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• W2053933150 abstract "In Brief Study Design. Benchtop biomechanics study examining kinematic effects of progressive resection in a human cadaveric spine model. Objective. 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). Summary of Background Data. Although the clinical results after CDA have been studied, there remain unanswered questions regarding the surgical techniques used at the time of device insertion. For example, it is unclear whether a surgeon should retain or resect the PLL and uncinate processes at the time of primary surgical intervention. Further, the effect of a subsequent posterior decompression (foraminotomy or laminectomy) on the stability of a motion segment containing a disc arthroplasty is unknown. Methods. Three-dimensional intervertebral motion was measured by biplanar videography in human cadaveric spines at C4–C5 or at C5–C6 subjected to a 1.5-Nm moment applied to induce motion in the sagittal plane. Coupled motions were not constrained. After measuring intact spine motion, disc arthroplasty with bilateral ventral foraminotomy was performed without PLL resection. Sequentially, rotations and translations were measured after PLL resection, unilateral foraminotomy, bilateral foraminotomy, and laminectomy. Results. CDA with bilateral ventral foraminotomy increased sagittal rotation by 0.4° (16%) compared with the intact spine. The addition of PLL resection increased rotation by 0.5° (14% increase). Unilateral and bilateral foraminotomy had negligible effects on sagittal rotation or anteroposterior (AP) translation. Laminectomy resulted in an additional sagittal plane rotation of 2°. The sagittal-plane interverterbal rotation resultant after all interventions was 6°, with 1.5 mm of AP translation occurring only. Conclusion. Given that a greater degree of motion was seen with PLL resection combined with ventral foraminotomy, we recommend that PLL resection be performed when performing CDA. In our benchtop model, unilateral and bilateral posterior foraminotomies were not associated with the creation of significant sagittal rotational or AP translational instability. We examined the kinematic effects of posterior longitudinal ligament (PLL) resection, posterior foraminotomy, and laminectomy in a human cadaveric model containing a disc arthroplasty (cervical disc arthroplasty). Cervical disc arthroplasty with ventral foraminotomy and PLL resection increased motion compared with the intact motion segment. Bilateral posterior foraminotomy and laminectomy doubled intervertebral rotation without producing segmental instability." @default.
• W2053933150 created "2016-06-24" @default.
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• W2053933150 date "2010-08-01" @default.
• W2053933150 modified "2023-10-11" @default.
• W2053933150 title "Kinematics of Progressive Circumferential Ligament Resection (Decompression) in Conjunction With Cervical Disc Arthroplasty in a Spondylotic Spine Model" @default.
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• W2053933150 doi "https://doi.org/10.1097/brs.0b013e3181c55bcd" @default.
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