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The prospective study was designed to investigate the clinical and radiographic effects of the new functional intervertebral cervical disc prosthesis in the treatment of patients with single-level and multiple-level degenerative disc disease of the cervical spine.Nineteen patients(23 discs) had spinal arthroplasty with placement of the Bryan cervical artificial disc prosthesis during Dec 2003 to Oct 2006 in our hospital.