25/04/2026
You should always trim the hoof flat. Right?
There has been interesting debate on farrier discussion pages about trimming methods that create a non-level or non-flat solar surface. Many of the comments mocking the method do so from a lack of understanding of what is actually being proposed, and from a lack of understanding of its genuine peer-reviewed validation through the work of Dr Hagen and colleagues on F-Balance, centre of pressure migration, and hoof loading patterns .
The mistake is thinking the method is simply “trimming the foot wonky.”
It is not.
The hoof is not a flat block of horn. It is a three-dimensional deformable capsule. It loads in the sagittal plane, the medio-lateral plane, and the transverse plane. That transverse plane matters because it is where torsion occurs. When the limb loads off-axis, the hoof capsule does not simply become higher on one side and lower on the other. The dorsal capsule, heels, quarters, bars, sole, and bulbs can rotate in relation to each other. In other words, the hoof can twist.
That twist is not random. It is the result of repeated loading over time.
This is why a hoof can appear distorted in ways that do not make sense if you only look from the bottom and ask, “Is it level?” A sheared heel, displaced bulb, flared wall, upright quarter, migrated heel, or distorted bar is often not an isolated feature. It is part of a three-dimensional deformation pattern.
This is also why simply trimming the solar surface flat can be misleading. If the capsule is torsioned, then making the bottom look flat may actually preserve the twist. You may have made the foot visually neater, but you may not have addressed the mechanical distortion that created the morphology in the first place.
Three-dimensional trimming methods such as F-Balance are trying to read that deformation pattern. They are not saying, “make the foot uneven.” They are saying, “stop assuming the distorted foot should be trimmed to an artificial flat plane.”
The functional sole becomes important because it gives information about how the foot has adapted around load. The sole, bars, frog, wall, and heel structures are not decorative landmarks. They are the visible expression of a capsule that has been loaded, deformed, reinforced, and grown under mechanical demand. When a practitioner follows the functional sole correctly, they are attempting to respect the internal organisation of the foot rather than imposing a cosmetic level surface over the top of it.
The aim is not to create imbalance. The aim is to remove the distortion that is preventing the capsule from untwisting.
That is the bit many people miss.
If a hoof has torsioned under repeated off-axis loading, then the trim has to allow the foot to load in a way that encourages counter-rotation back toward a more neutral state. This does not mean forcing the foot into a shape. It means removing the parts of the trim plane that are maintaining the rotational distortion, while preserving the structures that tell you where the functional foot actually is.
This is why the method can look strange to someone expecting a flat solar surface.
But strange does not mean wrong.
A twisted structure may need a non-flat intervention to return toward a less twisted state. That is basic mechanics. If you only assess the finished trim by whether it looks flat on the bottom, you have already reduced a three-dimensional problem into a two-dimensional one.
Dr Hagen’s work is important here because it showed that trimming strategy influences hoof loading patterns and centre of pressure migration. That matters because it validates the central principle that farriery changes are not merely cosmetic. They alter how force travels through the foot. F-Balance is not just an internet trimming fad. It has been investigated in peer-reviewed work looking at the relationship between trimming, loading symmetry, and pressure distribution.
That does not mean every person claiming to use a three-dimensional method is doing it correctly. It does not mean every non-level trim is justified. It does not mean the foot should be randomly sculpted because someone has learned a few new terms.
But it does mean the mockery is often misplaced.
The real question is not, “Is the sole perfectly flat?”
The real question is, “Does this trim reduce pathological torsion, improve the spatial relationship of the capsule to the limb, and allow the hoof to load more centrally over time?”
That is a much harder question.
And that is exactly why these methods require understanding, not ridicule.
Webinars for further education
The physics and biomechanics of medio-lateral balance…
https://equineeducationhub.thinkific.com/courses/landing
F-Balance
https://equineeducationhub.thinkific.com/courses/f-balance-webinar
Understanding hoof morphology and introduction to 3D trimming methods, webinar with the Hoof Architect
https://equineeducationhub.thinkific.com/courses/understanding-hoof-morphology-1
