Lauge Hansen Redone: A Cadaveric Study Revisiting the Original

Methodology

John Y. Kwon, Leah Gitajn, Phillip Walton, Timothy Miller, Edward K.

Rodriguez, Paul Appleton

Lauge Hansen Redone: A Cadaveric Study Revisiting the Original

Methodology

John Y. Kwon My disclosure is in the Final AOFAS Mobile App. I have no potential conflicts with this presentation

Purpose

• To recreate Lauge-Hansen’s experiments for the supination external rotation (SER) mechanism

• To determine whether the predicted sequence of bony and soft-tissue injury are reproducible using his originally described methodology.

Methods • 10 fresh-frozen above knee

amputated specimens were utilized.

• The foot placed in position of neutral dorsiflexion, supination and axially loaded.

• External rotation was applied manually per Lauge-Hansen’s description until bony and/or soft-tissue injury occurred.

• Fluoroscopic images and anatomic dissection was performed.

Results • No specimen demonstrated

the complete sequence of predicted bony and soft-tissue injury pattern.

• Several specimens exhibited findings consistent with certain stages of the SER injury pattern

Oblique Fibula Fx & Deltoid Ligament Injury I

Results

Results

Discussion

• Strengths: - Protocol as described by Lauge-Hansen for his

supination external rotation experiments was strictly followed

Weakness: - Only tested SER mechanisms

Conclusion

• Loading cadaveric specimens with a SER mechanism utilizing a methodology similar to Lauge-Hansen’s original experiments does not reliably produce the complete predicted sequence of bony and soft-tissue injury.

• The Theory of Mental Association may explain the continued use of this classification system despite questions of validity.

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