I'm fourteen years old. I'm a girl and I weigh around 95 pounds. I'm 5 feet tall and I don't have much medical history except for I have a flat arch for my feet and a slightly sway back. I've never broken a bone but I constantly sprain my ankles. Anyways, so I dance and I do a lot of kicks. Recently whenever I lift my bent leg up past ninety degrees and then I extend it until its straight I feel this weird pop in my knee and a vibration continues down my calf. It tingles from my knee down. Why is this?