J Korean Ophthalmol Soc.  2015 Sep;56(9):1424-1431. 10.3341/jkos.2015.56.9.1424.

The Effect of Inferior Oblique Muscle Transposition in Primary and Secondary Inferior Oblique Muscle Overaction

• Kim JS
• Park SE

• KMID: 2214559
• DOI: http://doi.org/10.3341/jkos.2015.56.9.1424

Abstract

PURPOSE
To evaluate and compare the effect of transposition of inferior oblique muscle in patients with primary inferior oblique muscle overaction and secondary due to superior oblique muscle palsy.
METHODS
The present study included 41 patients (53 eyes), who appeared to have primary or secondary inferior oblique muscle overaction due to superior oblique muscle palsy and received transposition of inferior oblique muscle with at least 3 months of follow-up. Patients were retrospectively analyzed to compare the effect of correction and its prognosis. Inferior oblique muscle overaction was graded as +1 to +4 according to the severity. Successful surgery was defined as postoperative inferior oblique muscle overaction from 0 to +1 and failure as above +2. Hypertropia in primary gaze was also recorded to evaluate the effect of correction.
RESULTS
Twenty-six (35 eyes) and 15 (18 eyes) patients with primary and secondary inferior oblique muscle overaction due to superior oblique muscle palsy, respectively, received transposition of inferior oblique muscle. Patients with primary inferior oblique muscle overaction showed correction of 2.1 +/- 0.9 with preoperative inferior oblique muscle overaction of 2.0 +/- 0.7. Patients with secondary inferior oblique muscle overaction showed a correction of 2.3 +/- 0.9 with preoperative value of 2.3 +/- 0.8. Each 3.2 +/- 4.1 prism diopters (PD) and 6.5 +/- 5.3 PD of hypertropia at primary gaze showed correction of 3.0 +/- 7.4 PD and 6.3 +/- 5.1 PD, respectively, in each group.
CONCLUSIONS
Primary and secondary inferior oblique muscle overaction due to superior oblique muscle palsy showed no difference in correction of overaction and hypertropia after transposition of inferior oblique muscle. Except for presence of inferior oblique muscle underaction, the correction appears effective with good prognosis.

Keyword

Inferior oblique muscle overaction; Superior oblique muscle palsy; Transposition

MeSH Terms

Follow-Up Studies
Humans
Paralysis
Prognosis
Retrospective Studies
Strabismus

Figure

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  Figure 1. Schematic diagram showing IO placement in four grades (right eye, viewed from below). (A) Grade I: IO place-ment-4 mm posterior and 2 mm lateral to IR insertion. (B) Grade II: IO placement-4 mm posterior to IR insertion. (C) Grade III: IO placement-at IR insertion. (D) Grade IV: IO placement-full anteriorization with ‘J’ deformity. IO = inferior oblique muscle; IR = inferior rectus muscle.

Reference

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