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Positive Lachman test in ACL Injury Here is an exam of a patient under anesthesia with an ACL tear. You’ll notice the looseness of the knee during the exam. That causes the knee to buckle during running and cutting activities. via Dr. Jason Hammond @dr.jasonhammond #Lachmans #test #ACL #Knee #Injury #Positive #ACLTear #clinical #video #PhysicalExam #Sports #Ortho #anterior #cruciate #ligament #msk