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Finger Collateral Ligament Stress Test Ulnar collateral ligament stability can be tested at zero and thirty degrees of flexion by applying a valgus force to the finger. Radial collateral ligament stability can be tested at zero and thirty degrees of flexion by applying a varus force to the finger. Laxity indicates a partial or complete ligament tear. Video via @open_michigan #Finger #Collateral #Ligament #Stress #Test #PhysicalExam #clinical #video #sports #msk #orthopedics #Hand