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Original ArticleOpen Access
The Surgical Outcome of Inferior Oblique Recession on Bilateral Superior Oblique Palsy in Children
Masaya-anon P 
,
Subhangkasen I ,
Hiriotappa J
,
Subhangkasen I ,
Hiriotappa J Objective: To study the surgical effects of bilateral graded inferior oblique muscle (IO) recession on the
reduction of the V pattern deviation and severity of inferior oblique muscle overaction (IOOA) in children who
had bilateral superior oblique muscle palsies(SOP) with secondary inferior oblique muscle overaction.
Material and Method: Seven patients who presented with bilateral SOP with secondary IOOA were included.
All patients had V pattern deviation and bilateral graded IO recession was done. The data of age, sex,
deviation in primary position, V pattern and severity of IOOA was recorded both pre- and post -operatively.
The comparison of pre-operative and post-operative amount of V pattern and IOOA was analyzed with nonparametric
statistical analysis.
Results: Four females and three males had the average age of 5.7 + 1.8 years old. The mean pre-operative
severity of IOOA was + 3 and the mean pre-operative deviation of the V pattern was 36 + 11.4 prism diopters
(PD). The mean post-operative severity of IOOA was + 0.4 and of V pattern deviation was 10.7 + 4.4 PD.
Comparing the pre-operative and post-operative severity of IOOA and V pattern deviation by non-parametric
statistical analysis and the result was statistically significant.
Conclusion: Bilateral graded IO recession is an effective surgical procedure to reduce the V pattern and the
severity of IOOA in the children who are suffering from bilateral SOP with secondary IOOA.
Keywords: Eye movements, Oculomotor muscles, Bilateral superior oblique palsy, V pattern, Inferior oblique
recession
reduction of the V pattern deviation and severity of inferior oblique muscle overaction (IOOA) in children who
had bilateral superior oblique muscle palsies(SOP) with secondary inferior oblique muscle overaction.
Material and Method: Seven patients who presented with bilateral SOP with secondary IOOA were included.
All patients had V pattern deviation and bilateral graded IO recession was done. The data of age, sex,
deviation in primary position, V pattern and severity of IOOA was recorded both pre- and post -operatively.
The comparison of pre-operative and post-operative amount of V pattern and IOOA was analyzed with nonparametric
statistical analysis.
Results: Four females and three males had the average age of 5.7 + 1.8 years old. The mean pre-operative
severity of IOOA was + 3 and the mean pre-operative deviation of the V pattern was 36 + 11.4 prism diopters
(PD). The mean post-operative severity of IOOA was + 0.4 and of V pattern deviation was 10.7 + 4.4 PD.
Comparing the pre-operative and post-operative severity of IOOA and V pattern deviation by non-parametric
statistical analysis and the result was statistically significant.
Conclusion: Bilateral graded IO recession is an effective surgical procedure to reduce the V pattern and the
severity of IOOA in the children who are suffering from bilateral SOP with secondary IOOA.
Keywords: Eye movements, Oculomotor muscles, Bilateral superior oblique palsy, V pattern, Inferior oblique
recession
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