How many knee ops have you had to re-do?

ASK your surgeon about his or her revision rate (where a failed implant needs replacing). You can also check The National Joint Registry, which has information on over two million joint replacement operations in England, Wales and Northern Ireland since 2002. This includes more than 2,000 individual surgeons’ results and how they compare with the national average. It also provides data on the number of knee replacements, revisions and mortality rates by hospital. If yours has a higher-than-expected revision rate, ask why. Rather than a red flag, it could mean they’re specialists in salvaging knees when surgery has gone wrong (and such surgeons are very well-placed to avoid such mistakes themselves). See njrsurgeon hospitalprofile.org.uk and njrcentre.org.uk