Your doctor will ask you questions about the injury and your symptoms.
Your doctor will do a clinical examination of your knee to assess the structures in your knee joint.
Your doctor may refer you for an X-ray or MRI (magnetic resonance imaging) scan to assess your knee. The diagnosis of an ACL injury can generally be made after taking a history of the injury and examining the knee alone. These investigations, however, can help to determine if other injuries of the bones (fracture), menisci or other ligaments have occurred.