Abnormal Paravertebral Muscle Activity and Cervical Extensor Muscle Condition Affect Dynamic Spinal Balance during...

Area of Science:

• Biomechanical analysis
• Neuromuscular disorders
• Spinal imaging

Background:

• Dropped head syndrome (DHS) pathogenesis involves muscle fat infiltration and degeneration.
• Previous research noted gait-related spinal tilt deterioration in DHS patients.
• The link between dynamic spinal balance and imaging findings in DHS remains unclear.

Purpose of the Study:

• Investigate DHS walking posture using 3D gait analysis.
• Analyze the relationship between dynamic posture and conventional imaging findings.
• Explore the pathophysiology of cervical imbalance during gait in DHS.

Main Methods:

• 22 DHS patients underwent radiography and 3D gait motion analysis.
• Cervical and thoracic kinematic variables were assessed.
• Muscle activity (electromyography) and cervical deep extensor muscle (C-DEM) condition (MRI) were evaluated.

Main Results:

• Significant anterior cervical and thoracic spine tilt changes occurred during gait.
• These changes correlated inversely with thoracic paraspinal muscle activity.
• Cervical tilt changes linked to C-DEM fat-free status and fat infiltration rates.

Conclusions:

• Thoracic paraspinal muscles showed limited response to tilt deterioration, impacting postural endurance in DHS.
• C-DEM condition assessment may predict dynamic postural endurance.
• Findings are crucial for understanding DHS and managing patient daily activity difficulties.