Question

Mark turned quickly, pivoting on his right foot, while he was playing basketball. He felt a sudden, sharp pain in his knee and found his leg would not support him well. When he tried to walk off the court, his knee wobbled sideways. Based on this evidence, which of the following has he most likely injured?

Answer 1

all of these seem to be the right answer except for A!! HELP !
He has broken the femur and it can no longer maintain proper muscle tension to support his weight
He has injured one of the tendons or ligaments that help keep his knee in place, connecting it to the surrounding muscle and bone.
He has injured the quadriceps muscle that is responsible for moving his leg up and down as he walks or runs.
He has torn the cartilage that cushions the interior of his knee, keeping it aligned with the bones in his leg.

Answer 2

I would agree that A is not the correct answer.

Lets skip the knee ones, and consider the quads. Look at where your quads are on your own body. Walk across the room and figure out when you flex that muscle, how your body moves. Now picture what it might look like if you couldn't contract that muscle - how would you walk?

In short, I think the answer has to do with the knee, but to distinguish between the two options you still have left, please consider the description of what he was doing when the injury occurred. There is a very characteristic type of injury that occurs with a planted foot and a turn - it's a common injury with (American) football players. The correct answer is supported by the type of movement experienced by the knee - sideways/lateral movement.

Does that help?