordinate the movement of three actuators simultaneously to rotate about any anatomical location within spine.…”

Section: Fixed Axismentioning

confidence: 99%

Robotic Simulation of Disc Arthroplasty Surgery: Influence of Surgical Placement on Motion Segment Dynamics

Dhillon¹

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A variety of total disc replacement (TDR) designs exist for the treatment of disc pathologies. A key design parameter for a constrained ball and socket device is the location of the fixed center of rotation (COR). A previous study demonstrated that intact motion segment unit (MSU) mechanics and range of motion (ROM) were sensitive to the location of a prescribed sagittal plane rotational axis. Mal-alignment between the implant COR and the COR of the MSU may lead to an overloaded or over constrained condition. Two paradigms exist for the placement of a fixed COR TDR device relative to MSU anatomy: positioning the implant midline or posterior to midline. Presently, there are no data to indicate which paradigm may lead to better biomechanical/clinical outcome. This research attempts to evaluate changes in MSU mechanics and ROM as a result of variations in the size and placement of a simulated ball and socket TDR, like the ProDisc-L lumbar disc prosthesis. Six human cadaveric lumbar MSUs, L4-L5, were tested in flexion/extension using the Spine Robot to an end load limit of 8Nm. A fixed axis protocol was used to impose a pure rotation about a desired anatomical location. The Spine Robot was programmed to rotate the MSU about the COR of the implant. Subsequently, with the MSU held rigid, the implant was removed and rotation about the implant's COR was repeated. Thereafter, simulated CORs were tested in different anatomical locations as defined by a customized grid pattern. The grid pattern consisted of 8 CORs which simulated the placement of a medium and large size constrained ball and socket device. Measurements of shear forces along the disc plane, axial force normal to the disc plane, segmental bending moment, and segmental ROM were analyzed at each grid point.

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Section: Fixed Axismentioning

confidence: 99%

Robotic Simulation of Disc Arthroplasty Surgery: Influence of Surgical Placement on Motion Segment Dynamics

Dhillon¹

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Kinematic Demands of Nucleus Arthroplasty Technology

Cited by 1 publication

References 51 publications

Robotic Simulation of Disc Arthroplasty Surgery: Influence of Surgical Placement on Motion Segment Dynamics

Robotic Simulation of Disc Arthroplasty Surgery: Influence of Surgical Placement on Motion Segment Dynamics

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