title: [Split-cornea transplantation - a novel concept to reduce corneal donor shortage].
abstract: BACKGROUND
  Penetrating keratoplasty is at present the gold standard for corneal transplantation, but tremendous progress has been made in recent years in improving lamellar keratoplasty techniques, such as deep anterior lamellar keratoplasty (DALK) and Descemet membrane endothelial keratoplasty (DMEK). The purpose of this report is to describe split-cornea transplantation by combining DALK and DMEK as a novel concept to reduce donor shortage.
  
  
  METHODS
  The study consists of a PUBMED literature review and our own clinical results.
  
  
  RESULTS
  Splitting of a single donor cornea into an anterior part (including epithelium, its basement membrane, Bowman layer, and stroma) for use in a DALK procedure in a patient with anterior-stromal disease (e. g., keratoconus) and into a posterior part (endothelium-Descemet membrane layer) for use in a DMEK procedure in a patient with endothelial disease (e. g., Fuchs endothelial dystrophy) can reduce the need for corneal donor tissue by around 50 %. A short-term 6-months follow-up has revealed good visual and refractive outcomes with low complication rates and acceptable endothelial cell loss.
  
  
  CONCLUSIONS
  Split-cornea transplantation by combining DALK and DMEK surgeries is a promising concept to reduce donor shortage in corneal transplantation surgery in the future.
authors.affiliation: Universitätsklinikum Köln, Kerpener Straße 62, 50924 Köln. ludwig.heindl@uk-koeln.de
authors.forename: L M
authors.initials: LM
authors.lastname: Heindl
authors.forename: C
authors.initials: C
authors.lastname: Cursiefen
mesh_terms: D016039:Corneal Transplantation / Q000379:methods* / Q000639:trends*; D006801:Humans; D057129:Iridocorneal Endothelial Syndrome / Q000175:diagnosis* / Q000601:surgery*; D019520:Living Donors