Had 30% of left medial meniscus removed... pt , cortisone , rest did no good . always limp. could limp damage other parts of knee? whole knee hurts.

Yes, if prolonged: Given your age arthritis is high on the list of reasons for you to have continued knee pain. Meniscal surgery rarely is helpful in the absence of mechanical symptoms such as locking or clicking of the knee with attempted motion when arthritis is present. A continued limp can place undue stress on other areas of involved knee as well as other joints such as the hip and ankle or even low back.

Yes: you have an arthritic knee. It's comparable to the brake pads in your car wearing down, requiring a swap out. Here are a couple of resources: http://www.aaos.org/news/aaosnow/apr12/clinical17.asp http://www.amazon.com/Heal-Your-Knees-Prevent-Surgery/dp/1590771249