What it really tells you is that technology has improved a lot but nonetheless nothing is 100% foolproof.

There is some degree of imperfection and although the imperfections are small and the risk to the patient is low, our society and our patients' expectations are very high. Even though it is one in a thousand it is still unacceptable to our patients.

What we have done is look at each individual situation and look at the degree of risk the patient would be getting into.