To observe the clinical characteristics and efficacy of medial rectus muscle injury induced by nasal endoscopic sinus surgery.

The clinical data of 15 cases with medial rectus muscle injury induced by nasal endoscopic sinus surgery from Oct. 2016 to May 2019 in The First Affiliated Hospital of Zhengzhou University were retrospectively analyzed. The injury degree of medial rectus muscle was estimated according to the results of pull test, MRI and CT. These patients were divided into group A, 6 cases with partial dissociation of the medial rectus muscle, and group B, 9 cases with complete dissociation of the medial rectus muscle. The efficacy were analyzed and compared between the two groups.

The exotropia degree before and after treatment in group A was (55.83±12.81) PD and (6.67±2.58) PD (t=9.214, P=0.000). The exotropia degree before and after treatment in group B was (90.55±8.08)PD and (17.78±5.07)PD(t=22.891, P=0.000). The degree grading of restriction of internal rotation before and after treatment in group A was (2.50±0.55) grades and (1.00±0.00) grades (t=6.708, P=0.000). The degree grading of restriction of internal rotation before and after treatment in group B was (4.00±0.00) grades and (2.11±0.33) grades (t=17.000, P=0.000). The symptoms of diplopia were gone in 6 cases and improved in 9 cases.

The results of imaging examination and pull test can be used to guide and design the individuated treatment plan for medial rectus muscle injury induced by nasal endoscopic sinus surgery, and can obtain good efficacy.

Endoscopy; Otorhinolaryngologic surgical procedures; Postoperative complications; Oculomotor muscles; Exotropia; Ophthalmologic surgical procedures