Department of Orthopedics, Dongzhimen Hospital, Beijing University of Chinese Medicine, No. 5 Haiyuncang Street, Dongcheng District, Beijing, 100700, China.
School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.
J Orthop Surg Res. 2022 Mar 9;17(1):149. doi: 10.1186/s13018-022-03051-2.
Evaluation of the mid-long-term kinematics of single-level Bryan artificial cervical disc replacement (ACDR) in vivo by analyzing the center of rotation (COR) at the operated level.
A retrospective analysis was conducted using data collected from 38 patients who underwent single-level Bryan ACDR from January 2010 to March 2013. Radiological parameters including range of motion (ROM), lordosis angle, translation, and COR were obtained. Clinical outcomes were assessed based on Odom Criteria, modified Japanese Orthopedic Association (mJOA), Neck Disability Index (NDI), and Visual Analogue Scale (VAS) scores. Correlations between COR and other follow-up data were discussed at the last follow-up.
Compared with preoperative values, the last follow-up data showed that 86.84% of cases achieved good-or-excellent outcomes based on Odom criteria; Significant improvements were observed across all scales assessed for clinical outcomes (P < 0.05); Lordosis angle was significantly increased in both the overall cervical spine and the operated level (P < 0.05); ROM of the overall cervical spine, operated level, and adjacent levels was preserved (P > 0.05); There was no significant change in COR at the operated level (P > 0.05). At the last follow-up and at the operated level, COR (Y) showed negative correlations with ROM and translation (P < 0.05), but no follow-up data correlated with COR (X) were found (P > 0.05).
Satisfactory clinical and radiological outcomes were achieved 7 years or more after single-level Bryan ACDR. At the operated level, preoperative COR was maintained, probably due to replicating the physiological interrelations of COR (Y), translation, and ROM.
通过分析手术节段的旋转中心（COR），评估单节段 Bryan 人工颈椎间盘置换（ACDR）的中-长期运动学。
回顾性分析 2010 年 1 月至 2013 年 3 月行单节段 Bryan ACDR 的 38 例患者的资料。获得运动范围（ROM）、前凸角、平移和 COR 等影像学参数。根据 Odom 标准、改良日本骨科协会（mJOA）评分、颈椎残障指数（NDI）和视觉模拟量表（VAS）评分评估临床结果。最后随访时讨论了 COR 与其他随访数据的相关性。
末次随访时，86.84%的病例根据 Odom 标准达到良好或优秀的结果；所有临床评估量表的评分均有显著改善（P<0.05）；整体颈椎和手术节段的前凸角均显著增加（P<0.05）；整体颈椎、手术节段和相邻节段的 ROM 得以保留（P>0.05）；手术节段的 COR 无显著变化（P>0.05）。末次随访时和手术节段 COR（Y）与 ROM 和平移呈负相关（P<0.05），但未发现与 COR（X）相关的随访数据（P>0.05）。
单节段 Bryan ACDR 后 7 年或以上，获得了满意的临床和影像学结果。在手术节段，维持了术前 COR，这可能是由于复制了 COR（Y）、平移和 ROM 的生理相关性。
