This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
What would be the most reliable test for an acutely injured knee of a 27-year-old athlete - 
Select and explain. 
A. Anterior drawer test, B. Posterior drawer test, C. Lachman test, D. Steinmann test
C: Lachman test
Answer: C: Lachman test 
Explanation: The best test for an ACL injury is Lachman's test

"When 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