© 2010 EQUUS-the balanced equation
STATIC STANCE (Standing square, weight distributed equally on 4 limbs). Note in the standing stance, the limb is not fully loaded.
Under this topic heading, we will explore corrective hoof trimming techniques using diagrams which show how the unbalanced trim can affect bony column alignment and palmar angle in the static stance phase, affecting soundness.
For the horse to perform under load and maintain long term soundness, it is imperative that the pastern axis be aligned. We will explore how we can achieve this by applying corrective hoof trimming to achieve a balanced trim, and by developing a well thought out plan considering the many variables and dimensions that play a combined roll in achieving bony column alignment and general hoof health.
The bony column alignment (also called pastern axis alignment or alignment of the phalanges) determines the palmar angle of the coffin bone.
The palmar angle is defined as the angle that the bottom or ventral surface of the coffin bone makes with the ground bearing surface.
The aligned bony column positions the coffin bone in a positive palmar angle relative to the ground when the horse is in the standing phase (static phase) and when the forelimb pair and hindlimb pair are equally loaded.
As the bony column alignment becomes progressively more broken back, the palmar angles lower correspondingly.
This can result in ground parallel coffin bones (0 degree palmar angles) or negative palmar angles during the stance phase.
There is a strong correlation between Palmar Angle + Bone Angle = Hoof Angle. To understand the benefit of this formula, and the implications of low palmar angles, visit our balance radiograph section.
Routine healthy hoof trimming requires subtle adjustments month to month for maintenance of a balanced trim, bony column alignment and positive palmar angles. Corrective hoof trimming of the distorted, acute or chronic hoof and digit will require more aggressive corrections to correct the bony column alignment (increase palmar angles) and is applied expeditiously to 1) abate digit soft tissue inflammation and 2) slow or arrest progressive bony changes. Timing is crucial to stop the digit pathological compromise before it becomes irreversible.
Digit Function: n : any of the divisions (as a finger or toe) in which the limbs of amphibians and all higher vertebrates including humans terminate, which are typically five in number but may be reduced (as in the horse), and which typically have a series of phalanges bearing a nail, claw, or hoof at the tip Merriam-Webster's Medical Dictionary, © 2007 Merriam-Webster, Inc.
When the trimmer/farrier is working with the pathological digit, minimally an initial complete assessment should be performed as a team between the trimmer/farrier and an experienced equine veterinarian.
A vet can offer invaluable insight to aid the farrier in achieving bony column alignment when corrective hoof trimming alone, does not offer enough assist to achieve the desired results. While a balanced trim is imperative to the success of the program, many factors and dimensions of the hoof and limb come into play that can directly affect bony column alignment, palmar angles and general hoof health.
Lowered palmar angles and compromised digital cushions often go hand in hand with resultant soft and hard tissue pathology.
Lamellar compromise, evident in a hoof exhibiting a lamellar wedge (dished toe) or medio/lateral listing need veterinary assistance and arrest of the source of the laminitic event(s) before hoof integrity can be restored and bony column alignment accomplished.
Trimmer/Farrier skills are important, with the ability to accomplish the corrective hoof trimming and therapeutic farrier prescription with accuracy and consistency. Methodical progress towards the balanced trim with attention to detail and external assists applied to meet the farrier prescription will produce an improved bony column alignment and set up the hoof to respond favorably.
When working with pathological hooves, a complete assessment should be performed by an experienced equine veterinarian who:
From all the above information a diagnostic interpretation is presented.
To complete the veterinarian soundness assessment, the veterinarian must be proficient to develop a treatment plan including a farrier prescription for corrective hoof trimming and external assists where necessary. This comes from a clear understanding of bony column alignment and experience in physical application of balanced trim protocol and shod application to achieve such.
It is paramount that the farrier and the veterinarian come together on the treatment plan and agree on the farrier prescription, which is then presented to the owner/client as a team with all parties agreeable and understanding the whole treatment plan.
The treatment is not just dealing with corrective trimming. While a balanced trim is the end point, addressing bony column alignment, palmar angles, breakover, bar and heel address etc. the larger picture looks at arresting, slowing or reversing pathology, rebuilding soft tissue, promoting circulation and cellular repair, addressing underlying medical conditions and effectively treating the whole horse.
A well-rounded plan should involve veterinary medicine to identify and address the SOURCE of the problem, and teamwork (veterinarian, farrier and owner) to address all assists available to care for the lame horse. This may include:
If the plan is to succeed long term, all factors must be considered and employed working as a team.
Consistent corrective hoof trimming cycles at 4 week intervals are important during the rehabilitation program. Routine maintenance is equally important to maintain the balanced trim. The hoof is dynamic and consistent and accurate farriery is required to maintain bony column alignment, optimal palmar angles and overall hoof health.
Corrections will vary from hoof to hoof, but the bio-mechanics and applied mapping techniques of the hoof can be routinely applied to aid in optimizing the best balanced trim for that hoof on that day moving towards bony column alignment and positive palmar angles.
Please contact us for the opportunity to learn how to accurately hoof map the foot and distinguish between a flare and a lamellar wedge. We will help you visualize and assess bony column alignment (pastern axis), understand low palmar angles and other hoof capsule maladies such as the migrated hoof capsule. We will look at the various hoof pathologies, including understanding podiatry "balance" radiograph images, Metron markups, and recommendations to accomplish digit balance improvements with the trim. We will explore balanced trim protocol as best one can and suggest corrective hoof trimming techniques to achieve bony column alignment.