Broken legs and recovery.
This article paints a pretty grim picture but these injuries happened at speed with baby horses.
I knew a horse a decade or so ago 'Patches' (A quarab gelding) who broke his leg kicking a stall wall. It cost his owner 3000.00 in vet bills but he was good as new afterwards. I didn't think to ask what sort of cast/sling if any they used.
How many others here personally knew/know horses who broke their legs, got proper vet care, recovered and went back to work.