Teardrop implants occasionally rotate, what is the risk of putting new teardrop implants in?

It is a common misconception that anatomical implants look natural and round implants do not.  It's the choice of the implant size and projection that determine if the look is natural.  Of course all of the implants should be under the muscle to look more natural.  Anatomical implants look natural in the upright position.  But laying down they maintain the same shape which is not what a natural breast does.  A natural breast flattens when the woman is laying down so in my option a round breast implant such as the MP+ style of implants look more natural.   There is a 5% chance that anatomical implants will rotate.  Why deal with an additional 5% complication rate which requires reoperation.  If you are set on only having an anatomical implant, the pocket must be closed so the implant has less chance of rotation.  Also implants with a more aggressive texturing such as the 410 and Sientra brand tends to incorporate better and rotate less. 

Tear drop implants will keep on rotating.  Thus makes no sense to replace them since issues will remain.  Your plastic surgeons guided you correctly.  Round implants are excellent choice and do not create the problem of rotation.