Subjective visual vertical and head position in patients with idiopathic scoliosis

Abstract

BACKGROUND: Idiopathic scoliosis (IS) is a structural spinal deformity that can affect the position of the head. One of the etiological hypotheses is that it can be caused by dysfunction of the vestibular system, which can cause abnormal perception of subjective visual vertical (SVV). OBJECTIVE: This study aimed to evaluate the differences in head position and its possible correlation with the perception of SVV in children with IS. METHODS: We examined 37 patients with IS and 37 healthy individuals. The position of the head was evaluated from digital photographs, where we compared the coronal head tilt and the coronal shoulder angle. Measurement of SVV perception was performed using the Bucket method. RESULTS: Coronal head tilt values were significantly different between the groups (median 2.3° [interquartile range 1.8–4.2] vs 1.3° [0.9–2.3], p = 0.001; patients vs. controls). There was a significant difference in SVV between the groups (2.33° [1.40–3.25] vs 0.50° [0.41–1.10], p < 0.001; patients vs controls). There was a correlation between the side of head tilt and the side of SVV in patients with IS (χ2 = 5.6, p = 0.02). CONCLUSIONS: Patients with IS had a greater head tilt in the coronal plane and impaired SVV perception.