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Related Concept Videos

Bones of the Upper Limb: Ulna01:15

Bones of the Upper Limb: Ulna

The ulna and radius are parallel bones of the antebrachium or the forearm. The ulna lies medially and consists of a bony tip called the olecranon process at its proximal end. This hook-like projection articulates with the olecranon fossa of the humerus and forms the "hinged" ulnohumeral part of the elbow joint. This joint facilitates forearm extension and flexion while preventing its hyperextension. Similarly, the coronoid process, another bony projection on the proximal/anterior side of the...

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Novel Triple-Loop Technique for Suturing TFCC Injuries without Transosseous Tunnel
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Peripheral triangular fibrocartilage complex tears cause ulnocarpal instability: a biomechanical pilot study.

Christopher J Dy1, E Anne Ouellette, Anna-Lena H Makowski

  • 1Hospital for Special Surgery, 535 E 70th Street, New York, NY 10021, USA. dyc@hss.edu

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|May 31, 2012
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Summary

Detachment of the triangular fibrocartilage complex (TFCC) from the ulnar styloid decreases ulnocarpal joint stiffness. However, this detachment does not significantly alter dorsal-volar excursion, suggesting specific targets for surgical repair.

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Area of Science:

  • Orthopedic biomechanics
  • Wrist joint anatomy
  • Upper extremity surgery

Background:

  • Ulnocarpal joint instability often stems from triangular fibrocartilage complex (TFCC) abnormalities.
  • The biomechanical effects of TFCC detachment from the ulnar styloid on ulnocarpal stability require further clarification.
  • Understanding these effects is crucial for developing effective surgical interventions.

Purpose of the Study:

  • To investigate whether peripheral TFCC detachment from the ulnar styloid leads to ulnocarpal instability.
  • To quantify the biomechanical changes in the ulnocarpal joint following TFCC detachment.

Main Methods:

  • Utilized 20 fresh-frozen cadaver specimens for biomechanical analysis.
  • Measured ulnocarpal joint stiffness and dorsal-volar excursion before and after a standardized TFCC detachment.
  • Employed arthroscopic observation for precise transection of the TFCC attachment.

Main Results:

  • A statistically significant decrease in ulnocarpal joint stiffness was observed post-detachment.
  • No significant difference was found in the amount of dorsal-volar excursion after TFCC detachment.
  • These findings indicate a specific loss of joint resistance rather than increased overall motion.

Conclusions:

  • Peripheral TFCC detachment from the ulnar styloid results in reduced ulnocarpal joint stiffness.
  • Biomechanical assessment did not reveal a significant increase in dorsal-volar excursion.
  • These results provide a basis for designing surgical techniques targeting ulnocarpal laxity after TFCC injury.