My knee hurts when I tried to jump rope, I have complete ACL tear...

I have a complete ACL tear on my left leg, got it about 6 years ago. It has never been repaired. It never hurts, only gives out sometimes when I go too fast down stairs or walk too fast. Yesterday, I started to jump rope, and within 5 jumps, my left knee hurt. I stopped jumping for a few minutes and tried again, and it instantly hurt. I tried again today, and again, instant pain. Any ideas? Thanks! Erica

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