0-20%! I believe the zero, 20% though?
I have done, literally, thousands of chevron (or Austin's) with not a single AVN of the head.
My best guestamation of why surgeons may have problems is that the apex of the osteotomy is too far distal and the angle to large.
Anyone else out there with no real problem with this procedure?
Steve

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DrSArbes
Fellow American College of Foot & Ankle Surgeons
Board Certified Foot & Ankle Surgery, ABPS
Adjunct Professor OCPM
Green Bay, Wisconsin, USA