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Background <p>Orthognathic surgery may alter temporomandibular joint (TMJ) loading and masticatory muscle function, but these changes are difficult to quantify with routine clinical assessment.</p> Objective <p>To assess the feasibility of a patient-specific musculoskeletal modeling workflow for quantifying biomechanical change after orthognathic surgery.</p> Methods <p>A 23-year-old woman treated with Le Fort I osteotomy and bilateral sagittal split osteotomy with mandibular setback was studied. Pre- and postoperative computed tomography and jaw motion recordings drove subject-specific inverse dynamics simulations of chewing and mouth opening/closing. Outputs were mandibular kinematics, muscle forces and bilateral TMJ reaction forces; postoperative data were obtained at six months.</p> Results <p>During chewing, right condylar excursions increased and left excursions decreased, and interincisal horizontal excursion increased from 7 to 10&#xa0;mm. During opening/closing, condylar superior-inferior excursion decreased bilaterally. Muscle forces rose broadly during chewing, particularly in the medial pterygoid, inferior lateral pterygoid and suprahyoid groups. Resultant TMJ reaction forces increased in all four comparisons (chewing right 10.7 to 68.5&#xa0;N, left 9.4 to 29.9&#xa0;N; opening/closing right 17.7 to 26.0&#xa0;N, left 10.3 to 11.4&#xa0;N).</p> Conclusions <p>The workflow quantified postoperative TMJ loading, muscle force and kinematic change in this single case. Larger longitudinal studies are needed before clinical application.</p>

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Biomechanical Evaluation of Orthognathic Surgery Using Patient-specific Musculoskeletal Modeling: A Pilot Case Study

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Fatih Alibeyoğlu,
  • Can Özcan,
  • İrfan Kaymaz,
  • İlhan Metin Dagsuyu

摘要

Background

Orthognathic surgery may alter temporomandibular joint (TMJ) loading and masticatory muscle function, but these changes are difficult to quantify with routine clinical assessment.

Objective

To assess the feasibility of a patient-specific musculoskeletal modeling workflow for quantifying biomechanical change after orthognathic surgery.

Methods

A 23-year-old woman treated with Le Fort I osteotomy and bilateral sagittal split osteotomy with mandibular setback was studied. Pre- and postoperative computed tomography and jaw motion recordings drove subject-specific inverse dynamics simulations of chewing and mouth opening/closing. Outputs were mandibular kinematics, muscle forces and bilateral TMJ reaction forces; postoperative data were obtained at six months.

Results

During chewing, right condylar excursions increased and left excursions decreased, and interincisal horizontal excursion increased from 7 to 10 mm. During opening/closing, condylar superior-inferior excursion decreased bilaterally. Muscle forces rose broadly during chewing, particularly in the medial pterygoid, inferior lateral pterygoid and suprahyoid groups. Resultant TMJ reaction forces increased in all four comparisons (chewing right 10.7 to 68.5 N, left 9.4 to 29.9 N; opening/closing right 17.7 to 26.0 N, left 10.3 to 11.4 N).

Conclusions

The workflow quantified postoperative TMJ loading, muscle force and kinematic change in this single case. Larger longitudinal studies are needed before clinical application.