title: Eye-hand laterality and right thoracic idiopathic scoliosis.
abstract: OBJECTIVE
  The adolescent idiopathic scoliosis (AIS) pathogenesis remains unknown. Certain studies have shown that there is a correlation between manual laterality and scoliotic deviation. A full study of manual laterality needs to be paired with one for visual dominance. With the aim of physiopathological research, we have evaluated the manual and visual laterality in AIS.
  
  
  METHODS
  A retrospective study from prospective data collection is used to evaluate the distribution of eye-hand laterality (homogeneous or crossed) of 65 right thoracic AIS (mean age 14.8 ± 1.8 years; mean Cobb angle: 32.8°) and a control group of 65 sex and age-matched (mean age 14.6 ± 1.8 years). The manual laterality was defined by the modified Edinburgh Handedness Inventory. The evaluation of the visual laterality is done using three tests (kaleidoscope test, hole-in-the-card test, distance-hole-in-the-card test).
  
  
  RESULTS
  The group of right thoracic AIS presents a significantly higher frequency of crossed eye-hand laterality (63 %) than the control group (63 vs. 29.2 %; p < 0.001). In the AIS group, the most frequent association, within crossed laterality is "right hand dominant-left eye dominant" (82.9 %). There is no relationship with the Cobb angle.
  
  
  CONCLUSIONS
  Those with right thoracic AIS show a higher occurrence of crossed eye-hand laterality. This could point physiopathological research of AIS towards functional abnormality of the optic chiasma through underuse of cross visual pathways, and in particular accessory optic pathways. It would be useful to explore this by carrying out research on AISs through neuroimaging and neurofunctional exploration.
authors.affiliation: Physical Medecine and Rehabilitation Département, Centre de Rééducation Pédiatrique Marc Sautelet, 10 rue du Petit Boulevard, BP 20127, 59653, Villeneuve d'Ascq Cedex, France, jean-francois.catanzariti@orange.fr.
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Catanzariti
authors.forename: Marc-Alexandre
authors.initials: MA
authors.lastname: Guyot
authors.forename: Olivier
authors.initials: O
authors.lastname: Agnani
authors.forename: Samantha
authors.initials: S
authors.lastname: Demaille
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Kolanowski
authors.forename: Cécile
authors.initials: C
authors.lastname: Donze
mesh_terms: D000293:Adolescent; D016022:Case-Control Studies; D002648:Child; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006225:Hand / Q000502:physiology*; D006801:Humans; D008297:Male; D009799:Ocular Physiological Phenomena; D012189:Retrospective Studies; D012600:Scoliosis / Q000503:physiopathology*; D013904:Thoracic Vertebrae / Q000503:physiopathology