To answer this question nothing better than recommending an article published in May 2019 in Issue 5 of Volume 7 of Plastic and Reconstructive Surgery – Global Open, a companion journal to the American Society of Plastic Surgeons’ flagship publication, Plastic and Reconstructive Surgery; it is an open access, rigorously peer-reviewed, international journal focusing on global plastic and reconstructive surgery.
PRS Global Open educates and supports plastic surgeons globally to provide the highest quality patient care and maintain professional and ethical standards through education, research, and advocacy.
The article highlights the challenge that had been finding a technique that not only achieved volume increase but also allowed the remodeling of the buttocks.
The research considered a cohort of 1681 patients who underwent PMMA gluteal augmentation between 2009 and 2018. This peer-reviewed study demonstrated that buttock augmentation with PMMA is one of the best options for this type of procedure. In addition, the findings suggest that buttock augmentation guidelines should include PMMA filling as an option because PMMA was shown to cause few side effects, as demonstrated by this sample of patients.
Below is the link to the article:
Gluteal Augmentation with Polymethyl Methacrylate: A 10-year Cohort Study
The article is also published in the US National Library of Medicine, one of the National Institutes of Health of the United States of America:
Gluteal Augmentation with Polymethyl Methacrylate: A 10-year Cohort Study