Inferior oblique belly transposition for V pattern strabismus.

Area of Science:

• Ophthalmology
• Strabismus Surgery

Background:

• Inferior oblique muscle belly transposition (IOMBT) is known to weaken inferior oblique overaction and correct hypertropia.
• V pattern strabismus with upshoot in adduction presents a surgical challenge.

Purpose of the Study:

• To evaluate the efficacy of IOMBT in treating V pattern strabismus with upshoot in adduction.
• To assess the impact of IOMBT on V pattern magnitude and upshoot severity.

Main Methods:

• Retrospective review of 13 patients with V pattern strabismus and upshoot in adduction who underwent bilateral IOMBT.
• Inclusion criteria: V pattern 15-25 pd, upshoot +1 to +3, minimal primary gaze deviation.
• Measurements included pre- and postoperative V pattern angle and upshoot grade.

Main Results:

• Complete resolution of V pattern was achieved in all 13 patients.
• V pattern decreased from a mean of 18.92 pd to 3.46 pd.
• Mean upshoot grade reduced from 1.92 to 0.12, with no consecutive A pattern or depression in adduction.

Conclusions:

• IOMBT is a successful surgical option for V pattern strabismus with mild to moderate upshoot in adduction.
• This technique effectively eliminates V patterns and upshoots, offering a valuable addition to strabismus surgical options.