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Updated: Jun 10, 2026
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Method to Measure Tone of Axial and Proximal Muscle
Published on: December 14, 2011
Angular measurement for determining muscle tonus in facial paralysis
Adriana Tessitore1, Luis Alberto Magna, Jorge Rizzato Paschoal
1Ambulatório de Paralisia Facial Setor de Reabilitação Orofacial, Hospital de Clínicas, Faculdade de Ciências Médicas, Universidade Estadual de Campinas, Brazil. dritessi@hotmail.com
Pro-Fono : Revista De Atualizacao Cientifica
|July 20, 2010
Summary
Peripheral facial paralysis impacts emotional well-being. The Labial Commissure Angle offers an objective measurement for assessing facial muscle tonus changes after orofacial rehabilitation.
Area of Science:
- Medical rehabilitation
- Anthropometry
- Facial nerve disorders
Background:
- Peripheral facial paralysis leads to decreased facial movements, causing aesthetic and emotional distress.
- Orofacial rehabilitation aims to restore facial movement and mimicry.
- Quantifying therapeutic outcomes and muscle tonus objectively remains a challenge, with current methods often being subjective.
Purpose of the Study:
- To introduce the Labial Commissure Angle as a novel anthropometric marker.
- To assess the reliability of this angle as an objective tool for evaluating changes in facial muscle tonus post-rehabilitation.
Main Methods:
- The study included 20 patients with peripheral facial paralysis (Level IV).
- Photographic documentation was used, taken 15 days to 1 year after paralysis onset.
- The Labial Commissure Angle was measured manually using a protractor on photographs, based on defined anthropometric facial points.
Main Results:
- The average Labial Commissure Angle decreased significantly from 101.70 before treatment to 93.80 after rehabilitation (SD = 4.3).
- Statistical analysis confirmed a significant difference (p < 0.001), indicating treatment efficacy.
Conclusions:
- The Labial Commissure Angle demonstrates potential as an objective measure for evaluating modifications in facial muscle tonus.
- This anthropometric marker can aid in quantifying the effectiveness of orofacial rehabilitation interventions.
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