Hoof Deviation Terms

Posted on September 6, 2019 by Jerrilee.
Categories: handicap, health, history, hoofcare, therapy.

 

coffin bone dropping into sole

coffin bone dropping into sole

The above x-rays indicate the┬áhorse’s struggle for soundness when the coffin bone is affected.
Many readers have asked for more information regarding the terms used for hoof deviations.
The following should help:
Rotation of coffin bone: the coffin bone (P3) of the horse has dropped downward toward the interior bottom (sole) of the hoof. This means it has separated from the flesh (laminae) that hold it to the toe wall. In extreme cases the sharp point of the bone can fall far enough to cut through the sole of the hoof. The bone is still connected to the interior laminae on the sides, or quarters, of the hoof. Most cases can be fixed through correct trimming and hoof boots.
Sinking of the coffin bone: the coffin bone is completely detached from all the laminae of the hoof wall. The coffin bone rests on the interior sole of the hoof. Correct trimming and boots ease this problem but I have no documentation of a full correction yet.
White Line Separation: the flesh (laminae) are in process of separating from the coffin bone. Again, fixed through correct trimming.
Flaring: in most cases,the laminae have finally separated from the coffin bone resulting in rotation, or dropping, of the toe portion of the coffin bone. Oftentimes flaring and white line are used synonymously though there is a difference.
Mechanical Founder/Road Founderof the hoof: This is the term used for sinker & rotation of coffin bone which came about due to hard ground,shoeing,or the daily wear of a long toe that eventually separates the wall from the coffin bone.
Laminitis Founder:the laminae (flesh holding the coffin bone to the hoof wall) become inflamed and dropped their attachment to the coffin bone. The source of the inflammation must be determined to stop the founder in this case. Typically the cause is the diet and the shoeing of the horse; other causes include recent trauma,squalor conditions,abusive handling.
To understand in depth the care and trim required for Founder read Marjorie Smith’s full explanation.

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