Surgical Outcome of Disinserstion versus Myectomy for Eliminating Inferior Oblique Muscle Over-Action

Abstract

Objective: To compare the surgical outcome of disinsertion versus myectomy for eliminating inferior oblique muscle overaction.

Study Design: Experimental study

Place and Duration of Study: This study was conducted at the Al-Ibrahim Eye Hospital, Karachi from July 2021 to June 2022.

Materials and Methods: 80 patients with primary inferior oblique muscle overaction (IOOA) aged 6-20 years presenting to Al-Ibrahim eye hospital were included in the study after taking informed consent. A complete ophthalmic and orthoptic examination took place of all the patients, myectomy and disinsertion was performed on the patients by the same well experienced surgeon who had expertise in both these procedures. The follow up time period was 6 weeks and 12 weeks respectively with the data being collected on SPSS version 20.0. Chi-square test  was used to determine the level of significance which was set at p<0.05.

Results: 80 patients were part of the study, 39 (48.8%) were male and 41 (51.2%) were female with a mean age of 9.63±3.21 years. On 38 (37.5%) patients myectomy was performed and on 42 (42.5%) patients disinsertion was performed. No significant difference was seen between grades of IOOA at 6 and12 weeks of follow up (p=0.432). No significant difference was also not seen between the two surgical procedures (p=0.173).

Conclusion: Surgical outcome of disinsertion and myectomy both are equally effective and demonstrate no significant difference in eliminating inferior oblique overaction.