An ultrasonographic study of the persistence of buckle height three years after segmental sponge explants.

We studied a consecutive series of rhegmatogenous retinal detachments treated with segmental silicone sponge explants and cryotherapy, with or without drainage, approximately three years postoperatively by ultrasonography to determine the degree and persistence of the height of the buckle measuring 1.5 to 3 mm remained in all patienst examined clinically and ultrasonographically at three years or later. Five of these patients reexamined one year later demonstrated no loss of buckle height between the third and fourth postoperative years. By comparison, in a small group of patients examined early in their postoperative course (2.5 to 4 months), the buckles were only slightly higher than in the group studied at three years. Buckle height thus appeared to stabilize relatively quickly postoperatively and to persist at least three years. We believe encapsulation of the sponge by scar tissue must contribute to the long-term maintenance of buckle height.