Hello i'm a college track sprinter, my knee is giving out as i walk, and it hurts a lot. doc thinks it's meniscus but xray and mri are both normal?

Knee pains.: The knee is a complex joint with many components that can cause pain. The meniscus is a common cause of pain but other cause may include chondromalacia (cartilage on the underside of the knee cap), ligament irritation or injury to the knee, as well as a iliotibial band irritation. You will need to see a physical therapist who can better isolate the pain and then help with rehabilitation.