Bryan

This was a prospective, non‐randomized, comparative study of patients with myelopathy or radiculopathy who underwent Bryan (Medtronic Sofamor Danek, Memphis, TN) cervical disc arthroplasty in Beijing Jishuitan Hospital from March 2004 to December 2007. All the patients enrolled in the present study were treated by the same team, and all operations were performed by the same experienced group using the standard Bryan disc arthroplasty procedures.
A total of 66 patients that had completed clinical and radiographic follow‐up were included in this study. The mean follow‐up time was more than 10 years, and the follow‐up rate was 77.6%. The mean age of patients was 55.9 ± 7.9 years and consisted of 41 men (62.1%) and 25 women (37.9%). The index level included C_3/4 (2 levels, 3.0%), C_4/5 (13 levels, 19.7%), C_5/6 (43 levels, 65.2%), and C_6/7 (8 levels, 12.1%). According to the symptoms, patients were divided into a myelopathy group (total of 38 patients (57.6%), including 16 patients with myelopathy and 22 patients with myeloradiculopathy) and a radiculopathy group (28 patients, 42.4%).

This study was conducted between December 2002 and December 2004, with more than eight years of follow-up. A total of 93 patients were included in the study. Patients either received the Bryan (Medtronic Sofamor Danek Inc, USA) cervical disc arthroplasty (CDA group; 39 cases) or underwent anterior cervical decompression and fusion surgery (ACDF group; 54 cases). There were 29 cases in the CDA group and 39 cases in ACDF group who completed the final follow-up and who had complete imaging data (follow-up rate 73.12%). The demographic information and baseline data of the two patient groups showed no significant differences, and the two patient groups were considered to be comparable (Table 1). All operations were performed by the same surgeon (the corresponding author).