Anterior and nasal transposition of the inferior oblique muscle: a preliminary case report on a new procedure.

To describe this new extraocular muscle surgery.Case Report of a child in need of treatment of a weak superior oblique muscle which, at surgery, was in fact found to be absent. After a prior only partially successful recession of the antagonist inferior oblique (IO), the IO muscle was detached and transposed to a new insertion in the inferior nasal quadrant converting the muscle, as a result of its functional origin being the neurovascular bundle ["Ligament of Stager"-ed], from an extorter and elevator of the globe to an intorter and depressor.Satisfactory binocular alignment was achieved.This new surgical procedure provides significant advantages, and should be added to our surgical armamentarium.