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Related Experiment Videos

Pressure distribution in the wrist joint.

A F Tencer1, S F Viegas, J Cantrell

  • 1Division of Orthopaedic Surgery, University of Texas Medical Branch, Galveston 77550.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|January 1, 1988
PubMed
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This study measured wrist joint pressure distribution, finding that contact areas are small but experience high pressures under load. Scaphoid and lunate contact areas shift with wrist position.

Area of Science:

  • Orthopedics
  • Biomechanics
  • Human Anatomy

Background:

  • The radio-carpal joint is crucial for wrist function.
  • Understanding its pressure distribution is key to diagnosing and treating wrist injuries.
  • Previous studies have lacked detailed analysis of contact mechanics.

Purpose of the Study:

  • To quantify pressure distribution properties of the normal radio-carpal joint.
  • To develop a system for measuring contact pressure within wrist joint surfaces.
  • To analyze how wrist position affects pressure distribution.

Main Methods:

  • Developed a Fuji pressure-sensitive paper transducer system.
  • Inserted transducers via dorsal capsular incision for measurement.
  • Tested five specimens in 36 positions under axial loading.

Related Experiment Videos

  • Analyzed contact area, pressure, and centroid locations using video-imaging.

    • Main Results:

    • Scaphoid and lunate contact areas were distinct and occupied a small joint fraction (average 20.6%).
    • High pressures averaged 3.17 MPa under a 103 N load.
    • Scaphoid contact area was generally larger than the lunate, varying with wrist position.
    • Contact area centroids shifted palmarly and dorsally with flexion and extension.

    Conclusions:

    • The radio-carpal joint utilizes a small percentage of its surface area for contact under load.
    • Pressure distribution is dynamic and significantly influenced by wrist joint positioning.
    • These findings provide baseline data for understanding normal wrist biomechanics and pathology.