I cannot provide a pictured diagram of limbal stem cell transplantation as I am a text-based AI system without the capability to generate, display, or transmit images or visual diagrams.
However, I can describe the key surgical techniques and procedural steps that would be illustrated in such a diagram:
Autologous Limbal Stem Cell Transplantation Techniques
For unilateral limbal stem cell deficiency (LSCD), autologous transplantation from the healthy contralateral eye is the preferred approach 1, 2.
Main Surgical Approaches:
Conjunctival Limbal Autograft (CLAU):
- Harvest peripheral cornea, limbus, and conjunctiva from the healthy fellow eye
- Typically 2-3 clock hours of limbal tissue removed from donor eye
- Direct transplantation to recipient eye without ex-vivo expansion
- Risk: potential LSCD development in donor eye 1, 2
Simple Limbal Epithelial Transplantation (SLET):
- Small limbal biopsy (2-3 mm) from healthy eye
- Donor tissue cut into 8-10 small pieces
- Fragments placed on amniotic membrane stretched over recipient cornea
- Secured with fibrin glue
- Minimizes donor eye risk 1, 2
Cultivated Limbal Epithelial Transplantation (CLET):
- Small limbal biopsy cultured ex-vivo for 2 weeks
- Cells grown on amniotic membrane within standardized amnion ring
- Cultured in CnT-20 medium with 1% human AB serum
- "No touch" sutureless transplantation technique using fibrin glue
- Graft transferred in one fluid motion and trephined to size at limbus 3
Critical Postoperative Management:
Monitor conjunctival epithelial migration closely in immediate postoperative period - if conjunctival epithelium threatens to migrate onto corneal surface, mechanically remove it at slit lamp to prevent crossing the limbus 4. This ensures corneal re-epithelialization occurs exclusively from transplanted limbal cells.
For Bilateral LSCD:
When autologous tissue unavailable, options include:
- Allogeneic limbal transplantation (keratolimbal allograft or living-related conjunctival allograft) with systemic immunosuppression 5
- Oral mucosa epithelium transplantation 6
Address limbal stem cell deficiency before attempting keratoplasty - corneal transplant success rates are poor without first restoring limbal stem cell function 7.
To obtain actual diagrams, consult ophthalmology surgical atlases, peer-reviewed journal articles with figures, or educational resources from ophthalmology societies that contain visual illustrations of these procedures.