I am very sorry, jnewk
I stepped off a curb when I was 18 and my leg just went, no known reason. Fortunately, I didn't break anything and was just embarrassed. I now know the cause was MS.
I have not broken my leg but several years ago I did shatter my left ankle due to a fall off the bottom step to my garage. On the left side of the ankle I have a plate with 3 or 4 screws and on the right side of the ankle I have 3 pins, connecting all of it is wire. I was non-weight bearing for 7 weeks and it took Physical Therapy and alot of work on my own to get my mobility and endurance back.
Best wishes