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[Extension of the fingers. IV. Morphologic and structural study]
J N Kuhlmann1, H Guerin-Surville, S Baux
1Laboratoire d'Anatomie de la Pitié-Salpétrière, Paris.
Bulletin De L'Association Des Anatomistes
|September 1, 1992
Summary
Tensioning the dorsal aponeurosis of digits causes retraction and alters phalangeal insertions. This complex mechanism involves muscle interactions and unique reactions affecting joint mechanics.
Area of Science:
- Biomechanics
- Anatomy
- Musculoskeletal system
Context:
- The dorsal aponeurosis of the digits plays a crucial role in finger extension and fine motor control.
- Understanding its mechanical behavior is essential for diagnosing and treating conditions affecting hand function.
Purpose:
- To analyze the mechanical responses of the dorsal aponeurosis under tension.
- To elucidate the complex interactions between fibrous structures and their impact on digital joint movement.
Summary:
- Tensioning the dorsal aponeurosis leads to its retraction and changes in insertion points on the phalanges, influenced by extensor digitorum, interosseous, and lumbrical muscles.
- The aponeurosis exhibits three distinct reactions: gliding on phalangeal epiphyses, displacement of retinacular ligament axes causing volar-ward tractions, and modified transmission pathways with length changes due to fiber interactions or joint extension.
- Detailed analysis reveals intricate fibrous and fascicular interactions and translations governing these responses.
Impact:
- Provides a deeper understanding of the biomechanics of digital extension.
- Informs the development of more effective therapeutic strategies for hand and finger injuries.
- Contributes to the field of musculoskeletal research with detailed analysis of connective tissue mechanics.
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