Which injuries do serious crashes cause, the damage a structural repair has to prevent next time?

NHTSA's CIREN files code 21,398 injuries in 2,104 studied crash cases from 2005 to 2016, of which 4,504 were serious or worse; the chest (28.4%), the lower body (25.3%) and the head (16.9%) account for most of them.

Thorax (chest)1,280

Lower extremity1,140

Head762

Spine468

Abdomen and pelvic contents460

Upper extremity290

Neck56

Face48

What it shows: Thorax (chest) is the largest at 1,280, followed by Lower extremity at 1,140; the smallest shown is Face at 48.

Source: NHTSA, Crash Injury Research and Engineering Network (CIREN) public data files · data from 2018