Risk factors for the development of retroprosthetic membranes with Boston keratoprosthesis type 1: multicenter study results

Ophthalmology. 2012 May;119(5):951-5. doi: 10.1016/j.ophtha.2011.11.030. Epub 2012 Feb 22.

Abstract

Objective: The purpose of this study was to identify possible risk factors for retroprosthetic membrane (RPM) development in a large, multicenter cohort of patients receiving a Boston type 1 keratoprosthesis.

Design: Cohort study.

Participants: The final analysis included 265 eyes of 265 patients who underwent implantation of a Boston keratoprosthesis type I device between January 2003 and July 2008 by 1 of 19 surgeons at 18 medical centers.

Methods: Forms reporting preoperative, intraoperative, and postoperative parameters were prospectively collected and subsequently analyzed at a central data collection site.

Main outcome measures: The primary outcome was the presence or absence of an RPM during the follow-up period.

Results: The average age of patients was 63.3±19.1 years, 48.5% of the patients were female, and 52.5% of procedures were performed on the right eye. The mean follow-up time was 17.8±14.9 months. The majority (85.4%; n = 222) had undergone an average of 2.2±1.2 (range, 1-8) penetrating keratoplasties before keratoprosthesis implantation, and 38 eyes (14.6%) received a primary keratoprosthesis. The overall RPM formation rate was 31.7% (n = 84). The most significant risk factor for RPM development was infectious keratitis (as a surgical indication for keratoprosthesis surgery itself), resulting in a rate of RPM formation of 70.6%. As an independent risk factor, the hazard ratio (HR) of RPM development in these eyes was 3.20 (95% confidence interval, 1.66-6.17). Aniridia was also an independent risk factor for RPM development (HR, 3.13; 95% confidence interval, 1.10-8.89).

Conclusions: Formation of RPM is a common complication of keratoprosthesis surgery, occurring in approximately one-third of cases. Eyes at the highest risk of RPM development are those receiving corneal replacement for infectious keratitis and aniridia.

Publication types

  • Multicenter Study
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Artificial Organs*
  • Child
  • Cohort Studies
  • Cornea*
  • Corneal Diseases / surgery*
  • Corneal Transplantation
  • Female
  • Humans
  • Male
  • Membranes / pathology
  • Middle Aged
  • Postoperative Complications*
  • Prostheses and Implants*
  • Risk Factors
  • Young Adult