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J. Patrick Johnson, Carl Lauryssen, Helen O. Cambron, Robert Pashman, John J. Regan, Neel Anand and Robert Bray

Object

The authors evaluated cervical spine radiographs to determine sagittal alignment in patients who underwent one- or two-level arthroplasty with the Bryan cervical artificial disc prosthesis.

Methods

The curvature of the surgically treated spinal segments and the overall curvature of the cervical spine were evaluated in 13 patients who underwent 16 cervical arthroplasty device placements. Preoperative and postoperative lateral radiographs were reviewed and compared using standardized techniques for measuring spinal curvature. Patients who underwent a single-level cervical arthroplasty had a 4.7° mean reduction (p < 0.05) in lordosis after cervical artificial disc replacement. The three patients who underwent two-level cervical arthroplasty had no significant changes in the sagittal alignment.

Conclusions

Patients who underwent arthroplasty with a Bryan cervical artificial disc had a focal loss of lordosis (that is, kyphosis) at the treated levels after single-level procedures. Nevertheless, there was no significant change in the overall sagittal curvature of the cervical spine after single-level artificial disc replacements. The patients who underwent two-level artificial disc placement had no significant changes in lordosis at the treated levels or in the overall curvature. The likely source of this outcome appears to be the endplate milling procedures that reorient the vertebral endplates.

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Srinath Samudrala, Shoshanna Vaynman, Ty Thiayananthan, Samer Ghostine, Darren L. Bergey, Neel Anand, Robert S. Pashman and J. Patrick Johnson

mass. This method has its fulcrum through the anterior spinal column and ultimately “shortens” the spinal canal. It also results in bone-on-bone contact in all 3 columns to facilitate fusion. In this study, we characterize CTJ deformity and describe how PSO performed at the CTJ can be used to correct the regional sagittal alignment of the cervical spine and the location of the head in relation to the thoracic spine. We report the surgical technique and the postoperative results following osteotomy at the CTJ in 8 patients. Methods We identified and conducted a

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J. Patrick Johnson, Robert S. Pashman, Carl Lauryssen, Neel Anand, John J. Regan and Robert S. Bray

body habitus and spinal column alignment that may exhibit a characteristic asymmetrical hump in the presence of significant scoliotic deformity ( Fig. 6 ). Full-length (36 × 14—in) standing spinal radiography is performed to assess the overall spinal balance ( Fig. 2 ). Cobb angles are measured on these radiographs by using a goniometer in both AP and lateral orientations (briefly, a perpendicular line is drawn from the endplates of the most angulated vertebrae involved in the pathological curve [ Fig. 7 ]). Coronal and sagittal alignment is assessed using a plumb

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examined include presence of interbody fusion, rod diameter, rod material, age and preop sagittal alignment. Methods: A retrospective review of a multicenter, prospective ASD database was conducted. Inclusion criteria: age=18yr, ASD, no revisions between >6wk and <2yrs postop. Spinal pelvic parameters, thoracic kyphosis (TK:T2-T12) and lumbar lordosis (LL:L1-S1) were measured overall and within and outside of the instrumented segments. Changes for SVA, PT, PI-LL, TK, and LL between 6wks-2yrs postop were calculated. Of these pts, the amount of thoracic loss and TL

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30; p<0.001). Conclusions The addition of PPI seems to have a protective effect on the development of PJK. The analysis controlled for preoperative sagittal alignment as well as for correction of PI-LL. HYB was effective in restoring sagittal global alignment and cMIS in maintaining it. Neurosurg Focus Neurosurgical Focus FOC 1092-0684 American Association of Neurological Surgeons 2014.3.FOC-DSPNABSTRACTS Abstract Mayfield Clinical Science 243. Microendoscopic Decompression for Cervical Spondylotic Myelopathy

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-0684 American Association of Neurological Surgeons 10.3171/2017.3.FOC-DSPNabstracts 2017.3.FOC-DSPNABSTRACTS Charles Kuntz Scholar Award Presentations (Abstracts 104–123) 119. Laminoplasty vs. Laminectomy-Fusion for the Treatment of Cervical Myelopathy: Preliminary Results from the CSM-Study Comparing Cervical Sagittal Alignment and Clinical Outcomes Vijay Ravindra , MD, MSPH , Jill Curran , MS , Praveen V. Mummaneni , MD , Adam S. Kanter , MD , Erica Fay Bisson , MD, MPH , Robert F. Heary , MD