Hang-back Retropostion as a Variant Weakening of Oculomotoric Muscles

Overview

In a clinical study the authors evaluate efficiency of the operation on oculomotoricmuscles by the hang-back retroposition method. A total of 70 children have beenoperated on, 52 of the patients suffering from esotropia and 18 from exotropia.The mean preoperation deviation in esotropia was 30±12 pdpt, the postoperationdeviation was in the range of 6±7 pdpt. In the exotropia cases the preoperationdeviation improved from original 76.9%, in the exotropia group being 77.8%. Theoverall success rate of the hang-back retroposition in all these patients was 77.1%.Ina group of children operated on by a traditional retroposition there was anoverall success rate 78.7% (77.6% in esotropia and 82.4% in exotropia cases).Hang-backretropositionhasbeenequally effective as the traditional retropositionof oculomotoric muscles. Its main advantages include visibility of the operationfield, minimum risk of perforation of sclera and a fair time factor of the intervention.The authors discuss the development, indications, further advantages but alsopossible disadvantages or limitations of this acknowledged surgical procedure instrabology.

Key words:
hang-back, semi hang-back, retroposition, pseudoinsertion, esotropia,exotropia