International Sports Sciences Association (ISSA) Trainer Practice Exam

Which of the following movements is NOT possible at the knee joint?

1. Extension

2. Flexion

3. Adduction

4. Rotation

The correct answer is: Adduction

The knee joint primarily functions as a hinge joint, allowing for specific movements. Extension and flexion are the primary movements at the knee. Extension straightens the leg, while flexion bends the leg, which are fundamental actions performed during walking, running, and other motor activities. Rotation can also occur at the knee, particularly when the knee is flexed. This slight rotation allows for some level of mobility and adaptability of the joint during various movements. Adduction, however, is not a movement that typically occurs at the knee joint. Instead, adduction primarily happens at the hip joint, where the leg moves toward the midline of the body. The knee joint's anatomy and function are primarily focused on flexion and extension, with limited ability for rotation, but not adduction. This anatomical limitation is critical for understanding how the knee interacts with other joints and the overall biomechanics of the body during movement.