Comparison of lateral rectus muscle re-recession and medial rectus muscle resection for treatment of postoperative exotropia.

Am J Ophthalmol

Departments of Ophthalmology and Visual Sciences and Pediatrics, St Louis Children's Hospital, Washington University School of Medicine, St Louis, Missouri.

Published: April 2015

Purpose: To compare the outcomes of unilateral lateral rectus muscle re-recession and medial rectus muscle resection for treatment of recurrent or persistent exotropia.

Design: Retrospective nonrandomized clinical trial.

Methods: setting: Hospital-based clinical practice.

Patient Population: Forty patients with recurrent or persistent exotropia following bilateral lateral rectus muscle recessions.

Intervention: Fourteen patients were treated with unilateral medial rectus muscle resection and 26 with unilateral lateral rectus muscle re-recession.

Main Outcome Measures: Outcomes were considered successful if the patients had deviations less than 10 prism diopters (PD) at last follow-up. All patients were followed for at least 1 year postoperatively.

Results: The mean preoperative deviations were 17.4 PD in the medial rectus muscle resection group and 18.1 PD in the lateral rectus muscle re-recession group. Successful outcomes were achieved in 9 of 14 patients (64%) treated with medial rectus muscle resection and 19 of 26 patients (73%) treated with lateral rectus muscle re-recession. There was no statistically significant difference between these outcomes. Mean follow-up was 4.5 years in the medial rectus muscle resection group and 2.9 years in the lateral rectus muscle re-recession group.

Conclusions: Surgery on a single muscle can be used to treat moderate-angle recurrent or persistent exotropia. Unilateral re-recession of the lateral rectus muscle and medial rectus muscle resection have equivalent success rates.

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http://dx.doi.org/10.1016/j.ajo.2015.01.020DOI Listing

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