This Will Put The Cat Amongst The...
News1 min ago
No best answer has yet been selected by shazbang. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Been there, had the op. It is likely to be a small flap of cartilage that gets in the way of the kneecap, termed a meniscus tear. It won't go away without removal - normally by keyhole surgery so no big scarring.
http://www.kneeguru.co.uk/html/steps/step_04_meniscus/tear_types.html
Link to all things you 'kneed' to know. I gather it is a common sprots injury but willalso happen just because it can - wear and tear and all that.