You Have Damaged Your Knee Playing Soccer, Specifically the Cartilage

Multiple Choice

You have damaged your knee playing soccer, specifically the cartilage structure between the bones called the meniscus, and no tissue other than the cartilage has been damaged. Your doctor tells you that it will be many months before you might be able to return to soccer after surgery. What is the best explanation for this?

A) Bone has to re-grow in the area, and that takes a while.
B) Nerves to the knee have been damaged.
C) There is slow healing because of a normal lack of blood supply to cartilage.
D) Excessive inflammation inactivates the knee mobility for many months.
E) Blood vessels have been destroyed, so the cartilage is not receiving enough nutrients.