As a person who has had a knee operated on (thanks to a friendly football game amongst brothers), it is worth getting it fixed. Had I not gotten it done, I wouldn't be as active as I am now. But...I fear when I am older it will have issues since I can hear it crack everytime I move it. So unfortunately they can't fix your joints perfectly, but at least she can enjoy good mobility while she is young if she gets it done. And hopefully the new system will be here before we get old.