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

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.