title: Preoperative balance control compensation in patients with a vestibular schwannoma: does tumor size matter?
abstract: OBJECTIVE
  The influence of tumor size on postural control of patients with vestibular schwannoma (VS) remains to be determined. This study aimed to compare the postural performances of VS patients, according to the size of the tumor, with healthy subjects.
  
  
  METHODS
  The six conditions (C1-C6) of the sensory organization test (SOT) were carried out in 87 patients, split into four groups according to the Koos classification (stage I-IV), and in 72 aged-matched controls to evaluate postural control. The vestibular reflectivity and compensation were estimated with videonystagmography.
  
  
  RESULTS
  Among patients, lower C5 and C6 scores were found in stage I and IV patients than in stage II and III patients, whereas vestibular compensation did not impact the tumor size influence on the postural control. The scores were significantly (p<0.001) lower for all the groups of patients than the controls in the vestibular-related SOT conditions (C5-C6).
  
  
  CONCLUSIONS
  Patients with an unilateral VS displayed altered postural performances compared to the control subjects and tumor size had a bell-like pattern effect on balance control.
  
  
  CONCLUSIONS
  The tumor size could be seen as a determining factor in the implementation of adaptive mechanisms that lead to the postural compensation and might be dissociated from vestibular compensation.
authors.affiliation: Service d'Oto-Rhino-Laryngologie et de Chirurgie Cervico-Faciale, Centre Hospitalier Universitaire de Nancy, 54000 Nancy, France; Université de Lorraine and Université Paris Descartes, Laboratoire APEMAC «Maladies chroniques, santé perçue et processus d'adaptation. Approches épidémiologiques et psychologiques» (EA 4360), 54500 Vandœuvre lès Nancy, France.
authors.forename: Laurence
authors.initials: L
authors.lastname: Ribeyre
authors.affiliation: Service d'Oto-Rhino-Laryngologie et de Chirurgie Cervico-Faciale, Centre Hospitalier Universitaire de Nancy, 54000 Nancy, France; Faculté de Médecine and UFR STAPS, Université de Lorraine, Laboratoire «Développement, Adaptation et Handicap» (EA 3450), 54500 Vandœuvre lès Nancy, France.
authors.forename: Julien
authors.initials: J
authors.lastname: Frère
authors.affiliation: Service d'Oto-Rhino-Laryngologie et de Chirurgie Cervico-Faciale, Centre Hospitalier Universitaire de Nancy, 54000 Nancy, France; Faculté de Médecine and UFR STAPS, Université de Lorraine, Laboratoire «Développement, Adaptation et Handicap» (EA 3450), 54500 Vandœuvre lès Nancy, France.
authors.forename: Gérome
authors.initials: G
authors.lastname: Gauchard
authors.affiliation: Faculté de Médecine and UFR STAPS, Université de Lorraine, Laboratoire «Développement, Adaptation et Handicap» (EA 3450), 54500 Vandœuvre lès Nancy, France; Sports Medicine Research Laboratory, Public Research Centre for Health, 1460 Luxembourg, Luxembourg.
authors.forename: Alexis
authors.initials: A
authors.lastname: Lion
authors.affiliation: Service d'Oto-Rhino-Laryngologie et de Chirurgie Cervico-Faciale, Centre Hospitalier Universitaire de Nancy, 54000 Nancy, France; Faculté de Médecine and UFR STAPS, Université de Lorraine, Laboratoire «Développement, Adaptation et Handicap» (EA 3450), 54500 Vandœuvre lès Nancy, France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Perrin
authors.affiliation: Université de Lorraine and Université Paris Descartes, Laboratoire APEMAC «Maladies chroniques, santé perçue et processus d'adaptation. Approches épidémiologiques et psychologiques» (EA 4360), 54500 Vandœuvre lès Nancy, France.
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Spitz
authors.affiliation: Service d'Oto-Rhino-Laryngologie et de Chirurgie Cervico-Faciale, Centre Hospitalier Universitaire de Nancy, 54000 Nancy, France; Faculté de Médecine and UFR STAPS, Université de Lorraine, Laboratoire «Développement, Adaptation et Handicap» (EA 3450), 54500 Vandœuvre lès Nancy, France. Electronic address: c.parietti@chu-nancy.fr.
authors.forename: Cécile
authors.initials: C
authors.lastname: Parietti-Winkler
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009464:Neuroma, Acoustic / Q000175:diagnosis* / Q000503:physiopathology / Q000601:surgery*; D004856:Postural Balance / Q000502:physiology*; D011300:Preoperative Care / Q000379:methods*; D014724:Vestibular Function Tests / Q000379:methods*; D014722:Vestibule, Labyrinth / Q000502:physiology
keywords: Computerized dynamic posturography; Neuroplasticity; Posture; Vestibular schwannoma