Wrist Kinetics Post-Scapholunate Dissociation: Experimental and Computational Analysis of Scapholunate Interosseous Ligament Injury

Q3 Medicine
Sunjung Kim PhD , Wedam Nyaaba PhD , Majd Mzeihem MD , Alfonso Mejia MD, MPH , Mark Gonzalez MD, PhD , Farid Amirouche PhD
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Abstract

Purpose

The scapholunate ligament, linking the scaphoid and lunate bones, is crucial for wrist stability and motion. An injury to this ligament disrupts wrist biomechanics, leading to compromised functionality and a higher risk of osteoarthritis.

Methods

Eight wrist specimens were used on a custom rig to study the effects of scapholunate ligament injury. The rig stabilized the hand while allowing controlled finger flexion. Sensors measured contact pressure, and motion sensors tracked scaphoid and lunate movements. Forces simulated finger flexion, and a finite element analysis model replicated wrist kinematics and pressure distribution.

Results

Scaphoid and lunate movement significantly varied with ligament condition, showing increased scapholunate distance in distal-proximal directions and decreased in medial-lateral directions for full tears. Lunate angles shifted from flexion to extension with fully torn ligaments, whereas the scaphoid shifted from extension to flexion. Proximal movement was noted for all groups, with significant differences in the partial tear group. A significant lateral deviation of the scaphoid and lunate was found when the ligament was damaged.
An increase in radioscaphoid contact area was noted in the presence of a ligament tear; however, statistical significance was not established. Conversely, only finger pressure exhibited a statistically significant decrease in the presence of an scapholunate ligament tear.
The findings, confirmed by finite element analysis and experiments, accurately replicated scaphoid and lunate movements, with peak radiocarpal pressure significantly differing between intact and fully torn ligaments.

Conclusions

Scapholunate ligament damage alters wrist stability, affecting bone movement and angles, leading to radial deviation and proximal displacement of the scaphoid and lunate bones.

Clinical relevance

Chronic untreated conditions may lead to early arthritis. Experimental results, validated through finite element analysis, suggest potential utility in clinical decision-making and treatment selection.
目的连接肩胛骨和月骨的肩胛韧带对腕部的稳定性和运动至关重要。该韧带损伤会破坏腕部生物力学,导致功能受损,并增加骨关节炎的风险。方法在定制的支架上使用八个腕部标本,研究肩胛韧带损伤的影响。该装置在稳定手部的同时允许手指受控弯曲。传感器测量接触压力,运动传感器跟踪肩胛骨和月骨的运动。结果肩胛骨和月骨的运动随韧带状况的变化而显著不同,在完全撕裂的情况下,肩胛骨在远端-近端方向的距离增加,而在内侧-外侧方向的距离减少。韧带完全撕裂时,月骨角度从屈曲转向伸展,而肩胛骨则从伸展转向屈曲。所有组别均出现近端移动,部分撕裂组别差异显著。当韧带受损时,肩胛骨和新月形骨会出现明显的侧向偏移。韧带撕裂时,肩胛骨与桡骨的接触面积会增加,但统计学意义并不明显。经有限元分析和实验证实,研究结果准确地复制了肩胛骨和月骨的运动,完整韧带和完全撕裂韧带之间的桡骨峰值压力存在显著差异。结论肩胛韧带损伤会改变手腕的稳定性,影响骨骼的运动和角度,导致肩胛骨和月骨向桡侧偏移和近端移位。通过有限元分析验证的实验结果表明,它在临床决策和治疗选择方面具有潜在的实用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
1.10
自引率
0.00%
发文量
111
审稿时长
12 weeks
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