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Table 1 Lauge-Hansen SER Stages, where each stage of injury is in addition to the prior

From: Diagnostic capability of dynamic ultrasound evaluation of supination-external rotation ankle injuries: a cadaveric study

Stage 1 AITFL
Stage 2 Fibula Fracture (Fx)
Stage 3 PITFL or Posterior Malleolar Fx
Stage 4 Deltoid or Medial Malleolar Fx