Knee surgery did not end my pain so I asked for PT. My PT said my knee problem was caused by weak muscles that do not keep my joints in good alignment. Yet I cannot be trusted to do boring, time-consuming exercises that never end. When I was an OT I did not know how mind-numbing exercise is when it must be done every day until a client with a chronic condition dies.
I find it easier to incorporate an exercise into a daily activity than to add another exercise to my to-do list. In the 13 years since my stroke I learned I will do 3 to 5 repetitions every day IF I use a familiar object as a memory aid. I call doing a few reps every day forever a mini-exercise. Here is one of the mini-exercises I do daily because I do not want knee replacement surgery.
My PT had me do lunges to strengthen my knee. My knee wobbled left or right (red arrow) as it bent because my hip muscles are weak. After a few reps hip muscles keep my knee lined up with my foot (green arrow). I chose the toilet to prompt me to do lunges. On his TV show Dr. Oz showed how much water sprays out when a toilet is flushed so I got in the habit of lowering the lid before I flush. I have to wait for 10 seconds so I may as well do 10 lunges.
I do this at least twice during my morning routine.