Publication, Part of Patient Reported Outcome Measures (PROMs)
Finalised Patient Reported Outcome Measures (PROMs) in England, for Hip and Knee Replacement Procedures (April 2020 to March 2021)
Official statistics
Health Gain for Knee Replacements
Total Knee Replacements
For knee replacements, the percentage of patients reporting an improvement in health has increased for all questionnaires since 2009-10. The EQ VAS has shown the highest increase, from 50.2% in 2009-10 to 58.6% in 2020-21. The percentage reporting an improvement is similar to last year (59.5% in 2019-20).
Average Health Gain for Total Knee Replacements
The average health gains for knee replacement patients has also increased since 2009-10:
Measure |
2009-10 |
2019-20 |
2020-21 |
Oxford Knee Score |
14.6 |
17.1 |
16.8 |
EQ-5D Index |
0.292 |
0.329 |
0.317 |
EQ VAS |
3.0 |
7.7 |
7.2 |
The average health gains for Oxford Knee Score, EQ-5D Index and EQ VAS have decreased from last year.
Primary and Revision Knee Replacements
As with hip replacements, if the questionnaire has linked to an episode from the Hospital Episode Statistics data set then we are able to classify the procedure as a primary or revision knee replacement. The highest percentage of patient reporting improvement for primary procedures occurred for the Oxford Knee Score (94.4%). There is a small decrease compared to last year (94.3% in 2019-20). For revision procedures, 90.2% of patients reported an improvement in health. This is an increase compared to last year (88.1% in 2019-20).
Average Health Gain for Primary and Revision Procedures
The table below shows the average health gain for primary and revision knee replacements.
Measure |
Primary |
Revision |
Oxford Knee Score |
16.9 |
13.6 |
EQ-5D Index |
0.315 |
0.305 |
EQ VAS |
7.4 |
4.3 |
When comparing to last year, the average health gains are almost the same for Oxford Knee Score (17.5 for primary and 13.7 for revision in 2019-20). The EQ-5D Index is also very similar to 2019-20 (0.333 for primary and 0.289 for revision). The EQ VAS has shown a slight decrease from last year (7.8 for primary and 5.1 for revision).
Sector Analysis
The national PROMs programme collects data for NHS funded activity only, however patients can be treated at either NHS or independent sector organisations. This may be due to patient choice or subcontracting arrangements between organisations.
The proportion of providers with a reported organisational average health gain above the national average is higher for independent providers than providers in the NHS for primary knee replacement procedures.
58.0% of independent organisations were above the national average compared to 39.5% of NHS organisations. Independent organisations account for 47.5% of all organisations with 30 or more modelled records.
Last edited: 3 August 2023 3:30 pm