Since the foot turns over each time the horse takes a step, it follows that successful treatments for founder involve stability, support and enhanced turnover. As an aside, medication and mechanical treatment get a lot of the credit for stabilizing horses that rightfully belongs to Nature. From a mechanical standpoint, stability of P3 is achieved by the application of some kind of mechanical pressure to the frog. Obviously, there's a thin line between stabilization and support. Assuming that the horse, for whatever reason and by whatever means, has stabilized, the most important factor becomes enhanced turnover.
Turnover is the fourth phase of motion.
Additionally, turnover can be facilitated to a lesser degree by the farrier's choice of shoe configuration and by various forging methods. All other things being equal, the most important factor influencing turnover is the placement of the shoe on the foot because the length of the phalangeal lever is determined by the distance from the coronary band to to the breakpoint of the shoe, not by the distance from the coronary band to the end of the hoof capsule. For this reason, the wall is not considered, other than as a limiting factor, in the placement of the shoe on the foot. In my experience, the most effective means of mechanical treatment of founder consists of a pressure bar, set under. For this reason, many veterinarians are reluctant to prescribe their use and instead prescribe methods that are not as effective, but do not have the potential for damage - and litigation.