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Intra-Articular Pressure in the Distal Radioulnar Joint: A Biomechanical Study.

Rodrigo Gutiérrez-Monclus1, Héctor Gutiérrez-Espinoza2, Felipe Araya-Quintanilla3

  • 1Hand Team of Traumatology Institute of Santiago, Santiago, Chile.

The Journal of Hand Surgery
|December 9, 2023
PubMed
Summary

Forearm rotation significantly impacts distal radioulnar joint (DRUJ) pressure, especially in supination. Avoid supination exercises in early TFCC injury rehab due to elevated DRUJ pressure.

Keywords:
Biomechanical phenomenacadaverdistal radioulnar jointintra-articular pressure

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Area of Science:

  • Orthopedic biomechanics
  • Upper extremity anatomy
  • Sports medicine research

Background:

  • The distal radioulnar joint (DRUJ) is crucial for forearm rotation.
  • Understanding DRUJ intra-articular pressure is vital for diagnosing and treating injuries.
  • Forearm muscle loading and stabilizing structures influence DRUJ mechanics.

Purpose of the Study:

  • To investigate the effect of forearm muscle loading and stabilizer disruption on DRUJ intra-articular pressure.
  • To analyze pressure changes across various forearm rotations (neutral, pronation, supination, extension, flexion).
  • To evaluate the impact of triangular fibrocartilage complex (TFCC) and other stabilizer damage on DRUJ pressure.

Main Methods:

  • Utilized ten cadaveric forearm models without significant DRUJ pathology.
  • Measured intra-articular pressure in the DRUJ under six loading conditions, including no load, loaded, and varying degrees of stabilizer disruption (TFCC, ulnar ligaments, interosseous membrane, pronator quadratus).
  • Assessed pressure across five distinct forearm rotations.

Main Results:

  • Highest intra-articular pressures were consistently observed in supination under no disruption, loaded, and disrupted TFCC conditions.
  • Loaded conditions without disruption increased DRUJ pressure by 1.57 kg/cm² in neutral rotation compared to no load.
  • Flexion with a disrupted TFCC showed a significant pressure increase (4.3 kg/cm²), while supination with only TFCC disruption also increased pressure (3.3 kg/cm²).

Conclusions:

  • Forearm intra-articular pressure is significantly influenced by rotation and the integrity of stabilizing structures.
  • Supination positions generate higher DRUJ pressures, particularly when the TFCC is compromised.
  • Rehabilitation protocols for TFCC injuries should cautiously approach supination exercises in initial phases to mitigate excessive DRUJ pressure.