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This video demonstrates an increase of external rotation at 90° of knee flexion (compared to 30°). This indicates a combined posterolateral and PCL injured knee.After completion of the dial test at 30°, it is repeated at 90° (if it is found to be positive). In an isolated posterolateral knee injury, there sould be a slight decrease in external rotation compared to 30°. However if there is a concurrent PCL tear, there will be an increase of external rotation at 90° compared to 30°.http://www.sportsdoc.umn.edu
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