Maybe, but this was my experience with my knee when I injured it.
I was in Karate class at school, attempted a hard kick, fell backwards and attempted to use my right leg to catch the fall, hyperextended, heard a crack and fell down. It hurt like hell for 20 minutes before I told the teacher I'd be fine. Wrong, it got swollen real fast. (December 2004(
When I get home, I go on the internet and self diagnose myself with a torn ACL, but my parents just tell me to shut up and say I have no idea what I'm talking about.
So, we take it to my pediatrician the next morning, she says it is just a sprained knee and to take it easy. I don't take the advice and go on the school trip that I had been waiting for the last 3 months to go to. We did about 5-6 miles of walking that day.
Eventually after 2 weeks and 28,000 mg of ibuprofen later, swelling goes down, pain goes away, until 3 months after the initial injury when we're playing dodgeball in gym. I tried to avoid a ball coming at me, my knee slipped up and I fell down again. (February 2005)
It hurt for about 2 weeks, took it the other doctor at my pediatrician's office, he says its a pulled hamstring. My uncle who's a doctor made the same diagnosis as this guy and told me my diagnosis is not correct.
Okay, so take it easy for a month. Next month, Varsity Tennis season is opening up. I play the season for 3 months before tweaking it during the semi-finals. (May 2005)
Finally, we get a name and number of an orthopedic surgeon. We take it there, he orders an x-ray and a MRI, moves my knee around a bit, and then a week later, calls me and says I have a torn ACL and a torn lateral meniscus.