This is a compound bone fracture.
Koichi had a bad car accident last year. Not only did he break his legs, but he lost his head and now he's a robot.
It’s been a while since we all got together. How have you been? Things are pretty much the same with me except I broke my pinky toe. Lol.
When your bone gets folded like paper, or something, you can bet you have a broken bone or fracture.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. Just watch out because こつ is shortened to こっ here.