ABSTRACT
ABSTRACT: Purpose: Superior oblique palsy is usually associated with inferior oblique(IO) muscle overaction, if the hypertropia in primary position(PP) is 15 , ordinary weakening of IO, often do not correct the hypertropia completely. In this study the effect of anterior transposition of IO in unilateral superior oblique palsy and 16-25 hypertropia in PP is evaluated. Methods: A prospective clinical trial was performed on 20 patients. Before surgery deviation was measured in the 9 cardinal positions, and was repeated 6 months after it. The data were statistically analyzed. Results: After surgery vertical deviation in the PP decreased from 20.70 1.90 to 2.10 2.50 (p 0.00001). In adduction this decrease, was from 29.20 to 5.20 (p 0.0001). In one patient the deviation was 5 at 6mo post-op. No case of hypotropia or diplopia was seen. In 4 patients mild limitation of up-gaze was encountered. Conclusion: Anterior transposition of IO muscle is a useful way to correct vertical deviation in unilateral superior oblique palsy with 16-25 hypertropia in the primary position.
