Why are some tummy tuck scars straight across the tummy while others are a U-shape?

There are any number of issues that can affect scar shape:  a patient's anatomy, surgeon preference, patient preference, and the technique used to name a few. My best,Dr. Sheila Nazarian@drsheilanazarian on Instagram

The shape and position of the scars depend on the patient's individual anatomy, patient's desire with regard to placement and type of bathing suit and underwear, as well as surgeon experience and preference.If a member of my family underwent a tummy tuck, it would be
performed by an experienced plastic surgeon who is board certified by the
American Board of Plastic Surgery and ideally a member of the American Society
for Aesthetic Plastic Surgery. If you are serious about undergoing this
procedure, you should have a thorough consultation with a plastic surgeon
having those credentials, who will fully explain what is entailed in the procedures,
including both the positives and potential problems. You should be complimented
on the fact that you are seeking valid information before jumping into any
procedure.
Robert Singer, MD FACS
La Jolla, California