I Have Had Progressive Knee Pain For The Past Few

i have had progressive knee pain for the past few months, not severe but getting to feel like a chronic condition rather than something that is getting better. it started with what feels like bruising on inside of the knee. I do a lot of dog walking on rough ground and think this may be aggravating it. i am 57 , been through menopause, no probs, but suspect maybe either arthritis or osteoorosis, not sure which is most likely or both?? Any clues ?