Patients undergoing elective inpatient surgery for hip and knee replacement, funded by the English NHS are asked to complete questionnaires before and after their operations to assess improvement in health as perceived by the patients themselves. This publication is for Finalised Patient Reported Outcome Measures (PROMs) in England – April 2024 to March 2025.
Over the past year, we have investigated a variety of challenges with the way the data are processed on complex legacy systems. In January 2026, we proposed that given the processing challenges and relatively low response rates, that the next data, relating to final 2024/25 was released as management information, rather than as an official statistic.
We continue to investigate the issues and have included some information in this report. While this work is underway, we suggest that the findings are treated with caution.
In analysing outcomes driven by the difference in pre-operative and post-operative questionnaires, please note that some data breakdowns or analyses are dependent on questionnaire pairs being linked to operations in Hospital Episode Statistics (HES) while others are not. In addition, the report presents both adjusted and non-adjusted figures and this should be borne in mind when summarising any findings. There may also be some disparities in the way figures are calculated across products.
A small number of independent sector provider site codes use a five-character ‘ANANA’ format. Due to a truncation issue in the PROMs processing system, these codes are shortened to their first three characters in part of the post-processing. As a result, in some CSV products – particularly the Participation and Linkage file and some provider and sub-ICB breakdowns – these sites may appear as ‘unknown’ or may not be labelled correctly. The underlying PROMs records for these patients remain included in the national, sub-ICB and casemix-adjusted figures. The issue only affects how a small number of provider or site rows are labelled in certain CSV outputs.
At the time of publication this affected the following independent sector hospital sites:
Sulis Hospital Bath (Foxcote Avenue) – G3Z1Q
(may appear under truncated codes such as G3Z or B3W)
Nuffield Health Parkside Hospital – R0F4N (appears as R0F)
Nuffield Health at St Bartholomew’s Hospital – U9C3Y (appears as U9C)
Claremont Private Hospital – B3M1X (appears as B3M)
Nuffield Health The Holly Hospital – H4I8B (appears as H4I)
Practice Plus Group Hospital, Birmingham – M2Y6D (appears as M2Y)
Fairfield Independent Hospital – Y9S1N (appears as Y9S)
This report contains data for providers for whom questionnaires are submitted via the supplier Open Medical. Such data may have been excluded from recent reports.
