The two views are the same, one shown un-marked up for clarity.
The tops of the collateral grooves are indicated with red marks. The depth of the collateral groove is determined by the height (or length) of the bar, which is not visible on xray. The collateral groove on the medial side is very deep, much more so than the lateral side. It appears to be projecting up into the bottom of the coffin bone which is probably very painful, since this area is full of sensitive tissue. The bar and collateral groove has pushed up the inside side of the foot, displacing the balance of the foot. The inside wall is much higher and longer than the outside. The hairline and top of the wall/coronary band are indicated with the red arrows. The two points should be straight across, parallel with the ground. Another detrimental effect of this deep collateral groove is the displacement of the P3/P2 joint. The joint space is narrower on the outside, wider on the inside. This can lead to ossifications and arthritic problems such as sidebone and ringbone.
Lowering the bar on the inside to the same length as the outside will correct these balance problems.
This is a 9 month old filly whose right front foot is clubby. It has been shod on the recommendation of several vets and farriers who believe the tendon is ‘tight’ (despite no evidence to indicate this), and shoeing it and gradually lowering the heel is expected to correct this situation.
The toe wall has begun to bulge out, possibly as a result of the shoe ‘holding’ the bottom of the foot while the rest of the foot tries to grow outward.
This is a 5 yo Morgan mare. The trim was started at age 3, and the second row of pictures shows the progress after about one year.
With frequent trimming, the heel has been kept low and the coffin bone placed in a near-ground parallel orientation. This has enabled the dish in the toe wall to grow out, and the hoof rings to become somewhat more concentric (more equal distance between them at the heel and at the toe. When the heel grows faster than the toe, the rings are wider at the heel. A healthy foot’s growth should be even all around with equidistant rings). However by the age of three there was already considerable joint adaptation in the coffin joint, creating the broken forward hoof-pastern axis.
The mare recently competed in her debut dressage show, winning her Intro test amongst a class of six, as well as getting an award for second highest score of the day. She has a bright future ahead of her as an all-around fun horse.