Hey. I have had knee pain for the last 2 and a half years. i am 18 years old. my knee is swollen and changes siz on a regular basis. i have been back and for between my gp and my physiotherapist but my physio has never seen anything like it. i am constantly on my feet and struggle getting up from kneeling. i have pain when playing sport and when im relaxing. my knee does constantly pop and click. anyone got any ideas that would help me would be great.