My teenage son recently injured his knee while playing sports, and the doctor suspects it's an ACL injury. His knee swelled up right away, and he's having trouble walking without pain. We're waiting for further tests, but as a mother I'm worried about whether he'll need surgery or if physical therapy might be enough. Has anyone gone through this with their child? What questions should I ask the orthopedic specialist during our appointment, and how can I help my son recover as safely as possible? #acl