Hyperextended Knee.. Continued Question?

I finally found out what my knee condition was called, but throughout all my research all it shows it hyperextended knees were cause from a bad fall or rough impact, i have never had a bad fall or broken bone so what has caused this, and are there any long term effects.?
Thanks Isabella
Update: Im not "babying" anything, im curious on how it got this way when most people get it from injuries and mine just appeared overtime. holy
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