I wouldn't advise this for several reasons:
(1) As several others have pointed out, the personal statement is the place where you want to reveal something *personal* about yourself. You can definitely relate the formative experiences that have steered you towards your interest in pediatrics or geriatrics or obstetrics or whatever, but the emphasis needs to be on you.
(2) Are you only applying to schools that excel in the specialty you're interested in? Because if you are applying to others, they might not be as interested in you knowing that you probably won't like it there. The initial AMCAS personal statement should be generic enough to work for all the schools. Going into the specifics of each program is better done in the secondaries.
(3) People learn and people change. A big part of med school is going through the different rotations and figuring out where you fit best. Doctors are very skeptical of students who come in without knowing much about the specialty beyond the certainty that they want to be in it. Don't burn any bridges. Say what interests you, but be open and willing to learn about other things.
Hope this helps! Good luck!