kippax_blueboy said:
I hate this that people bet on horses winning, celebrate but horses have died.
The whole industry stinks. If these owners loved these horses they would'nt destroy them because they broke a leg. They would look after them.
If you can be arsed to read it.
Certainly some fractures are repairable, using modern developments such as bone plates and bone screws. But many are not. The explanation is complex and relates to unique aspects of the horse.
The principles of bone or fracture repair are the same across all species. In repairing a broken bone, the broken pieces need to be stabilised, held together, a healthy blood supply is needed and any infection needs to be controlled.
If this is achieved, then the break can heal and the bone will repair and regain its structural strength. In the past, a "plaster cast" was used to stabilise the break and more recently metal plates, pins and screws have been used.
These implants can restore strength to the broken bone and allow horses to move about and, to some degree, use a broken limb during the healing process.
In most circumstances, a broken bone will heal and regain its strength in 12-16 weeks, but other variables such as infection or movement can slow or delay healing.
In human surgery, the stability of the repaired fracture can be helped by keeping the patient confined to a bed and non-weight bearing during the 12-16 weeks’ healing period.
This is vital as uncontrolled weight bearing and movement to a fracture, before it has healed, can delay recovery and prevent a bone from healing.
This is one area where equine surgery is unique. Horses are big animals that do not tolerate long anaesthetic periods. They have an absolute requirement to be able to stand on all four legs.
This means, in practical terms, the surgery or operating time should not exceed three to four hours and that immediately after surgery, the horse must wake up from the anaesthetic and be able to use the repaired broken leg to stand and walk.
This requirement puts extraordinary demands on the repair and the implants and all equine surgeons have experienced the frustration and disappointment when, after hours of intricate surgery, the horse smashes its broken leg again and bends the metal implants when struggling to stand after the anaesthetic.
To try to prevent this, strong fibreglass casts are often used to help horses waking up from an anaesthetic. Nonetheless, everyone breathes a sigh of relief when it stands, as one hurdle has been passed.
A good blood supply to the broken bones is as important as stability and controlling infection in healing a broken leg. This blood supply comes from the actual feeder to the broken bone and is supplemented by the supply to surrounding tissues, such as skin and muscle.
This is another area where the horse is unique. Below the knee or hock, the leg is composed of bone, ligament and skin. Thus the blood supply to this area is already marginal as there are no muscles and therefore no associated supply.
This lack of an adequate blood supply is important as in some severe broken legs that occur during a gallop, that supply is also damaged beyond repair, which means even with metal implants and surgical repairs to the bone, it will still not heal.
That is why some high-speed catastrophic fractures in a galloping horse still cannot be repaired.