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March 1994

The Popping Peg Phenomenon

Author Affiliations

Ottawa, Ontario

Arch Ophthalmol. 1994;112(3):300-301. doi:10.1001/archopht.1994.01090150030008

A 51-year-old woman had a secondary hydroxyapatite implant (no covering used) put in place without complication. The second-stage drilling was done 10 months later and a flat-headed peg was put into position. Six weeks after drilling, while the ocularist was attempting to couple the peg to the prosthesis, the peg popped out. The peg was reinserted, and 3 to 4 minutes later, it spontaneously popped out again. The patient's conformer was put back into place and the patient was asked to return on another day, only to have the same problem occur.

Socket assessment revealed a papillary reaction on the conjunctival surface over a well-covered implant. The 10-mm peg was removed without difficulty and appeared normal. The peg hole also appeared normal. The peg was slipped back into position (Figure, top) and seemed to be well seated. Three to four minutes later, the peg spontaneously popped out (Figure, bottom). On

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