Re: How exactly do you measure degrees of rotation?

Posted by malinda on March 22, 2003 at 11:48:46:

In Reply to: Re: How exactly do you measure degrees of rotation? posted by Derin Foor on March 21, 2003 at 21:06:55:

: : As per the radiographs of a horse I'm working on:
: : The vet drew a line corrosponding to the front of the coffin bone and a line corrosponding to the front of the hoof wall (after dish removed), and measured the difference between the angles.

: : Just wondering because I think I had read somewhere that you're supposed to measure the coffin bone versus P2 and P1. Would this come up with a different number than measuring the other way?

: Malinda,

: Measuring rotation especially the way you describe is very inaccurate.......you need to measure the following:

: 1. HL zone..... this is the horn lamellar zone using two measurements taken from the 'flat'dorsal aspect of P3 to the hoofwall.....the closer these two numbers are to each other, the better, however when either of them gets much over 20 mm you will likely have major congestion in the laminae.....trimming prior to x-rays will distort these numbers

: 2. Palmar angle.......this is the angle created by taking measurements between the solar surface of the foot and the palmar surface of P3.....normal palmar angle is 3-5 degrees, so a good idea of rotation is the measured angle minus 3-5 degrees.... a positive palmar angle indicates rotation to some degree.......BTW a negative palmar angle indicates caudal rotation

: 3. also measure the EP/CB difference...... this takes into account the difference between the extensor process and the coronary band........@ 14-17mm is normal

: 4. perhaps the most critical measurement is the sole depth..... you need a minimum of 15mm for normal circulation...... anything less and the circulation is compromised or eliminated to the palmar surface of the foot

: hope this helps

: Derin

: P.S.......plan to attend the Laminitis Symposium next year if you are working on foundered horses..... best resource available for this type of shoeing

Thanks much!

I have copies of the x-rays and will measure them.

Now, when you say Xmm is average, are you talking about an average size horse? The horse in question is a 12h pony.

*Someday* I will get my butt to the Laminitis Symposium....

malinda

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Re: How exactly do you measure degrees of rotation? Derin Foor 21:58:59 03/23/03 (0)

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: : : As per the radiographs of a horse I'm working on: : : : The vet drew a line corrosponding to the front of the coffin bone and a line corrosponding to the front of the hoof wall (after dish removed), and measured the difference between the angles. : : : Just wondering because I think I had read somewhere that you're supposed to measure the coffin bone versus P2 and P1. Would this come up with a different number than measuring the other way? : : Malinda, : : Measuring rotation especially the way you describe is very inaccurate.......you need to measure the following: : : 1. HL zone..... this is the horn lamellar zone using two measurements taken from the 'flat'dorsal aspect of P3 to the hoofwall.....the closer these two numbers are to each other, the better, however when either of them gets much over 20 mm you will likely have major congestion in the laminae.....trimming prior to x-rays will distort these numbers : : 2. Palmar angle.......this is the angle created by taking measurements between the solar surface of the foot and the palmar surface of P3.....normal palmar angle is 3-5 degrees, so a good idea of rotation is the measured angle minus 3-5 degrees.... a positive palmar angle indicates rotation to some degree.......BTW a negative palmar angle indicates caudal rotation : : 3. also measure the EP/CB difference...... this takes into account the difference between the extensor process and the coronary band........@ 14-17mm is normal : : 4. perhaps the most critical measurement is the sole depth..... you need a minimum of 15mm for normal circulation...... anything less and the circulation is compromised or eliminated to the palmar surface of the foot : : hope this helps : : Derin : : P.S.......plan to attend the Laminitis Symposium next year if you are working on foundered horses..... best resource available for this type of shoeing : Thanks much! : I have copies of the x-rays and will measure them. : Now, when you say Xmm is average, are you talking about an average size horse? The horse in question is a 12h pony. : *Someday* I will get my butt to the Laminitis Symposium.... : malinda

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