You're welcome... I'm not a vet, just a horse owner... and so that's just my rough translation of the factors ~I~ know of, I'm sure there are more. I should have stayed at a Holiday Inn last night. ;~D
Also the horse's disposition in rehab: given their breeding, they're all keyed-up and really strong. I understand that figured into Ruffian's sad story.
My reason for asking - as a CAT scan tech I was involved in new trauma injury imaging of 'submarining' years ago. That's when a driver just wears a shoulder belt to avoid a ticket. What happens is when you crash, since your not wearing the lower belt - you slide under the shoulder belt. Your knees impact the lower dashboard which results in the energy being transferred to your femurs and consequently pushing your hip sockets into your pelvic cavity. Anyhooz, a sub-specialty was created in orthopaedics just for this injury. Imagine every screw and plate in your garage and mix in colon and bladder contents to deal with. Now I know about horsies as well. Thanks again.