Having gone for a run yesterday(17 miles) I felt alright until I stopped! I then had a 'sharp' pain at the side of my right knee! After a short while it eased off and was fine this morning. However after being out this afternoon walking on it for a while it has come back. Not too bad whilst walking but if I press hard on the bone on the side of my knee, I get a sharp pain. I haven't a clue what it is!Any ideas, or suggestions as to ease it would be much appreciated. Do I just need to buy a knee support?