Knee Ligament Injuries
A 28-year-old professional rugby player sustains a hyperextension-varus injury to his right knee during a tackle. He reports immediate instability and difficulty weight-bearing. Examination reveals grade III laxity to varus stress at 30 degrees flexion with a firm endpoint at 0 degrees. External rotation of the tibia at 30 degrees is increased by 15 degrees compared to the contralateral side. The dial test at 90 degrees shows no asymmetry. MRI confirms isolated posterolateral corner injury with an intact PCL. Regarding the anatomy and biomechanics of the posterolateral corner:
Mark each as TRUE or FALSE
The three main static stabilizers of the posterolateral corner are the lateral (fibular) collateral ...
The dial test assesses posterolateral rotatory instability; increased external rotation at 30 degree...
The LCL originates from the medial femoral epicondyle; the popliteus muscle is the primary static st...
The LCL is the primary restraint to varus stress at 30 degrees of knee flexion; it provides approxim...
Dynamic stabilizers of the posterolateral corner include the biceps femoris, iliotibial band, and la...
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Click T (True) or F (False) for each option