What Causes Lower Back Pain And Painful Indentation On Kneecap?

I was in a car accident. felt ok now 6 days later my knee is giving me problems. I must have hit my knee on the console but at the time it was fine. Yesterday I started having pain in my lower back. got worse through the night and my leg began hurting as well. When I move my leg it sends a shooting pain to my lower back. Knee has a indentation on the knee cap and feels like small pieces of gravel grinding on my knee cap. Assuming the indentation is where I hit the console