title: Spontaneous loosening of hydroxyapatite peg sleeves.
abstract: OBJECTIVE
  To report a new complication associated with pegging hydroxyapatite orbital implants: spontaneous loosening of the sleeve.
  
  
  METHODS
  Retrospective noncomparative case series.
  
  
  METHODS
  Four patients ranging in age from 38 to 60 years participated.
  
  
  METHODS
  Four patients are described who successfully received hydroxyapatite orbital implants with motility peg and sleeve systems. In each case spontaneous loosening of the sleeve developed.
  
  
  METHODS
  Clinical and surgical outcomes were assessed.
  
  
  RESULTS
  Three patients had the peg and sleeve removed followed by repair of the peg hole, and one patient had placement of a larger diameter peg and sleeve system. All patients did well.
  
  
  CONCLUSIONS
  Problems have been reported when motility coupling pegs are used with hydroxyapatite orbital implants. Spontaneous loosening of the sleeve is another potential complication to discuss with the patient considering an implant peg.
authors.affiliation: University of Ottawa Eye Institute, Ottawa, Ontario, Canada.
authors.forename: D R
authors.initials: DR
authors.lastname: Jordan
mesh_terms: D000328:Adult; D017886:Durapatite; D015353:Eye Enucleation; D006801:Humans; D008297:Male; D008875:Middle Aged; D009915:Orbit / Q000601:surgery; D020273:Orbital Implants; D011183:Postoperative Complications / Q000473:pathology*; D011475:Prosthesis Failure; D012189:Retrospective Studies
chemical_list: D017886:Durapatite