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L-shaped Reduction Malarplasty: Its Geometric Consideration.

Yuanrong You1, Lai Gui2

  • 1Department of Comprehensive Plastic Surgery, Plastic Surgery Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.

Aesthetic Plastic Surgery
|April 20, 2026
PubMed
Summary
This summary is machine-generated.

Osteotomy line orientation in L-shaped reduction malarplasty significantly impacts zygomatic bone movement. Vertical lines minimize inward movement, while less oblique lines reduce downward displacement for precise surgical outcomes.

Keywords:
GeometricOsteotomyReduction malarplasty

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Area of Science:

  • Plastic Surgery
  • Craniofacial Surgery
  • Surgical Planning

Background:

  • L-shaped reduction malarplasty is a common procedure, particularly in Asian populations.
  • Previous studies have not explored the link between bone displacement and osteotomy line angles.
  • This research investigates the relationship between zygomatic complex bone movement and osteotomy line orientation.

Purpose of the Study:

  • To analyze how osteotomy line orientation influences zygomatic complex bone movement.
  • To develop a geometric model for optimizing surgical planning in malarplasty.
  • To provide evidence-based recommendations for surgical technique.

Main Methods:

  • Geometric models were created to analyze the relationship between bone movement and osteotomy angles.
  • A retrospective review of 20 zygomas from 10 patients undergoing L-shaped reduction malarplasty was conducted.
  • CT image measurements were compared to geometric calculations using paired t-tests and Bland-Altman analysis.

Main Results:

  • Developed equations demonstrating the impact of osteotomy orientation on zygomatic bone movement.
  • Oblique osteotomy lines were found to influence downward bone displacement.
  • Vertical osteotomy lines were shown to affect inward bone movement and the amount of bone resected.

Conclusions:

  • Osteotomy line orientation is a critical factor in zygomatic complex bone movement during malarplasty.
  • Minimizing downward movement requires a less slanted oblique osteotomy line.
  • Vertical anterior osteotomy lines are recommended for precise surgical execution and predictable results.