What did I do to my knee?

I slipped and fell. My leg was kind of behind me and it folded when I fell. I landed with my leg in the formation it would make when I crouch, ie the back of my calf was touching the back of my upper leg. I landed on the inside of that leg and ever since I have had severe pain on the inside of my knee. It hurts to bend or straighten it, and I can’t walk properly. I have an appointment with the orthopedist on the first of October but I’m just curious if anyone went through something similar. I’ve been reading about what it’s like to tear your meniscus and my symptoms match about 50% of what people have said.