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Related Experiment Video

Updated: May 7, 2025

Measurement of Basal and Forskolin-stimulated Lipolysis in Inguinal Adipose Fat Pads
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The Linear Retrograde Infiltration (LiRi) Technique for Buttock Fat Infiltration: A Cohort Evolution.

Héctor Cesar Durán Vega1, David Sieber2, Sofia Magallanes1

  • 1Plastic surgeon in private practice, Merida, Yucatán, Mexico.

Aesthetic Surgery Journal
|January 7, 2025
PubMed
Summary

The LiRi technique for buttock fat grafting is safe and effective, showing minimal complications like fat cysts and asymmetries. This method reduces the risk of serious issues such as fat embolism in gluteal augmentation procedures.

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Area of Science:

  • Plastic Surgery
  • Aesthetic Medicine
  • Regenerative Medicine

Background:

  • Autologous fat grafting for buttock augmentation is popular.
  • A significant risk is fat infiltration into the venous system, potentially causing fatal macroscopic fatty embolism (MAFE).

Purpose of the Study:

  • To evaluate the safety and efficacy of the Linear Retrograde infiltration (LiRi) technique for autologous fat grafting in the buttocks.
  • To assess the technique's outcomes over a six-month follow-up period.

Main Methods:

  • The LiRi procedure was performed on 114 patients.
  • Strict ultrasound guidance was employed with specific cannulas (4-5 mm basket or 4 crosshead holes).
  • Cannula placement in the deep subcutaneous space, avoiding the deep gluteal fascia, was confirmed via ultrasound before retrograde fat infiltration.

Main Results:

  • A low minor complication rate of 7% was observed, including fat cysts (7%), asymmetries (5%), and contour irregularities (2%).
  • One case of fat necrosis occurred; no infections or fat embolisms were reported.
  • No significant correlation was found between complications and patient BMI or total infiltration volume.

Conclusions:

  • The LiRi technique appears safe and effective for gluteal augmentation.
  • The method demonstrates consistent fat integration and minimal complications.
  • Further long-term research is recommended to validate these findings.