The Helical Compliance Vector: Utility for Quantifying Spinal Mechanics

IF 3.9 3区 医学 Q1 ORTHOPEDICS
JOR Spine Pub Date : 2025-06-19 DOI:10.1002/jsp2.70088
Matthew R. MacEwen, Rebecca E. Abbott, Victor H. Barocas, Arin M. Ellingson
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Abstract

Background

This study introduces the helical compliance vector (HCV), a novel measuring parameter that quantifies the orientation and magnitude of joint compliance (inverse of stiffness) by integrating kinetic and kinematic data within the helical axis framework. The HCV provides high temporal and spatial resolution, enabling detailed analysis of compliance and stiffness throughout motion, surpassing the limitations of traditional static or end-range metrics, which often fail to capture transient variations in stiffness and multiplanar interactions that occur during movement.

Methods

Eight cadaveric lumbar segments (L4–L5) were tested under pure moment loading (up to 7 Nm) in lateral bending, flexion/extension, axial rotation, and a multiplanar (Kemp's) test.

Results

The findings revealed distinct moment-specific compliance trends, with the highest compliance during low-moment flexion and the lowest during axial rotation. The Kemp's test demonstrated the HCV's ability to capture complex coupled motions, combining lateral bending and axial rotation motion. Across all loading scenarios, compliance decreased significantly near the end range of motion, illustrating its evolution throughout motion.

Conclusion

By simultaneously characterizing the magnitude and directionality of compliance, the HCV framework offers a comprehensive, high-resolution approach to understanding joint mechanics. This method establishes a foundation for investigating multiplanar joint behaviors and can be extended to in vivo applications using advanced imaging and musculoskeletal modeling technologies.

Abstract Image

螺旋顺应矢量:量化脊柱力学的实用工具
本研究引入了螺旋柔度向量(HCV),这是一种新的测量参数,通过整合螺旋轴框架内的动力学和运动学数据来量化关节柔度(刚度逆)的方向和大小。HCV提供了高时间和空间分辨率,能够在整个运动过程中详细分析顺应性和刚度,超越了传统静态或末端测量的局限性,这些指标通常无法捕捉运动过程中发生的刚度瞬态变化和多平面相互作用。方法对8个尸体腰椎节段(L4-L5)进行横向弯曲、屈伸、轴向旋转和多平面(Kemp’s)试验。结果研究结果显示了明显的矩特异性顺应性趋势,低矩屈曲时的顺应性最高,轴向旋转时的顺应性最低。Kemp的测试证明了HCV能够捕捉复杂的耦合运动,结合横向弯曲和轴向旋转运动。在所有加载场景中,在接近运动末端范围时,顺应性显著下降,说明其在整个运动过程中的演变。通过同时表征顺应性的大小和方向,HCV框架为理解关节力学提供了全面、高分辨率的方法。该方法为研究多平面关节行为奠定了基础,并可通过先进的成像和肌肉骨骼建模技术扩展到体内应用。
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来源期刊
JOR Spine
JOR Spine ORTHOPEDICS-
CiteScore
6.40
自引率
18.90%
发文量
42
审稿时长
10 weeks
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