J Med Assoc Thai 2017; 100 (10):1116

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The Results of Inferior Oblique Muscle Weakening Surgery
Chinkulkitnivat B , Tengtrisorn S Mail, Singha P , Rattanalert N

Objective: To study the final outcomes of inferior oblique muscle weakening surgery.

Material and Method: A retrospective study of 81 patients that underwent inferior oblique muscle weakening surgery at Songklanagarind Hospital between January 1, 2008 and December 31, 2014. We studied the results of preoperative to postoperative grading of Inferior oblique overaction (IOOA). The angle deviation of dissociated vertical deviation (DVD) as well as possible complications of unilateral inferior oblique anterior transposition (IOAT) were analyzed.

Results: Out of the 124 eyes that underwent inferior oblique recession (IOR), the mean age of examination was 8.24 years (2, 28). The mean age at time of surgery was 10.25 years (2, 36). The mean follow-up period was 32.10 months (6, 62). Most patients changed from a preoperative grading of IOOA +2 (62.2%) to a 0 (95.2%) grading at the last follow-up. From twenty eyes, that underwent IOAT, the mean age of examination was 8.88 years (6, 16). The mean age at time of surgery was 11.10 years (6, 20). From the one month to one year period of follow-up, most patients changed from a preoperative 10 to 14 Prism Diopter (PD) angle deviation of DVD group (45%) to a 0 to 4 PD angle deviation of DVD group (62.5%). Postoperative hypotropia, antielevation syndrome, and larger DVD in the opposite eye was not found.

Conclusion: IOR and IOAT are effective procedures for inferior oblique muscle weakening surgery. Unilateral IOAT resulted in the long-term improvement of DVD, along with the grading of IOOA. We did not find any complications of unilateral IOAT in our study.

Keywords: Inferior oblique recession, Inferior oblique anterior transposition, Effective procedure


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