Independent sector treatment centres (ISTCs) were introduced in October 2003 in the United Kingdom in order to reduce waiting times for elective operations and to improve patient choice and experience. Many concerns have been voiced from several authorities over a number of issues related to these centres. One of these concerns was regarding the practice of ‘cherry-picking’. Trusts are paid according to ‘payment by results’ at national tariffs. The national tariff is an average of costs occurring in an average mix of patients. The assumption is that the higher the co-morbidities of the patients the more likely they are to consume a higher amount of resource and to require a longer length of stay. Cherry-picking may also affect the quality of training available to trainees.

This audit was aimed at identifying if, and how much this practice occurs. It also identifies what affect this has on the case-load of patients left for the NHS hospitals.

We looked at the number of co-morbidities amongst 198 consecutive patients undergoing hip and knee primary total arthroplasty at an ISTC, a district general hospital whose PCTs provide patient to the ISTC (Doncaster Royal Infirmary - DRI), and a district general hospital in the same area whose PCT did not provide choice at that time and who therefore did not send patients to the ISTC (Bassetlaw District General Hospital - BDGH). We found a statistically significant difference in the number of co-morbidities per patient at the ISTC compared with the DRI (1.23 vs. 2.05) and the ISTC compared with the BDGH (1.23 vs. 1.76). We were unable to show a statistically significant difference between the DRI and the BDGH. We conclude that cherry-picking does take place, and further work should be done to assess the impact on training and finance.