APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -At the knee joint, most functional activities require up to 120 degrees of knee flexion, rather than the full 135 degrees, however, virtually all functional activities require full knee extension.

Detailed explanation-2: -The dial test at 90° of knee flexion in the supine position is performed with the knee flexed at 90°, the femur stabilized and an external rotation force applied to the tibia through the foot and ankle. The amount of increased external rotation which occurs compared to the contralateral side should be assessed.

Detailed explanation-3: -On average, most individuals have around 0 degrees of knee extension (a fully straightened knee) and 135 degrees of knee flexion. This can vary based on how tall you are and how big your muscles surrounding your knee are.