Traumatic wound rupture after penetrating keratoplasty in Africa
- aTennent Institute of Ophthalmology, Western Infirmary, Glasgow G11 6NT, bKikuyu Eye Unit, Kikuyu Hospital, Kenya, cDepartment of Statistics, Glasgow University
- Mr R J C Bowman, International Centre for Eye Health, Institute of Ophthalmology, 11–43 Bath Street, London EC1V 9EL.
- Accepted 25 November 1998
AIM To investigate risk factors, visual outcome, and graft survival for traumatic wound rupture after penetrating keratoplasty.
METHODS A retrospective analysis of 336 patients who underwent penetrating keratoplasty from 1988 to 1995.
RESULTS 19 patients (5.7%) suffered traumatic postoperative wound rupture requiring surgical repair. They were younger (mean age 16.6 years, 95% CI 13.2–20.6) and more frequently keratoconic (p = 0.01) than other patients (mean age 28.9 years, 95% CI 26.–31.0). Mean postoperative follow up was 37.7 (SD 22.9) months and 24.5 (18.9) months for the rupture and non-rupture patients. Mean interval between keratoplasty and rupture was 18 (21) weeks. The lens was damaged and removed in 37% of ruptured eyes. For keratoconics, the probability of graft survival at 5 years was lower (p = 0.03) in the ruptured eyes (75%) than in the non-ruptured eyes (90%). Endothelial failure was a more common (p <0.05) cause of graft opacification in ruptured grafts than in intact grafts. Of the ruptured eyes, 53% achieved a final corrected acuity of at least 6/18 and 63% achieved at least 6/60 compared with 48% and 71% of the intact eyes respectively (both p >0.1). The proportion of keratoconic eyes which achieved at least 6/60 was lower (p = 0.02) in the ruptured eyes (67%) than the non-ruptured eyes (87%). Eyes with wound ruptures of 5 clock hours or greater were less likely (p <0.05) to achieve an acuity of 6/18 and were more likely (p <0.05) to have an associated lens injury.
CONCLUSIONS Graft rupture is relatively common in African practice, particularly in young keratoconics. Visual outcome and graft survival are not significantly worse than for other grafted eyes, but are significantly worse than for other grafted keratoconic eyes.