Okay here goes.
I am 42 soon to be 43. When I was 26 I noticed I had pain in my right knee on the inside{distal}. I was a runner and had just had a baby. I went to the dr they said slack off on the running so I did.
When I was 27 my husband was killed in a military accident and my bad back started acting up again. It was put down to muscles spasms, "don't worry".
I remarried at 29 and right before my 30th BDAy my back popped. I had a ruptured disc so that was causing the leg pain.
In 1995 before my 34th Bday{i spent it in hospital having surgery} I went to dr in feb. I told him I was having trouble walking and the pain was horrible. He said nerve damage from back"don't worry" Well I went back 3 months later and told him I think I have a tumor and could feel it. He laughed but did referr me to an Ortho dr.
He ran new MRI of back but when I went back 2 weeks later for discussion of MRI he observed I was walking worse. He took Xrays and said "Oh my GOD you have a tumor on your femur!" It was a giant cell tumor which usually strikes females between 20-40. I went to San Antonio, we lived in LA Ca at the time {military} and was given a choice of total amputation , above the knee, a cadaver bone which would have meant 1 year in a cast and possibility of rejection and infection, or this new limb salvage prosthesis. I chose the LSP but it has been a long nightmare.
Anyway it took my tumor about 8 yrs to show up on xrays and for it to be felt both touching and painwise. My knee was also swollen, still is due to complications of LSP but I had never in my wildest dreams thought I would have a tumor. It was benign which is a plus but it was so large it was the bottom part of my femur and I was walking around with a broken leg, hence the pain. NOt broken in traditional terms such as a fracture.
Good luck with your leg. I didn't tell you this to scare you but I wish I had known about the possibility of this when I was 26 as then the surgery would have been minimal, scooping out the small tumor and packing with bone cement opposed to amputating due to damage to bone.
Bonnie