Rippling depends on a lot of factors, amongst which are:
1-Compliance of the implant material-
A saline filled implant is very compliant so it is more prone to rippling. A cohesive silicon implant is less compliant so it has less tendency to ripple. A Gummy Bear implant is the stiffest, so it has almost no tendency to ripple.
2-Compliance of the soft tissue cover-
An implant on a very slender woman is more likely to show rippling than on a full figured woman because of the thicker subcutaneous tissue cover. An implant placed above the muscle has more of a chance to ripple than below the muscle on the same patient because the muscle has tone and masks rippling.
3- Implant Placement-
Implants placed below the muscle will show less rippling. Some implants are placed only partially under the muscle. The upper and medial pole is covered with muscle so it is less likely to ripple, but he inferior and lateral parts of the implant are not under muscle so these parts of the implant are more likely to show rippling.
