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Objective <p>To evaluate the outcomes of a novel mandibular sigmoid osteotomy (MSO). A technique combining simultaneous ankylosis release with distraction osteogenesis (DO) in patients of temporomandibular joint ankylosis (TMJA) and associated mandibular deformities.</p> Methods <p>This retrospective study analyzed 15 patients (aged 5–30&#xa0;years) with unilateral or bilateral TMJA and mandibular asymmetry treated with a S-type osteotomy to optimize bone segment mobilization and distractor placement. Pre- and postoperative data, including clinical records and CT-based 3D analyses, were used to measure changes in mandibular ramus height, body length, and curvilinear length. All patients achieved satisfactory mouth opening (≥ 35&#xa0;mm). Statistically significant improvements were observed in mandibular ramus height (mean increase 3.22&#xa0;mm), body length (4.91&#xa0;mm), and curvilinear length (6.07&#xa0;mm) (p &lt; 0.001). Stable osteogenesis and successful multiplanar correction without significant complications were achieved.</p> Conclusion <p>The MSO technique combined with distraction enables simultaneous correction of mandibular deformities while restoring joint function, offering significant advantages of predictable functional and aesthetic outcomes. However, the study is limited by the small sample size, underscoring the need for larger studies to validate efficacy and better assess complications.</p>

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Functional and Esthetic Rehabilitation in TMJ Ankylosis with MSO (Mandibular Sigmoid Osteotomy): A Retrospective Assessment and Design Rationale

  • 期刊论文

  • 发表日期：

    2026年1月22日

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  • Sailesh Kumar Mukul,
  • B. Vidya,
  • Sibgutulah Rashid,
  • Weihsin Hu,
  • Abhishek Singh,
  • Shweta Pandey

摘要

Objective

To evaluate the outcomes of a novel mandibular sigmoid osteotomy (MSO). A technique combining simultaneous ankylosis release with distraction osteogenesis (DO) in patients of temporomandibular joint ankylosis (TMJA) and associated mandibular deformities.

Methods

This retrospective study analyzed 15 patients (aged 5–30 years) with unilateral or bilateral TMJA and mandibular asymmetry treated with a S-type osteotomy to optimize bone segment mobilization and distractor placement. Pre- and postoperative data, including clinical records and CT-based 3D analyses, were used to measure changes in mandibular ramus height, body length, and curvilinear length. All patients achieved satisfactory mouth opening (≥ 35 mm). Statistically significant improvements were observed in mandibular ramus height (mean increase 3.22 mm), body length (4.91 mm), and curvilinear length (6.07 mm) (p < 0.001). Stable osteogenesis and successful multiplanar correction without significant complications were achieved.

Conclusion

The MSO technique combined with distraction enables simultaneous correction of mandibular deformities while restoring joint function, offering significant advantages of predictable functional and aesthetic outcomes. However, the study is limited by the small sample size, underscoring the need for larger studies to validate efficacy and better assess complications.