I'm just saying that every lower body movement will involve the knees at some point, which is the reason for most people avoiding squats.
Leg extensions are often cited as an alternative, but some, especially machine leg extensions as found in the gym, can exacerbate existing knee problems.
In my experience as a trainer, I have worked with clients with various knee issues, including arthritis, and every single client has been able to do some variation of a squatting movement without aggravating the knee condition.
I am not sure why you found my answer to be offensive, but perhaps more information on your particular knee problems would be helpful.
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