title: [Modification of horizontal position with unilateral tucking of inferior rectus muscle in the surgical treatment of dissociated vertical deviation].
abstract: BACKGROUND
  Unilateral tucking of the inferior rectus muscle is a therapeutic alternative in the surgical treatment of dissociated vertical deviation (DVD). It is usually performed in asymmetric DVD associated with monocular low vision. Adduction is a secondary action of the inferior rectus muscle. If excessive reinforcement is done, the horizontal position can be modified toward esotropia. We undertook this study to evaluate the horizontal position modification after unilateral tucking of the inferior rectus muscle.
  
  
  METHODS
  Unilateral tucking of the inferior rectus muscle was done in 10 patients with spontaneous DVD, without horizontal surgery and poor monocular vision. Follow-up was done for 6 months. Horizontal deviation in prism diopters (PD) was measured. For statistical analysis, Mann-Whitney U test was used with a significance level of 0.05.
  
  
  RESULTS
  Preoperatively, horizontal deviation was between 20 PD of exotropia and 10 PD of esotropia (+/-10.34 SD). Postoperatively, horizontal deviation was between 12 PD of exotropia and 15 PD of esotropia (+/-7.82 SD). Horizontal deviation was modified between 2 and 15 PD towards esotropia, on average 9.4 PD (+/-3.70 SD) ( p = 0.03).
  
  
  CONCLUSIONS
  Monocular inferior rectus muscle reinforcement modifies the horizontal position on average 9.4 PD towards esotropia.
authors: Clínica de Oftalmología Pediátrica y Estrabismo, Servicio de Oftalmología, Hospital General de México, O.D., México, D.F., Mexico. mearroyo1@gmail.com
authors: María Estela
authors: ME
authors: Arroyo-Yllanes
authors: Esmeralda María Luisa
authors: EM
authors: Pérez-Eslava
authors: José Fernando
authors: JF
authors: Pérez-Pérez
authors: Leopoldo
authors: L
authors: Murillo-Murillo
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D004948:Esotropia / Q000601:surgery*; D005099:Exotropia / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male; D009801:Oculomotor Muscles / Q000601:surgery*; D013508:Ophthalmologic Surgical Procedures / Q000379:methods; D011446:Prospective Studies; D055815:Young Adult