I Fell Down Some Stairs Backwards & Sideways, Could I Have Ruptured my Implant?

Have you noticed any change in shape or size of your implants.  Saline implants will deflated pretty quick and you would notice a change in size.  With silicone implants, it would be much harder to tell.  If you have any concerns, you should see your PS and get examined.  May even need an MRI if he cannot tell.

Breast implants are extremely durable devices relative to bursting. Even major trauma is unlikely to cause of implant to fail.

it is unlikely that your implants broke after you fell but anything is possible. If you are having pain and/or swelling in the breast make an appointment with your doctor or Plastic surgeon.

I wouldn't worry, implants are very durable.  Keep an eye on it to see if you notice your breasts changing in any way such as shape, softness, etc.  It might not be a bad idea to get a physical exam and check in with your PS just to rule out any other possible complications.  ac

unlikely will hurt your implant as your back/sides should have taken the brunt of the injury.  If you have saline implants, a rupture would be obvious.  If you have gel implants, if your breasts have not changed in characteristics, its probably fine.  See your surgeon if you wish to get an exam.