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Relationship between ulnar variance and triangular fibrocartilage complex thickness.

A K Palmer, R R Glisson, F W Werner

    The Journal of Hand Surgery
    |September 1, 1984
    PubMed
    Summary
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    This study found that increased positive ulnar variance is linked to a thinner triangular fibrocartilage complex (TFCC) disc. This inverse relationship is crucial for understanding wrist biomechanics and potential TFCC injuries.

    Area of Science:

    • Orthopedics
    • Biomechanics
    • Anatomy

    Background:

    • The triangular fibrocartilage complex (TFCC) is a critical structure in wrist stability.
    • Ulnar variance, the relative length of the ulna compared to the radius, is a known factor influencing wrist joint mechanics.

    Purpose of the Study:

    • To experimentally measure the thickness of the thinnest aspect of the TFCC articular disc.
    • To investigate the relationship between TFCC thickness and ulnar variance.

    Main Methods:

    • Experimental measurement of TFCC disc thickness.
    • Comparison of measurements with pre-operative ulnar variance data.

    Main Results:

    • A statistically significant inverse relationship was observed between positive ulnar variance and TFCC thickness.

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  • Specifically, greater positive ulnar variance correlated with a thinner TFCC disc.

    • Conclusions:

    • Positive ulnar variance is associated with reduced thickness in the thinnest portion of the TFCC.
    • These findings contribute to understanding the structural implications of ulnar variance on TFCC integrity and may inform clinical assessments of wrist injuries.