4. With his knee flexed at a right angle, a football player was tackled from beh

Question

4. With his knee flexed at a right angle, a football player was tackled from behind, driving his tibia in the anterior direction under his femur. The player described the sensation as a slight pop and then the feeling that his knee gave out as he was tackled, followed by pain. The player said the pain was too great to place weight on. When the trainers examined his knee, they observed a positive result of the anterior drawer test. a. What is the anterior drawer test? How is it done? How does a positive result present? (3) b. What kind of injury likely resulted from the tackle described above?(1) c. What does ACL stand for? Why is it named such? (Hint: break down the name like we did for naming muscles) What are its attachments? (3) d. What are the functions of ACL during knee movement? (1) e. What is another knee structure that could be damaged in this kind of knee injury? (1)

Explanation / Answer

1) Anterior Drawer test: it is the test to evaluates the anterior cruciate ligament, and it is shows of the anterior cruciate ligament tear, and it is performed by placing the knee in the 90 degree of flexion with the patient laying in supine position and then the foot is stabilized on the table and then grasp the posterior aspects of the tibia over the upper calf muscle and pull forward with a steady force if the tibia bone pulls forward more than normal the test is positive. 2)ACL ( anterior cruciate ligament ) injury. 3)ACL stands for anterior cruciate ligament ,ACL it is named so because a ligament in the knee that crosses from the underside of the femur to the top of the tibia, and these ligaments are one on either side of the knee and they cross each other in front of the knee as it is called cruciate ( crux means cross in latin). its attachments are tibial attachment is in antero posterior axis of tibia and femoral attachment is in the longitudinal axis of femur. 4)Functions of ACL during knee movement: the ACL is attaches to the back of the thigh bone and the shin bone at the front and prevents excessive forward movement of the shin on the thigh bone, and it prevents the excessive anterior translation of the tibia on the femur, and the acl also helps protect the knee from the excessive valgus forces. 5)The other structure of the knee which are damaged along with the anterior cruciate ligament are articular cartilage , meniscus and other ligaments.

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