What is the most likely cause of implant rupture at 6 months?

Dear Gentle346707,
implants have a strong capsule and in most cases, it needs a big trauma in order for them to rupture. It is unlikely that they will rupture without any trauma.
Daniel Barrett, MDCertified, American Board of Plastic SurgeryMember, American Society of Plastic SurgeryMember, American Society of Aesthetic Plastic Surgery

The vast majority of cases of early implant shell breach is a sharp injury to the implant shell at the time of implantation, and almost always it occurs when closing the incision with a suture needle traversing the shell without the surgeon knowing. In the 'old days', implant manufacturers bothered to analyze rupture implants under the electron microscope to determine whether it was a true failure or sharp injury. Today, with the no questions asked warrantees, I do not believe they are bothering to do so any longer.

That is odd. You should ask your surgeon to call the manufacturer. They should at least give you your new implants for free. I have found that implant manufacturers often do this to keep their doctors and patients happy

I'm sorry to hear of the issue you had with your implant. Implants can rupture for many reasons so it is difficult to say what may have occurred with yours. It could be anything from trauma, faulty implant, damage to the implant, age, capsular contracture, or something else.

You can break anything, including implants. However, rupture at 6 months is usually from trauma from injury or accident, or the surgeon's scalpel or needle. The company can examine your implant, if sent, and see what the tear looks like.