Charles A Jenkins D.V.M at Los Alamitos Racetrack in Cypress, CA says:
Bedsores first and foremost are open sores on the horse's legs. These sores can become chronic pressure ulcers that repeatedly become infected and difficult to heal so resolving them quickly is important. Once healed, the most important protocol is protect the joints to prevent the bedsores from reopening or coming back. Certainly, bedsores can be avoided if a designated rest area such as a stall can be deeply bedded. When an owner does not have the option of giving the horse a deeply bedded resting area, then protection from further injury is needed.