What is the first name of this knees surgery?

The doctor told me, but I forgot. He said that there are 3 diffrent names for it.
my knee cap are crooked, and he has to lengthen my muscles to straigten them out.

I need the heading, because I need to research the surgery. Or if you have had this done, please give an account me about it!! Thank you so much!
Answers:
The doctor knows best.

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