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The Laminitis Site
Palmar/plantar angle calculator
PLEASE NOTE THIS CALCULATION IS NOT SCIENTIFICALLY VALIDATED AND IS AT BEST A ROUGH ESTIMATE THAT WE HAVE HAD REASONABLY GOOD RESULTS WITH ON REASONABLY HEALTHY FEET.
NO RESPONSIBILITY WHATSOEVER IS ACCEPTED FOR USE OF THIS CALCULATION
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We have been experimenting with a calculation to estimate the palmar/plantar angle based on simple triangle theorems using the collateral groove depths at the apex, the deepest part and the measurement of the distance (along the centre of the frog- as shown by the green line in the photo) between the points at which the collateral grooves (at the true frog apex and deepest part) are measured.  Early results on healthy feet measured against collateral grooves that can be seen on x-rays have been promising, but this is at best an estimating tool, not an accurate measure, and must be calibrated against x-rays for each individual horse.

For more information see Measuring Collateral Grooves




Picture
Example:
Enter all measurements in either cm or mm - it doesn't matter which are used but the same unit must be used for all 3 measurements.
Collateral groove depth at the apex: 9 mm
Collateral groove depth at the deepest part: 19 mm
Distance between apex and deepest part (measured along the centre of the frog): 70.5 mm
Press "Calculate"
The palmar angle is calculated as being approx. 8.07 degrees 
Picture
Picture

​​Palmar angle calculator
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Disclaimer: The information, suggestions and links (hereafter referred to as “information”) contained in this website are provided for information purposes only and should not be relied upon nor replace professional veterinary advice.  Information is non-veterinary, is based as far as possible on current research, does not constitute advice or diagnosis, and should be discussed in full with all relevant vets and hoofcare or other professionals.  No responsibility is taken for the accuracy or suitability of information contained in this website, and no liability accepted for damages of any kind arising from use, reference to or reliance on any information contained in this website.  If you suspect your horse has laminitis or is ill, please consult your vet. 
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