Will maxillomandibular advancement always lead to a longer face?

I have a Class I relationship after braces, but I will need MMA surgery to open up my airway (movements will be about 10mm each). Since the jaw comes forward and down when it is advanced, is there any way to prevent the face elongating during this surgery? I don't like my profile, but I like my face from the front and if I jut my jaw forward I look like I have acromegaly. I don't have a gummy smile, so I can't do anterior impaction as far as I know.