Table 4.
Time to failure of keratoprosthesis by additional surgical procedures performed at the same time as keratoprosthesis implantation.
| Procedure | Failure (n=21) | Retention (n=279) | |||
|---|---|---|---|---|---|
| rate (%) |
n | Mean Days to Failure (SE) |
n | p-value* | |
| Intracameral Steroid | 7.7 | 11 | 1431.9 ± 38.1 | 132 | 0.270 |
| Glaucoma Surgery | 4.8 | 1 | unstable | 20 | 0.563 |
| Pars Plana Vitrectomy | 8.6 | 6 | 979.3 ± 37.4 | 64 | 0.684 |
| Cataract Extraction | 16.4 | 9 | 589.1 ± 26.6 | 46 | 0.009 |
| IOL Removal | 3.1 | 1 | unstable | 31 | 0.549 |
| Iridectomy | 11.1 | 4 | 628.0 ± 23.6 | 32 | 0.414 |
| Iridoplasty | 12.5 | 2 | 929.7 ± 168.3 | 14 | 0.103 |
| Iridocorneal Synechiolysis | 0 | 0 | unstable | 15 | 0.373 |
| Tarsorrhaphy | 30.0 | 6 | 565.5 ± 68.6 | 14 | <0.0001 |
| Punctal Occlusion | 0 | 0 | unstable | 6 | 0.379 |
| Miscellaneous | 0 | 0 | unstable | 17 | 0.267 |
*
log-rank test
IOL = Intraocular Lens
SE = Standard Error
Mean days to failure is indicated because fewer than 25% (first quartile) of keratoprostheses failed for the majority of added procedures. Means indicated to be unstable were because the largest observation was censored and the estimation was restricted to the largest event time.