I just got done playing an intense basketball game and some time during the game I must have hurst my back with an awkward twist or something. During the game the pain wasn't too bad but after driving home for 15 minutes I could barely stand up when I got out of the car. Whenever I walk on my right foot there is a sharp pain in the lower right side of my back. I am 17 years old and in good health. Any ideas of what this is and how worried I should be?