@Museek I fell on black ice and landed directly on my kneecap a couple of years ago so I know how much that hurts! I thought because I could walk but couldn't bend it, I had just bruise the bursa behind my kneecap so limped around straight-legged for 2 wks. When things didn't improve, I finally went for an x-ray and learned that I had fractured my kneecap and fibula!
Spent 16 weeks in an immobilizer, but fully recovered. If you think you need an x-ray, go for it!