<prompt> What would be the most reliable test for an acutely injured knee of a 27-year-old athlete -Anterior drawer testPosterior drawer testLachman testSteinmann test  <response>: The best test for an ACL injury is Lachmans testWhen the preoperative examination no anaesthesia was analysed for patients with isolated ACL injuries, the authors found that 98 of the Lachmann tests, 54 of anterior drawer tests, and 27 of the pivot shift tests were positive. When the examination under anaesthesia was analysed for these isolated injuries, authors found that 100 Lachmann tests, 81 of anterior drawer tests, and 100 of the pivot shift tests were positive. -- Evidence base sports medicine 