injury to coronary band

[Mariaricardo]

My 10 yr old mare cut her left rear lateral heel bulb on a piece of metal 4-13-05. The wound was deep, but didn't involve anything to cause lameness. Was not stitched. It did go into the coronary band on the outside quarter to the rear of the widest part of the hoof. Has filled in and almost completely scabbed over. No proud flesh. Had her rear shoes removed 4-28. Today I noticed that there is a line in the hoof below the injury going down to the ground. The first sign of a crack? I would like to know if there is anything I can do to prevent a quarter crack? Until my farrier comes, should I rasp part of the hoof off at ground level below it? Or is it likely that a crack will develop anyway if the coronary band is cut? What is the usual course these types of injuries follow? What are the pitfalls? What kind of shoe is best? Why? Please enlighten me with your experiences.
Thank you,
Maria

[calshoer]

Because the wound involved the coronary band, there may develop a permanent flaw in the hoofwall below it. :(
But if the flaw is shallow enough (not involving the entire thickness of hoofwall) it will not be a structural problem.
If on the other hand the defect DOES involve the enture thickness of wall., it could be a problem .
Rasping a section of the ground surface of the wall directly below the crack may indeed help to relieve stress on it and prevent it from coming apart if it is weak. So I would say sure go ahead and do that. It won't hurt. Patty