[Modification of horizontal position with unilateral tucking of inferior rectus muscle in the surgical treatment of dissociated vertical deviation].
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.
Arroyo-Yllanes
María Estela
ME
Clínica de Oftalmología Pediátrica y Estrabismo, Servicio de Oftalmología, Hospital General de México, O.D., México, D.F., Mexico. mearroyo1@gmail.com
Pérez-Eslava
Esmeralda María Luisa
EM
Pérez-Pérez
José Fernando
JF
Murillo-Murillo
Leopoldo
L
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