No Kyphosis With Bryan Prosthesis Cervical Arthroplasty

No significant difference in cervical sagittal alignment with Bryan disc arthroplasty or fusion

FRIDAY, June 3 (HealthDay News) -- Cervical arthroplasty with Bryan Cervical Disc Prosthesis results in a clinically insignificant increase in segmental kyphosis in patients with one-level cervical disease, according to a study published in the June 1 issue of Spine.

Rick C. Sasso, M.D., from the Indiana University School of Medicine in Indianapolis, and colleagues evaluated the focal and overall sagittal alignment angulation (lordosis or kyphosis) immediately and two years after surgery in 48 patients with one-level cervical disease. A total of 22 patients undergoing single-level Bryan Cervical Disc Prosthesis were compared with 26 patients undergoing single-level anterior cervical discectomy and fusion with allograft and plate. Overall C2 to C7 change and treatment-level sagittal alignment, disc spaces heights, and motion range were evaluated.

The investigators found an equivalent overall preoperative sagittal alignment in both the groups. The overall lordosis at 24-month follow-up was not statistically different between Bryan and fusion patients, or from the preoperative value for each group. At the treated level, the Bryan group had an immediate postoperative nonsignificant increase in disc angle of 0.92 degrees. The posterior disc height was slightly but significantly more in the Bryan group than in the fusion patients (0.7 mm), but the anterior disc height remained the same throughout.

"Bryan disc was not kyphotic postoperatively; an improvement in local lordosis of just less than 1 degree occurred," the authors write.

Several authors disclosed financial relationships with the pharmaceutical or medical device industries, and the study was partially funded by corporate and/or industry funds.

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