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Evaluation Using Hoof Wall Strain Gauges of a Therapeutic Shoe and a Hoof Cast with a Heel Wedge as Potential Supportive Therapy for Horses with Laminitis

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Objective

To evaluate using strain gauges, a hoof cast with heel wedge, and a therapeutic shoe with unsupported toe for their effectiveness in redistribution of load from the dorsal hoof wall. Study Design

In vitro biomechanical study. Sample Population

Twenty forelimb specimens. Methods

Rosette strain gauges were placed on the dorsal and lateral hoof wall of 20 normal shaped hooves. Limbs were loaded vertically using a tensile testing machine with a 1 Hz sinusoidally cycling load up to 3000 N during 15 seconds. Mean values of principal strain and direction at 2500 N load were calculated for 3 experimental conditions (unshod, therapeutic shoe with unsupported toe, and hoof cast with heel elevation) and tested by ANOVA (P<.05). Results

Vertical limb loading in an unshod hoof leads to a biaxial compression of the dorsal wall with high longitudinal compression (2=−1515 m/m). Principal strain at the dorsal wall (2) was decreased by 23% with the therapeutic shoe and by 59% with the hoof cast. On the lateral hoof wall principal strain was unchanged with the shoe, but increased by 34% with the cast. Conclusions

Strain measurements indicate unloading of the dorsal hoof wall by both methods with the cast being more effective than the shoe. Clinical Relevance

The hoof cast with wedge offers substantial unloading of the dorsal wall, but increases load on the quarter. Therefore a hoof cast would likely be most helpful in acute laminitis when palmar structures can still bear load. The therapeutic shoe offers rehabilitation and regrowth of the dorsal wall without increased load on the quarter wall.
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Keywords: hoof cast; hoof wall; horse; laminitis; laminitis therapy; strain gauges; therapeutic shoe

Document Type: Research Article

Affiliations: From the Department for Small Animals and Horses and the Department for Natural Sciences, University of Veterinary Medicine Vienna, Vienna, Austria.

Publication date: November 1, 2005

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