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Medial Rectus Advancement for Secondary Exotropia
Allison C Umfress1, Alexis M Flowers1, Yuhan Liu2
1Vanderbilt Eye Institute, Vanderbilt University Medical Center, Nashville, Tennessee, USA.
American Journal of Ophthalmology
|August 24, 2020
Summary
Medial rectus advancement surgery shows success in treating secondary exotropia. Preoperative adduction deficits predict stretched scars, requiring more extensive surgery and potentially leading to exodrift.
Area of Science:
- Ophthalmology
- Strabismus Surgery
- Oculomotorics
Background:
- Secondary exotropia is a common form of strabismus.
- Medial rectus advancement is a surgical technique used to correct eye alignment.
Purpose of the Study:
- To evaluate the preoperative characteristics and surgical outcomes of medial rectus advancement in patients with secondary exotropia.
Main Methods:
- A retrospective analysis of 221 patients who underwent medial rectus advancement surgery for secondary exotropia.
- Surgical success was defined by postoperative deviation measurements at 1 week and 2 months.
Main Results:
- Success rates at 2 months varied by surgical approach: 66.7% for unilateral medial rectus advancement (UMRadv), 62.1% for UMRadv with lateral rectus recession (LRc), and 56% for bilateral medial rectus advancement (BMRadv).
- Preoperative adduction deficits were linked to intraoperative stretched scars, requiring more surgical correction.
- Exodrift occurred in 38.6% of patients, notably more in the BMRadv group.
Conclusions:
- Medial rectus advancement provides successful surgical outcomes for secondary exotropia.
- Adduction deficits indicate stretched scars, necessitating increased surgical intervention.
- Anticipating exodrift by aiming for slight overcorrection may improve long-term results.