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Related Experiment Videos

Superior oblique tenectomy in a pattern strabismus.

Z F Pollard

    Annals of Ophthalmology
    |February 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Surgery for A-pattern strabismus involving superior oblique muscle overaction showed significant correction in downgaze but minimal effect in primary gaze. Bilateral superior oblique tenectomy is a safe surgical approach for these complex cases.

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    Area of Science:

    • Ophthalmology
    • Strabismus Surgery
    • Pediatric Ophthalmology

    Background:

    • A-pattern strabismus is characterized by a specific deviation pattern.
    • Overacting superior oblique muscles are a common finding in A-pattern strabismus.
    • Surgical management of A-pattern strabismus requires careful consideration of muscle function.

    Purpose of the Study:

    • To evaluate the surgical outcomes of treating A-pattern strabismus with superior oblique muscle overaction.
    • To assess the efficacy of bilateral superior oblique tenectomy, with or without concurrent horizontal muscle surgery.

    Main Methods:

    • Surgical evaluation of 19 patients with A-pattern exotropia and 1 with A esotropia, all exhibiting bilateral superior oblique overaction.
    • Group 1: 9 patients with A-pattern exotropia and <= 20 prism diopters (PD) primary position deviation underwent bilateral superior oblique tenectomy alone.

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  • Group 2: 11 patients with >= 25 PD primary position deviation underwent bilateral superior oblique tenectomy plus horizontal rectus muscle surgery.

    • Main Results:

    • In Group 1, bilateral superior oblique tenectomy resulted in minimal primary position correction but an average of 35 PD correction in downgaze.
    • In Group 2, combined surgery yielded good results without accounting for potential primary position effects of the tenectomy.
    • Superior oblique tenectomy demonstrated effectiveness primarily in downgaze deviations.

    Conclusions:

    • Bilateral superior oblique tenectomy is a safe and effective surgical method for managing A-pattern strabismus with superior oblique overaction.
    • The surgical plan can be simplified by recognizing that superior oblique muscle abduction occurs mainly in downgaze.
    • Concurrent horizontal muscle surgery can be performed safely with superior oblique tenectomy in more complex cases.