Department of Rehabilitation, Namdarun Rehabilitation Clinic, Yong In, Korea.
Department of Neurosurgery, Kyung Hee University Medical Centre, Seoul, Korea.
Br J Neurosurg. 2024 Feb;38(1):23-28. doi: 10.1080/02688697.2020.1866162. Epub 2020 Dec 28.
PURPOSE: Cervical total disc replacement (TDR) aims to maintain normal cervical kinematics after surgery. This study investigates the relation between shifted location of centre of rotation (COR) and subsequent surgical outcomes after multilevel cervical TDR (MCTDR) and identifies radiological parameter that corresponded to this change of COR after MCTDR. METHODS: The study included a consecutive 24 patients treated with MCTDR following the diagnosis of multilevel cervical disc herniation or stenosis. Numeric Rating Scale (NRS), range of motion (ROM) at both C2-7 segment and TDR implanted levels, and location of COR at TDR level were evaluated at pre- and post-MCTDR. These parameters were compared between patients who experienced successful and unsuccessful pain relief. RESULTS: The inherent CORs relatively at ventro-cranial coordinates have demonstrated significant migrations to dorso-caudal location, more prominent shifts for the successful group, after MCTDR switch. The unsuccessful group showed markedly reduced C2-7 ROM and reduced angular improvement at C2-7 as well as MCTDR level in comparison with the successful group. Postoperative C2-7 ROM was related to postoperative COR along the X axis. CONCLUSION: The determinant for clinical success after MCTDR, other than mere preservation of the ROM both at C2-7 and TDR levels, was restoration of COR from ventro-cranial location close to normal coordinates by posterior and inferior shifts. The position of COR along the X axis after MCTDR was important factor to determine maintenance of C2-7 ROM.
目的:颈椎间盘置换术(TDR)旨在术后维持颈椎正常运动学。本研究探讨了多节段颈椎 TDR(MCTDR)后旋转中心(COR)位置改变与随后手术结果的关系,并确定了与 MCTDR 后 COR 改变相对应的影像学参数。
方法:本研究纳入了 24 例连续诊断为多节段颈椎间盘突出或狭窄的患者,采用 MCTDR 治疗。在 MCTDR 前后,评估患者的数字评分量表(NRS)、C2-7 节段和 TDR 植入节段的活动范围(ROM)以及 TDR 节段的 COR 位置。比较两组患者的 COR 位置和手术效果。
结果:COR 相对头侧坐标的固有 COR 显示出明显的向尾侧迁移,MCTDR 转换后成功组的迁移更为明显。与成功组相比,不成功组的 C2-7 ROM 明显减少,C2-7 和 MCTDR 节段的角度改善减少。术后 C2-7 ROM 与术后 COR 沿 X 轴有关。
结论:除了在 C2-7 和 TDR 节段保持 ROM 之外,MCTDR 后临床成功的决定因素是通过向后和向下移位,将 COR 从接近正常坐标的头侧位置恢复到正常位置。MCTDR 后 COR 沿 X 轴的位置是维持 C2-7 ROM 的重要因素。
Acta Orthop Traumatol Turc. 2016