Abstract
Background
Reliable quantitative data are required to address the unpredictability of facial autologous fat grafting (AFG). Facial evaluation by 3D scanning technology is getting popular. However, this process lacks unified standards and the reliability assessments. This study aimed to summarize a set of standards to improve the 3D quantified reliability of AFG outcomes.
Methods
A systematic review was used to collect the differences in and limitations of 3D assessments and analyze the effect of the quantification process on the AFG outcomes. Healthy subjects undergoing only one facial structural AFG and 3D assessments were included. The revealed specific issues guided the subsequent narrative review that involves 3D measurement and fat volume retention rate (FVRR) analysis. Criteria were formulated based on the narrative review.
Results
The systematic review revealed the quantitative process to be operator-dependent. The intra-group FVRR in the postoperative 11+ month group varied significantly (P=.03). The review identified a set of 3D measurement standards, including two optimal software products, two necessary steps for preprocessing, and four testing criteria. We proposed a new calculation formula and parameter and recommended a segmental area analysis for assessing the outcomes of full-face fat grafting.
Conclusions
As far as the 3D evaluation of AFG outcomes is concerned, this is the first study to comprehensively analyze the process and set quantitative criteria. These standards would not only guide future research more reliably, but also provide fresh insight into the review of the past research. 3D measurement standards also apply to all face-related studies requiring 3D registration.
Level of Evidence III
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WW contributed to study design and manuscript editing. CY contributed to database search and critical revision. HW contributed to data gathering. WG contributed to critical revision.
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Wang, W., Yao, C., Wang, H. et al. Three-dimensional Quantitative Standards for Assessing Outcomes of Facial Lipotransfer: A Review. Aesth Plast Surg 47, 1568–1577 (2023). https://doi.org/10.1007/s00266-023-03266-6
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DOI: https://doi.org/10.1007/s00266-023-03266-6