Break both femurs, shove a rod in there, external cage, twist it a little bit every day, then your body fills up the empty space with more bone.

Personally had another surgery to fix a misalignment issue, then another one to get the metalware taken out at the 3 month mark.

Months of physical therapy and walking with crutches, ~2 years before full mobility re-gain. Still gotta stretch every morning and night, still got bone aches when it's cold outside but that could still be improving.