after trauma to the knee the patient examined in prone position and there is increased external rotation of the knee in 30 degree and 90 degree flexion thus he has

after trauma to the knee the patient examined in prone position and there is increased external rotation of the knee in 30 degree and 90 degree flexion thus he has:

• a. PCL injury
• b. PCL and posterolateral corner injury
• c. meniscal tear
• d. ACL injury

(b)