Awful news from Tony Hawk -- the skate legend says he suffered a broken leg on Monday ... and it's so severe, he may never get back to 100% again.
The 53-year-old opened up about the setback in a lengthy Instagram post on Tuesday ... saying he's going to do whatever it takes to get back on the board again -- but it's not going to be easy.
"Yesterday sucked," Hawk said. "I broke my elbow 20 years ago and managed to make a full comeback; this recovery for a broken femur will be much harder because of its severity (and my age).