Comparing Two Inferior Oblique Weakening Procedures: Disinsertion versus Myectomy

Area of Science:

• Ophthalmology
• Strabismus Surgery
• Pediatric Ophthalmology

Background:

• Inferior oblique overaction (IOOA) is a common cause of strabismus.
• Surgical intervention is often necessary to correct IOOA and improve binocular vision.

Purpose of the Study:

• To compare the efficacy of two surgical techniques for treating inferior oblique overaction (IOOA): muscle disinsertion versus myectomy.
• To evaluate postoperative outcomes, including deviations and torsional position.

Main Methods:

• A prospective interventional case series involving 36 patients (50 eyes) with IOOA.
• Patients were randomly assigned to undergo either inferior oblique myectomy or disinsertion.
• Outcomes assessed included changes in vertical/horizontal deviations, IOOA grading, and fundus extorsion.

Main Results:

• Both myectomy and disinsertion significantly reduced hyperdeviation in adduction (P=0.001 for both).
• Success rates for IOOA grading were high in both groups (87.4% myectomy, 92.3% disinsertion) with no significant difference (P=0.780).
• No statistically significant differences were observed between the groups in terms of vertical/horizontal deviations, V-pattern, or dissociated vertical deviation.

Conclusions:

• Both inferior oblique myectomy and disinsertion are effective surgical treatments for IOOA.
• The study found no significant difference in success rates or complication profiles between the two techniques.