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An Unexpected Outcome of Blunt Ocular Trauma: Rupture of Three Muscles

Introduction: Traumatic strabismus due to isolated extraocular muscle rupture is uncommon. Treatment usually depends on the severity of both the subjective and objective findings. Methods: We report a male patient with restricted abduction and supraduction in the right eye follow ing a blunt ocular trauma. The exploration revealed the rupture of superior rectus, superior oblique, and lateral rectus muscles. Only lateral rectus muscle could be sutured to the proximal segment. Superior rectus and superior oblique muscles were severed brutally, so that repairing was not possible. Results: On the day after exploration and primary suturation, there was 25 prism diopters (PD) hypotropia and 15 PD esotropia in his right eye with severe limited supraduction and abduction. His major complaint was a large vertical diplopia which resolved partially with the prismatic glasses prescribed. After 6 months follow-up, medial rectus and inferior rectus recession was performed in the right eye. The patient had a limited but improved abduction after the operation. He was orthotropic and had a single binocular vision in the primary position. Discussion: In suspected extraocular muscle ruptures, orbital imaging methods and surgical exploration should be considered promptly. MRI may be mandatory to demonstrate the severed muscles in cases with persistent diplopia and normal CT. Prognosis is usually better in patients having partial extraocular muscle damage and treatment options should be evaluated on patient basis.