Identify posture-dependent interactions among intercrossing fiber bundles that enable finger function

Identify the posture-dependent interactions by which the intercrossing fiber bundles of the finger extensor mechanism—specifically the interosseous medial fibers and the extensor lateral fibers—enable force transmission and functional coupling across the finger joints.

Background

The extensor mechanism includes intercrossing fiber bundles (interosseous medial fibers and extensor lateral fibers) that couple force transmission between the medial and lateral bands and may tighten or slack with posture changes, influencing how forces are distributed.

While prior models have often idealized the mechanism as a minimal network of strings, understanding the detailed, posture-dependent interactions of these fiber bundles is critical for explaining finger function and informing clinical and robotic applications.