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Clinical features and surgical management of traumatic acquired isolated superior rectus palsy.

PURPOSE: Isolated acquired superior rectus palsy (ASRP) is extremely rare. The goal of this report is to describe the clinical manifestations and surgical protocols for treatment of isolated traumatic ASRP.

DESIGN: Retrospective observational case series.

METHOD: Records of patients presenting with traumatic isolated ASRP from 2011 to 2020 were retrospectively reviewed. Variables analyzed included nature of the damage, ocular alignment, ocular motility, binocular vision, fundus photography, imaging and surgical treatment.

RESULT: Of the 23,498 strabismus surgeries performed, 16 (0.07%) were identified as being attributable to traumatic isolated ASRP. Iatrogenic injury during orbital/brain tumorectomy was the most common cause for ASRP, followed by injury resulting from a sharp object, blunt instrument, car accident, dog bite, accidental fall and explosion. The main clinical features were hypotropia and deficient supraduction of the affected eye, accompanied by exotropia, extorsion, decreased vision and ptosis. The imaging examination showed the superior orbital wall fracture in 3 cases and superior rectus rupture in 7 cases. Inferior rectus recession and/or superior rectus resection comprised the major surgical procedures employed for these cases. Vertical deviations were reduced from 45.60 ± 17.52 PD preoperatively to 12.20 ± 12.97 PD postoperatively after an average of 22.70 months at follow-up, with a success rate of 50%.

CONCLUSION: Traumatic isolated ASRP comprised only 0.07% of cases receiving strabismus surgery at our hospital. Orbital imaging is essential to identify whether muscle rupture, orbital fractures and/or other possible disorders are present. Superior rectus resection and inferior rectus recession represented the most frequently used surgical procedures.

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