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Related Experiment Videos

A biomechanical study of wire fixation.

J R Davey, R B Bourne, J B Finlay

    Canadian Journal of Surgery. Journal Canadien De Chirurgie
    |January 1, 1987
    PubMed
    Summary

    Bending stainless steel wire does not significantly weaken it, but knots can be points of failure. The square knot is the strongest, while loop and twist knots are unsuitable for tensioned wire fixation.

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    Area of Science:

    • Orthopedic biomechanics
    • Materials science

    Background:

    • Wire fixation is a common technique in orthopedic surgery.
    • Understanding the biomechanical properties of different wire configurations is crucial for surgical success.

    Purpose of the Study:

    • To evaluate the tensile load-to-failure for various configurations of 18-gauge stainless steel wire.
    • To determine the impact of bending and knotting on wire strength for fixation applications.

    Main Methods:

    • Biomechanical testing of six wire groups using an Instron universal testing machine.
    • Groups included intact wire, repeatedly bent wire, and wires with simple, square, loop, and twist knots.
    • Tensile load-to-failure was recorded for each group.

    Main Results:

    • Intact wires failed at a mean load of 67 kg.
    • Wires with bends, simple knots, and square knots exhibited similar failure loads, with breakage occurring at the knot.
    • Loop and twist knots failed at significantly lower loads.

    Conclusions:

    • Bending 18-gauge stainless steel wire does not substantially reduce its strength.
    • Knotting can create stress points, initiating wire breakage.
    • The square knot offers the greatest strength among tested knots; loop and twist knots are not recommended under tension.

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