TITLE

The Effect of Inferior Oblique Muscle Z Myotomy in Patients With Inferior Oblique Overaction

AUTHOR(S)
Se Yup Lee; Hyun Kyung Cho; Hyun Kyung Kim; Young Chun Lee
PUB. DATE
November 2010
SOURCE
Journal of Pediatric Ophthalmology & Strabismus;Nov/Dec2010, Vol. 47 Issue 6, p366
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Purpose: To investigate the surgical outcomes of inferior oblique muscle Z myotomy in patients with inferior oblique overaction (IOOA).Methods: A prospective study was performed in 21 patients (primary IOOA in 13 patients, secondary IOOA in 8 patients) who underwent inferior oblique muscle Z myotomy. Patients with IOOA under the degree of +2 were included. Seventy percent of Z myotomies were performed at 6 mm along the physiological path after identifying the inferior oblique muscle through an inferotemporal fornix incision. A comparison was made before the operation and 3 months postoperatively on the degree of IOOA, vertical deviation, and cyclotorsion.Results: Simultaneous horizontal rectus surgery was performed with inferior oblique muscle Z myotomy because all patients had combined horizontal deviation. The mean degrees of preoperative and postoperative IOOA were +1.9 ± 0.32 and +0.7 ± 0.67 in the primary IOOA group and +1.83 ± 0.41 and +0.17 ± 0.41 in the secondary IOOA group. Six of 7 patients in the primary IOOA group showed V-pattern strabismus, which was improved in all cases after the operation. In the secondary IOOA group, changes of preoperative and postoperative hypertropia and cyclodeviation were from 7.75 ± 6.64 prism diopters and 8.6 ± 2.31° to 1.2 ± 3.35 prism diopters and 4.7 ± 2.02°, respectively. Inadvertent complete myotomy occurred in 1 patient due to excessive traction by an assistant during the procedure.Conclusion: Inferior oblique muscle Z myotomy was an effective surgical procedure in patients with primary and secondary IOOA under the degree of +2.
ACCESSION #
55545506

 

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