Because of their rough surface, tissue around textured implants grows into the interstices and micro-irregularities, gripping the implant surfaces and immobilizing them exactly where they’re placed during breast augmentation surgery.  Implant placement is important to breast appearance.  The center of a round implant must remain behind the center of the breast.  Shaped implants must remain in anatomic orientation with the tapered edge at the top of your breast and the fullness at the bottom.  Textured surfaces increase friction between the implant and its surroundings so the implant is more likely to remain in position, and less likely to rotate.  Dr. Laverson believes textured surface breast implants are less likely than smooth implants to migrate to your sides (and thus more likely to remain toward your center) when placed beneath the pectoralis (chest) muscle.  “Sub-pectoral” (beneath the pectoralis major muscle) breast implant placement means the implant is wedged between the pectoralis muscle covering its front surface and the implant base rests upon your curved ribs.  Contraction of the muscle during use of the arms applies force to the front of the implant and on its inner aspect, tending to push it out toward the side and down.  The capsule your body forms around a textured implant grows into the rough implant surface and like snow tires with deeper treads, the implant resists downward and outward displacement by dynamic muscular force.  Smooth surface breast implants slide more easily and with their lower coefficient of friction may be more prone to migration when placed beneath the pectoralis major muscle.