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Diffusion and perfusion: the keys to fat grafting.

Roger K Khouri1, Raoul-Emil R Khouri1, Jorge R Lujan-Hernandez1

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Fat grafting survival depends on oxygen delivery. Thin fat injections and preoperative expansion improve oxygen diffusion, enhancing fat graft retention and survival in plastic surgery.

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Area of Science:

  • Biomedical Engineering
  • Plastic Surgery
  • Tissue Engineering

Background:

  • Fat grafting is a common plastic surgery procedure with unpredictable long-term graft retention.
  • Graft survival is contingent on oxygen supply via diffusion until new blood vessels form (neovascularization).
  • Oxygen delivery is hypothesized as the critical factor influencing fat graft retention.

Purpose of the Study:

  • To investigate factors influencing oxygen delivery to fat grafts.
  • To develop predictive models for fat graft retention based on oxygen transport dynamics.
  • To provide a scientific basis for optimizing fat grafting techniques.

Main Methods:

  • Literature review of peer-reviewed studies on fat grafting and oxygen delivery.
  • Development of three distinct mathematical models: Microribbon Model, Fluid Accommodation Model, and External Volume Expansion Effect Model.
  • Analysis of variables affecting oxygen delivery within the fat graft and its surrounding microenvironment.

Main Results:

  • The Microribbon Model indicates that thin fat injections maximize oxygen transport, with injections exceeding 0.16 cm radius predicted to cause central necrosis.
  • The Fluid Accommodation Model predicts reduced oxygen delivery when interstitial fluid pressure exceeds 9 mm Hg, impairing capillary perfusion.
  • The External Volume Expansion Effect Model demonstrates that preoperative external volume expansion can enhance vascularity, allowing for greater fat graft volumes.

Conclusions:

  • Initial survival of fat grafts is fundamentally limited by oxygen diffusion.
  • Preoperative expansion strategies can augment oxygen diffusion capacity, leading to improved graft retention.
  • The developed models offer a scientific framework for evaluating and advancing current fat grafting theories and practices.