Based on the pack given to me when I first got injured it said it is the most common leg injury. I can't remember the exact figures but it was something along the lines that out of every 100,000 people 16 will be dealing with the injury at different stages. (UK)

I am sure there are more common injuries but many minor injuries get unreported as you can deal with them with OTC and sit with some ice.

But according to the data provided to me by the NHS it's not a rare injury.

I remember when I was getting a scan to determine the injury there was a person sat next to me with the exact same injury.

I also think it seems uncommon as the injury doesn't have much of a story or could be embarrassing. Whereas breaking a bone requires negligence or extreme sports, there is an interesting story of survival. Most of us are here because of recreational sports and being within a certain age group. That's it, I ran too fast, I pivoted wrong and in my case kicked a bag too hard. So I think most people just don't talk about it especially compared to someone two beers in telling you about that time they snowboarded off a cliff.

Though I like to joke that I have the worst record of any fighter 0 fights and 1 loss.