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Morphological study of extraocular muscles in dissociated vertical deviation by magnetic resonance imaging

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Author:
No author available
Journal Title:
Chinese Journal of Ophthalmology
Issue:
3
DOI:
10.3760/cma.j.cn112142-20220801-00377
Key Word:
斜视;动眼肌;磁共振成像;Strabismus;Oculomotor muscles;Magnetic resonance imaging

Abstract: Objective:To observe the changes of pulley locations and muscle volumes of extraocular rectus muscles in dissociated vertical deviation.Methods:This was a cross-sectional study. Data was collected from January 2020 to December 2020 in Tianjin Eye Hospital. The pulley locations and muscle volumes of extraocular rectus muscles in DVD patients and healthy volunteers were observed and calculated by continuous coronal MRI scan. One-way ANOVA and independent sample T test were used for statistical analysis. According to the examination results, Groups were divided into A (symmetric DVD), B (asymmetric DVD) and C (healthy volunteers). Data of symmetric DVD patients were divided into dominant eye (A-D) and non-dominant eye (A-nD), while that of asymmetric DVD patients were divided into severe DVD (B-s) and mild DVD (B-m). Volume of 4 rectus muscles and superior oblique muscle were calculated and compared to Group C, respectively.Results:Group A included 5 patients (10 eyes), 2 males and 3 females, aged (22±4) years; Group B included 4 patients (8 eyes), 2 males and 2 females, aged (28±8) years; Group C included 10 patients (20 eyes), including 4 males and 6 females, aged (25±6) years. There was no significant differences in age( F=0.45, P=0.648)or gender( χ2=0.78; P=0.833)among the three groups. There was no significant difference in pulley locations of extraocular rectus muscles between the three groups ( FMR=0.52, FLR=0.62, FSR=0.72, FIR=1.16;all P>0.05). Among the four exterocular rectus muscles, the muscle volume of MR [A-D: (562.8±64.4) mm 3,A-nD: (560.6±53.2) mm 3,B-s: (557.0±48.7) mm 3,B-m: (551.5±45.8) mm 3], LR [A-D: (519.8±44.5) mm 3,A-nD: (511.0±49.4) mm 3,B-s: (501.0±35.6) mm 3,B-m: (498.3±45.3) mm 3] and SR [A-D: (472.8±66.9) mm 3,A-nD: (449.4±41.7) mm 3,B-s: (433.0±60.8) mm 3,B-m: (412.5±54.5) mm 3] in group A and group B was higher than that in group C [MR: (423.3±51.9)mm 3,LR: (439.7±35.3)mm 3,SR: (328.1±36.5)mm 3], and the difference was statistically significant (All P<0.05). The inferior rectus muscle volume of dominant eye in group A and mild DVD eye in group B was significantly different from that of healthy volunteers in group C [(453.8±46.8) and (463.0±16.6) vs. (380.4±59.7) mm 3, respectively], and the difference was statistically significant (all P<0.05). Conclusions:There are no significant changes in pulley locations of extraocular rectus muscles in patients with symmetric and asymmetric DVD, and the muscle volumes of medial, lateral and superior rectus muscle are greater than those of healthy people. However, the muscle volumes of inferior rectus muscle of dominant eye in symmetric DVD and mild DVD eye are significantly greater.

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