Long-term prognosis of repeat Type I Boston keratoprosthesis

Area of Science:

• Ophthalmology
• Biomaterials Science
• Regenerative Medicine

Background:

• Corneal blindness necessitates advanced prosthetic solutions.
• The Boston Type I keratoprosthesis (B-KPro) restores vision but carries a risk of implant failure.
• Repeat B-KPro offers a potential salvage option for vision restoration.

Purpose of the Study:

• To evaluate the long-term efficacy and safety of repeat Boston Type I keratoprosthesis (B-KPro) implantation.
• To compare the outcomes of repeat B-KPro with initial B-KPro procedures.
• To assess visual acuity and implant survival rates after repeat B-KPro surgery.

Main Methods:

• Retrospective cohort study design.
• Analysis of 18 patients undergoing two B-KPro implantations in the same eye.
• Primary endpoints: implant failure rate and visual acuity at last follow-up (mean 8.1 years).

Main Results:

• Repeat B-KPro demonstrated a significantly lower 5-year failure rate (11.11%) compared to initial B-KPro (88.89%).
• Visual acuity better than 20/200 was achieved in 30.09% (3 years) and 24.07% (6 years) post-repeat B-KPro.
• While phthisis incidence increased, rates of hypotony, endophthalmitis, corneal melt, and extrusion were lower after repeat B-KPro.

Conclusions:

• Repeat B-KPro surgery can achieve sustained visual acuity above 20/200 following initial implant failure.
• The repeat procedure shows improved implant survival rates compared to the first implantation.
• Further research with larger patient cohorts is recommended to fully elucidate risks and benefits.