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[The morphological study on masseter muscle following mandibular angle osteotomy].

Ming Zhu¹, Gang Chai, Yan Zhang

¹Department of Plastic and Constructive, Ninth Hospital affiliated to Medical School of Shanghai Jiaotong University, Shanghai 200011, China.

Zhonghua Zheng Xing Wai Ke Za Zhi = Zhonghua Zhengxing Waike Zazhi = Chinese Journal of Plastic Surgery

|December 24, 2010

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Mandibular angle osteotomy causes spontaneous masseter muscle atrophy, particularly near the angle. This muscle volume reduction should be a key consideration in surgical planning for facial contouring procedures.

Area of Science:

Plastic Surgery
Oral and Maxillofacial Surgery
Biomedical Imaging

Background:

Mandibular angle osteotomy is a surgical procedure to reshape the jawline.
Understanding the impact on adjacent muscles like the masseter is crucial for aesthetic outcomes and functional recovery.

Purpose of the Study:

To quantitatively assess the morphological changes in the masseter muscle following mandibular angle osteotomy.
To evaluate the extent and timeline of masseter muscle volume and cross-sectional area reduction post-surgery.

Main Methods:

120 patients undergoing mandibular angle osteotomy were examined using computerized tomography (CT) scans.
Pre- and post-operative CT images were analyzed at 3, 6, and 12 months to measure masseter muscle thickness, cross-sectional area, and volume using 3D reconstruction.

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Measurements were taken across three specific slice planes parallel to the Frankfurt horizontal plane.

Main Results:

A significant reduction in masseter muscle volume and cross-sectional area was observed post-osteotomy.
Masseter volume decreased to approximately 82%, 77%, and 80% at 3, 6, and 12 months, respectively.
Significant reductions in cross-sectional area were noted across all measured planes, with the most pronounced changes at plane C.

Conclusions:

Masseter muscle atrophy occurs spontaneously after mandibular angle osteotomy, particularly in the mandibular angle region.
These morphological changes, including muscle volume and area reduction, are significant and should be factored into surgical design.
The findings highlight the importance of considering post-operative muscle changes for predictable aesthetic results.