Objective computerized versus subjective analysis of facial synkinesis

Area of Science:

• Neurology
• Biomedical Engineering
• Ophthalmology

Background:

• Facial synkinesis is a common complication following facial nerve injury.
• Current assessment methods for facial synkinesis rely on subjective evaluations.
• Objective, quantitative measures may offer improved sensitivity and reliability.

Purpose of the Study:

• To compare the sensitivity of objective computerized facial motion analysis with subjective assessment for detecting facial synkinesis.
• To evaluate the test-retest reliability of both objective and subjective approaches.
• To identify early indicators of synkinesis following facial nerve injury.

Main Methods:

• A prospective, nonrandomized, blinded study was conducted.
• Facial motion during smile and eyelid closure was measured using computerized motion analysis.
• Objective measurements were compared with independent blinded subjective evaluations by two observers.

Main Results:

• Objective analysis detected facial synkinesis more frequently than subjective analysis for eyelid closure.
• No significant difference in sensitivity was observed for the closed-lip smile.
• Excellent test-retest reliability was found for objective measures; subjective evaluations showed close agreement.

Conclusions:

• Objective computerized analysis is a reliable and more sensitive method for detecting facial synkinesis, particularly for eyelid closure.
• The early onset of synkinesis in some patients suggests a role for central nervous system reorganization in facial nerve regeneration.