摘要
目的 :分析脊柱处于不同姿势时腰椎小关节受力大小及变化情况。方法 :采用 8具新鲜脊柱腰骶段 (L1~S1)标本 ,在MTS系统上用压敏片测量L4、5小关节面在中立位和前屈、后伸位时受力大小。结果 :中立位时L4、5小关节受力为 (3 1.16± 7.15 )N ,占轴向压缩载荷的 15 % ;前屈时小关节受力减小 ,前屈 10°、2 0°时受力大小为 (18.3 2± 4.46)N、(9.3 8± 1.82 )N ,占压缩载荷的比例减为 9%、5 % ;后伸时小关节受力增大 ,后伸 10°、2 0°时受力大小为 (4 5 .92± 11.0 6)N、(65 .68± 10 .16)N ,占压缩载荷的比例增至2 3 %、3 3 %。结论 :腰椎小关节在中立位能承受脊柱的一部分压缩载荷 ,且随脊柱姿势不同小关节面受力也不同。
Objective: To study the relationship between the body posture and the borne force of lumbar facet joints. Methods: Eight fresh lumbar-sacral spinal (L 1~S 1) specimens were placed on the MTS system. The borne forces of the two facet joints of the L 4,5 motion segments were measured using pressure sensitive films when the specimens were in erect, flexed and extended postures. Results: In erect posture the facet joints were subjected to 31.16±7.15N force(15% of the axial compression forces). In flexed posture the loaded forces of the facet joints decreased. When the specimens were at 10 and 20 degrees flexion, the borne forces were 18.32±4.46N (9% of the compression force) and 9.38±1.82N (5% of the compression force). In extension posture the forces of the facet joints increased. In the posture of 10 and 20 degrees extension, the forces were 45.92±11.06N (23%) and 65.68±10.16N (33%). Conclusion: The lumbar facet joints can share some of the compression forces of the spine in erect posture. And the proportion of share changes with the change of posture.
出处
《中国临床解剖学杂志》
CSCD
北大核心
2003年第1期87-89,共3页
Chinese Journal of Clinical Anatomy
基金
广东省科技攻关项目 (99B0 670 3G)
关键词
腰椎
小关节
压敏片
生物力学
lumbar spine
facet joint
pressure sensitive films
biomechanics