Arthritic problems happen with my knees too. They either want to lock in place or resist straightening and instead each time I begin to walk they play a game of tag with the nearby nerve. I twist and yelp until those two reach a consensus that allows me to walk. The knees are a chronic pain. No. Knee replacement is not an option I consider.
There is also the occasional severe inflammation of a joint. This can happen anywhere in the body, though hip, spine and foot have seemed to produce the most pain and resultant yodeling. Thank goodness we live in the boonies. If we lived in a town the neighbors would think himself was committing murder at our place. He isn't. And hasn't. At least yet.
Actually he is beginning to understand the joys (gag!) of painful joints. My tough guy is getting older right along with me and though he is less noisy about it he has started to feel it. Are there yodeling duets in our future?
(Getting old sucks. The alternative isn't so great either.)