When I was 22, I also broke my tib/fib, but in 11 places, requiring 6 pins, one long piece of wire, and a small plate to hold the parts together. I was in a hip cast for 5 months, then a calf cast for 8 months. Took me 2 years after getting out of the cast to start jogging in soft sand. My lower leg was skinnier than my arms.
Oh, I'm 63 now, still 5'11", but now a porky 150 lbs., and cannot run ONE step, now for 5 years due to a sprained ankle (or detached tendons, as said).