Intermediate follow-up after treatment of XXXX with the Bryan Cervical Disc Prosthesis: single-level and bi-level.

@entity1 @entity16 @entity602 @entity179 @entity2531 @entity158 @entity614 @entity7443
STUDY DESIGN: Prospective, concurrently enrolled, multicenter trials of the Bryan Cervical Disc Prosthesis (Medtronic Sofamor Danek, Memphis, @entity7443 ) were conducted for the treatment of @entity1 with single-level and two-level (bi-level) @entity179 of the cervical spine. OBJECTIVES: The studies were designed to determine whether new functional intervertebral cervical disc prosthesis can provide relief from objective @entity16 and signs, improve the @entity1 's ability to perform activities of daily living, decrease @entity158 , and maintain stability and segmental motion. SUMMARY OF BACKGROUND DATA: The concept of accelerated degeneration of adjacent disc levels as a consequence of increased stress caused by interbody fusion of the cervical spine has been widely postulated. Therefore, reconstruction of a failed intervertebral disc with functional disc prosthesis should offer the same benefits as fusion while simultaneously providing motion and thereby protecting the adjacent level discs from the abnormal stresses associated with fusion. METHODS: @entity1 with symptomatic @entity614 and/or @entity602 underwent implantation with the Bryan prosthesis after a standard anterior cervical discectomy. At scheduled follow-up periods, the effectiveness of the device was characterized by evaluating each @entity1 's @entity2531 , and radiographically measured range of motion at the implanted level. RESULTS: Clinical success for both studies exceeded the study acceptance criteria of 85%. At 1-year follow-up, the flexion-extension range of motion per level: Discectomy and implantation of the device alleviates @entity16 and signs similar to anterior cervical discectomy and fusion. Radiographic evidence supports maintenance of motion. The procedure is safe and the @entity1 recover quickly. At least 5 years of follow-up will be needed to assess the long-term functionality of the prosthesis and protective influence on adjacent levels.
