The Orthobullets Podcast Hand⎪Wrist Ligaments & Biomechanics
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May 16, 2024 Dive into the intricate world of wrist ligaments and biomechanics. Discover the critical roles of extrinsic and intrinsic ligaments in maintaining wrist stability. The discussion highlights fascinating carpal relationships that enhance practical understanding. Real-world clinical scenarios bridge theory with practice, making complex concepts accessible and engaging. This enlightening exploration of wrist dynamics is a must for anyone interested in biomechanics!
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Wrist Planes and Motion Ranges
- The wrist has three axes of motion: flexion-extension, radial-ulnar deviation, and pronosupination.
- Normal and functional range of motions differ between joints, with various percentages contributed by radiocarpal and midcarpal joints.
Wrist Biomechanics Theories
- Three main biomechanical concepts explain wrist motion: the link, column, and rows concepts.
- The link concept highlights the radius, lunate, and capitate as a chain with the capitate head as the rotation center.
Load Transfer in the Wrist
- The distal radius bears 80% of wrist load while the distal ulna bears 20%.
- Ulna load bearing increases with ulnar lengthening and decreases with ulnar shortening.