How long does it take to get osteoarthritis in the knee joint? I had surgery one year ago and was told I do but the surgeon says I don't?

Osteoarthritis. The development and progression of osteoarthritis is dependent on wear and tear, nutrition, weight, activity and joint abuse/overuse.In the wrong setting or environment your progression may be accelerated.
Depends many factors. The age of patient, prior knee injuries, extent of surgery, physical fitness, co-morbidities and level of use and rehabilitation success.