play tennis and my knee has been hurting for about 3 months. It is not bad and it doesn't hurt when I walk .It only hurts when I step down from something or when I hop on it or pick something up with my leg .It also hurts when I step into the ball when playing tennis. It hurts to make me stop but then I carry on with my activity. help
How old are you? My experience of sudden knee pain gives me the following question. Did you casually jog for about 20/ 50m and get a stabbing pain in your knee? If so, it could be an indication that you have a hip problem. This is what happened to me and I ended up with a hip replacement (no big deal). Whatever, it needs checking out. Bonne chance :)
I had a similar problem years ago through playing too much badminton.
The physio told me that all the stuff that makes up the knee joint wasn't strong enough resulting in inflamation from movement where there shouldn't have been any.
Ultrasound, heat treatment, massage , strengthening exercises and, most importantly, a month away from sport, cured it.