About three weeks ago, on the same day that the night temperatures in L.A. went down into the fifties, I quite suddenly discovered that I had excruciating pain emanating from the crook of my left knee. It was particularly painful when I was going down a flight of stairs or raising myself from a seated position. I was concerned that, if things got any worse, my trip to Yucatán was at risk.
So today I explained the situation to my endocrinologist, who serves as my primary care physician. She recommended that I see an orthopedic specialist. When I returned home, I made an appointment to see the surgeon who replaced my left hip in 2002 with a titanium implant.
As of now, I have made no reservations for my trip: I expect I might have to delay it for a month or two. The good news was that my endocrinologist said the condition was probably not the beginning of a steady deterioration in my ability to walk or use stairs. My fingers are crossed that, either the condition will heal by itself, or some procedure could effect healing of the knee.
Good luck with it, Jim.