The use of implants to make woman's buttocks larger appears to have gone awfully wrong for one woman whose predicament is revealed in a 20-second clip posted online.

An implant looks to have popped out of the woman's buttock, leaving a strange disc shape protruding.

The clip shows the unidentified woman slowly manipulating the implant back into place.

"This is my implant flipping backwards," she said.

"I don't think an implant's supposed to do that. It shouldn't be able to flip."

No details are known about the footage, but British consultant plastic surgeon Adrian Richards told the Daily Mail he believed the clip was authentic.

The problem happened when the implant was not secured firmly enough in a pocket a surgeon created either between the buttock and the pelvic bone or on top of the gluteus maximus, he said.

"This lady's implant is flat on the bottom and coned on the top, but this one has flipped over."

It would not be painful, but would likely need to be removed, or the pocket closed up to stop it shifting around.

- © Fairfax NZ News