Femur fracture, Knee pain after surgery

Hi all,
I am 21 years old, I had my femur fractured 10 years back. Doctors operated and fixed a rod. They told me I do not need to remove my rod ever in life. But now I am having knee pain if I walk too much or if I sit under air conditioner or expose my leg to heat. The pain starts from knee and slowly spread in complete leg. I do not want to go to doctor becuase I ams ure for earning extra money they will say you need to remove your rod etc. Can anyone help me and I also wanted to ask can this pain turn worse or turn into cancer etc??? Is there any other way of getting rid of this pain instead of getting operated?
Thanks

[PedroH]

You may have soft tissue injury in your knee.Quite often someone who has had a femur injury walks with a different gate which will also cause pain in the knee &or hip .But there is also a chance that a screw has given way.The long and short of it is that you need an xray -it is highly unlikely that after 10 years your pain has anything to do with hardware if its all in tact & no,pain doesn't turn into cancer.Good Luck to you!