I fell from a scooter today. i fell left ways and i couldnt stand up or move for sometime.it felt like my knee was rotating or giving away. i could later move without any problem i could bend,flex and straight raise my leg without pain. but i could not get off a scooer from the left side. even now i have zero pain. what do you think has happened? there is no swelling. but i still feel like my knees are giving away.