I'm in great pain; I hyperextended my left knee this past Saturday. While walking my dog, I came across two of my neighbors (total strangers to me) hand carting a washing machine up a flight of stairs. They were thin guys in their 40's, maybe 5'6"/135lbs. I'm 70yo/215lbs/mostly out of shape. They were in trouble; the guy pushing might have gotten injured. I tied up my dog and RAN 15 yards across the lawn to help them. It was an easy assist; they were grateful. Sixty seconds later, I was walking my dog again. My left leg felt funny. I got home and took a nap. When I woke up, I was in excruciating pain as soon as I stood up! I just KNEW I hyperextended my left knee, inside ligament, probably from running on uneven grass. I'm in great pain(9 of 10) walking any distance on my left leg. When I drive, sit or sleep, I'm painless if I'm positioned correctly. Moreover, if I crouch and drag my knuckles, I can walk for short distances. Pain level drops down to 1 of 10. I took two days off and returned to work. My boss asked "Where's your crutches"? My sidekick rolls on the floor when he sees me dragging my knuckles at work. "No videos on Facebook, please!" "Government worker shuffling along at work", it might say. My wife and daughter both said I shouldn't have helped. "Look how injured you are!" "I'd do it again and again. The guy couldn't gotten killed or injured." My son-in-law said he would've helped without thinking or being asked, just as I did. He's 28yo/6'2"/strong. I have no regrets. My wife's insisting I see the doctor today. I know what he'll say. "MRI first. Then "Sir, your knee is hyperextended. We'll order you crutches and muscle relaxers." "Would you like medication for your pain?" F..k no. What would you have done? Look the other way, and keep walking the dog? Time heals. No pain meds needed.