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This video tutorial discusses the lever sign or lachman test used for diagnosing anterior cruciate ligament (ACL) rupture. A study involving 400 patients found the test to have 100% sensitivity and specificity, making it statistically perfect. However, there may be a high risk of bias as the authors are the founders of the test. Another trial in 2015 showed a sensitivity of 94% without anesthesia and 98% with anesthesia. The specificity was not measured. To conduct the test, have the patient in a supine position with legs extended, place a fist under the calf, and apply moderate downward force. Links to both studies are provided in the description.