No one ever thinks about their quadriceps tendon or patella tendon until they have injured them. They are integral to human functioning for walking, climbing, standing up from a chair or the ground, and running. As an  orthopedic surgeon, I am privileged to see what unfortunately can happen to someone who tears their tendon. It makes me appreciate the human body so much more when I see the disability of this injury. A quadriceps or patella...