标题： 指间伸肌机制交叉纤维束对肌肉力量的传递有显著影响 显示英文标题

标题： The Bundles of Intercrossing Fibers of the Extensor Mechanism of the Fingers Greatly Influence the Transmission of Muscle Forces

摘要： 伸肌机制是一种腱性结构，在手指功能中起着重要作用。 它通过胶原纤维片将多个内在和外在肌肉的力传递到手指上的多个骨性附着点。 最重要的附着点位于中间指骨和远端指骨的基部。 然而，肌肉产生的力如何贡献于附着点的力尚不完全清楚。 除了被广泛接受的伸肌内侧和骨间外侧带之外，还存在两层交叉的纤维束（浅层骨间内侧纤维层和深层伸肌外侧纤维层），它们相互连接。 与将其理想化为一个由独立绳索组成的最小网络不同，我们构建了一个由纤维束组成的数值模型，以评估多个交叉纤维束在产生静态手指力中的作用。 我们将这个更详细的伸肌机制模型与仅包含伸肌内侧和骨间外侧带的理想化最小网络进行了比较。 我们发现，包括交叉纤维束显著影响力的传递，而这种传递本身取决于手指姿势。 我们得出结论，交叉纤维束——在之前的模型中由于Zancolli的简化而被忽略——在力的传递以及力随姿势变化中起着重要作用。 显示英文摘要

摘要： The extensor mechanism is a tendinous structure that plays an important role in finger function. It transmits forces from several intrinsic and extrinsic muscles to multiple bony attachments along the finger via sheets of collagen fibers. The most important attachments are located at the base of the middle and distal phalanges. How the forces from the muscles contribute to the forces at the attachment points, however, is not fully known. In addition to the well-accepted extensor medial and interosseous lateral bands of the extensor mechanism, there exist two layers of intercrossing fiber bundles (superficial interosseous medial fiber layer and deeper extensor lateral fiber layer), connecting them. In contrast to its common idealization as a minimal network of distinct strings, we built a numerical model consisting of fiber bundles to evaluate the role of multiple intercrossing fiber bundles in the production of static finger forces. We compared this more detailed model of the extensor mechanism to the idealized minimal network that only includes the extensor medial and interosseous lateral bands. We find that including bundles of intercrossing fiber bundles significantly affects force transmission, which itself depends on finger posture. We conclude that the intercrossing fiber bundles - traditionally left out in prior models since Zancolli's simplification - play an important role in force transmission and variation of the latter with posture.