My symptoms.... back,hips,knee become painful on standing for long periods and normal physical activity such as walking, climbing stairs. I have always been very physical. My legs become very stiff on sitting. I don t take any medications. My back was diagnosed with osteoarthritis about 10 years ago but I avoid actions which activate it. My legs hips and knee have become challenging in the last six months. I push through the pain through determination. I suspect that the hips and knee are also osteoarthritis . My question is .Could this be anything else?