Luo Bangmin, Li Yikai, Wang Cheng, Xu Zhun
Department of Spine Surgery, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan, China.
School of Traditional Chinese Medicine, Southern Medical University, Guangzhou, Guangdong, China.
Front Bioeng Biotechnol. 2025 Mar 27;13:1533585. doi: 10.3389/fbioe.2025.1533585. eCollection 2025.
The objective of this study was to explore the effects of four Manipulations of lower limb hyperextension (MLLHs) on the sacroiliac joint (SIJ) and surrounding ligaments.
A three-dimensional finite element model of the pelvis was built. Four MLLHs were simulated. The stresses on the pelvis and SIJ were calculated. The SIJ displacements and ligament strains were analyzed.
Under MLLH-F1, -F2, -F3 and -F4, the maximum stresses on the pelvis were 49.2, 50.5, 48.6 and 54.0 MPa, and the maximum stresses on the left SIJ were 3.1, 3.2, 3.0 and 3.4 MPa, respectively. The total SIJ displacements were 0.129, 0.164, 0.080 and 0.154 mm under MLLH-F1, -F2, -F3 and -F4, respectively. The four MLLHs all caused different degrees of ligament strain, MLLH-F2 the greatest.
MLLH-F2 and -F4 caused greater stresses on the pelvis and the SIJ surface. The four MLLHs all produced small SIJ displacements. MLLH-F2 produced the largest SIJ displacement and the greatest ligament strain. These findings can guide the choice of therapy.
本研究旨在探讨四种下肢过伸手法（MLLH）对骶髂关节（SIJ）及周围韧带的影响。
构建骨盆的三维有限元模型。模拟四种MLLH。计算骨盆和SIJ上的应力。分析SIJ位移和韧带应变。
在MLLH-F1、-F2、-F3和-F4作用下，骨盆上的最大应力分别为49.2、50.5、48.6和54.0兆帕，左侧SIJ上的最大应力分别为3.1、3.2、3.0和3.4兆帕。在MLLH-F1、-F2、-F3和-F4作用下，SIJ的总位移分别为0.129、0.164、0.080和0.154毫米。四种MLLH均引起不同程度的韧带应变，其中MLLH-F2引起的应变最大。
MLLH-F2和-F4对骨盆和SIJ表面产生的应力更大。四种MLLH均产生较小的SIJ位移。MLLH-F2产生的SIJ位移最大，韧带应变也最大。这些研究结果可为治疗方法的选择提供指导。
