Efficacy of Superior Rectus and Lateral Rectus Muscle Belly Union Surgery for Myopic Strabismus Fixus

【Abstract 】 Objective To evaluate the effectiveness of superior rectus （SR） and lateral rectus (LR) union suture without scleral fixation for the treatment of myopic strabismus fixus. Methods A retrospective review was performed on 27 eyes of 16 patients who underwent lateral part of SR and superior part of LR muscle belly union between January 2010 and October 2015. We collected the ocular data including: best corrected visual acuity, axial length, CT or MRI images, orthoptic measurements (by prism test), and eye movements pre- and postoperatively. Results The follow up time varied from 3-12 months. All of the patients got satisfactory results except two severe cases. A statistical change of prism test value and eye movement was noticed ( P<0.01). Orthoptic measurements showed that the mean esotropia was improved from (92.50±18.17)△ preoperatively to (9.19±4.39)△ postoperatively ( P＜0.01). In regards for the vertical deviation, the mean residual hypotropia was (2.38±3.10)△ postoperatively compared to (21.88±5.74)△ preoperatively ( P＜0.01). At the last follow-up, mean abduction limitation was improved from -3.19±0.62 to -1.15±0.52 ( P＜0.01), mean elevation limitation was improved from -2.85±0.82 to -0.78±0.51 ( P＜0.01). No special complications were noted. Conclusion Muscle belly suture of SR and LR was an effective surgery to correct ocluar misalignment and motility in myopic strabismus fixus.