title: [Secondary hyperactivity of the contralateral oblique muscle after unilateral weakening of the inferior oblique muscle].
abstract: OBJECTIVE
  This study was designed to analyze the consecutive overaction of the contralateral inferior oblique (IO) muscle after unilateral weake in procedure of the same muscle which is a well-known but not regularly studied phenomenon.
  
  
  METHODS
  Unilateral weakening of overactive IO muscle was performed in a group of 27 patients with esotropia (14 recessions and 13 marginal myotomias). Eleven of these patients had unilateral overaction of the IO muscle. In the remaining 16 patients the overaction was highly asymmetric.
  
  
  RESULTS
  Postoperatively we observed only one consecutive overaction of the contralateral IO in patients with unilateral overaction. However, this condition was observed in 11 of 16 patients with asymmetric IO overaction.
  
  
  CONCLUSIONS
  The innervational pathogenesis of this phenomenon is a subject of discussion. The authors emphasize the necessity of the clinical examination in order to identify the bilateral asymmetric forms and to neutralize them by convenient surgical procedures.
authors: Service d'Ophtalmologie, Université d'Istanbul, Turquie.
authors: V
authors: V
authors: Oğuz
authors: K
authors: K
authors: Devranoğlu
authors: O
authors: O
authors: Arslan
authors: H
authors: H
authors: Tolun
authors: L
authors: L
authors: Celikkol
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D004948:Esotropia / Q000601:surgery*; D005500:Follow-Up Studies; D006801:Humans; D007223:Infant; D009801:Oculomotor Muscles / Q000503:physiopathology* / Q000601:surgery; D011184:Postoperative Period
vernacular_title: Hyperaction consécutive de l'oblique controlatéral après affaiblissement unilatéral de l'oblique inférieur.