The distal radioulnar joint. Anatomic and functional considerations

Area of Science:

• Orthopedics
• Anatomy
• Biomechanics

Background:

• The distal radioulnar joint (DRUJ) is functionally coupled with the proximal radioulnar joint (PRUJ), forming a crucial mechanism for longitudinal hand rotation.
• DRUJ mobility is determined by joint geometry, articular surfaces, and radioulnar connections, allowing pronation and supination across all forearm positions.
• A distinct structural and functional separation exists between the DRUJ and carpal joints.

Purpose of the Study:

• To elucidate the integrated function and structural relationships of the distal radioulnar joint.
• To emphasize the role of the ulnar articular disk in joint stability.
• To advocate for a broader contextual understanding of DRUJ pathologies.

Main Methods:

• Review of anatomical and biomechanical principles governing radioulnar joint function.
• Analysis of the morphologic features and functional significance of the ulnar articular disk.
• Examination of developmental data to infer architectural schemes.

Main Results:

• The ulnar articular disk is integral to both DRUJ and carpal joint stability, possessing unique morphologic features for independent joint stabilization.
• Developmental data suggest the DRUJ is part of a larger, integrated architectural scheme.
• Proper alignment and function of the DRUJ are dependent on its relationship with other forearm structures.

Conclusions:

• Traumatic lesions and alignment disturbances of the DRUJ must be considered within the broader context of the entire forearm's functional anatomy.
• The interconnectedness of the radioulnar joints and the stabilizing role of the ulnar articular disk are key to understanding DRUJ health.
• A comprehensive approach is necessary for diagnosing and managing DRUJ conditions.