College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China.
College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China.
Clin Biomech (Bristol). 2024 Jun;116:106266. doi: 10.1016/j.clinbiomech.2024.106266. Epub 2024 May 26.
Most ball-in-socket artificial lumbar disc implanted in the spine result in increased hypermobility of the operative level and overloading of the facet joint.
A finite element model was established and validated for the lumbar spine (L1-L5). The structure of the Mobidisc prosthesis was modified, resulting in the development of two new intervertebral disc prostheses, Movcore and Mcopro. The prostheses were implanted into the L3/L4 level to simulate total disc replacement, and the biomechanical properties of the lumbar spine model were analyzed after the operation.
Following the implantation of the prostheses, the mobility of operative level, peak stress of lumbar spine models, and peak stress of facet joint increased. The performance of mobility was found to be more similar between Movcore and Mobidisc. The mobility and facet joint peak stress of the Mcopro model decreased progressively with an increase in the Young's modulus of the artificial annulus during flexion, extension, and lateral bending. Among all the models, the Mcopro50 model had the mobility closest to the intact model. It showed a 3% decrease in flexion, equal range of motion in extension, a 9% increase in left lateral bending, a 7% increase in right lateral bending, and a 3% decrease in axial rotation.
The feasibility of the new intervertebral disc prostheses, Movcore and Mcopro, has been established. The Mcopro prosthesis, which features an artificial annular structure, offers significant advantages in terms of reduced mobility of the operative level and peak stress of facet joint.
大多数球窝式人工腰椎间盘在脊柱中植入会导致手术节段的活动度增加和小关节负荷增加。
建立并验证了腰椎（L1-L5）的有限元模型。对 Mobidisc 假体的结构进行了修改，从而开发了两种新型椎间盘假体，Movcore 和 Mcopro。将假体植入 L3/L4 水平以模拟全椎间盘置换，并在手术后分析腰椎模型的生物力学特性。
在植入假体后，手术节段的活动度、腰椎模型的峰值应力和小关节的峰值应力增加。发现 Movcore 在活动度方面的表现与 Mobidisc 更为相似。随着人工环的杨氏模量在屈伸和侧屈过程中增加，Mcopro 模型的活动度和小关节峰值应力逐渐减小。在所有模型中，Mcopro50 模型的活动度最接近完整模型。其屈伸活动度减少 3%，伸展活动度相等，左侧侧屈增加 9%，右侧侧屈增加 7%，轴向旋转减少 3%。
新型椎间盘假体 Movcore 和 Mcopro 的可行性已经得到确立。具有人工环形结构的 McPro 假体在降低手术节段活动度和小关节峰值应力方面具有显著优势。
