Table I.

Survey questions for patient-reported outcome measures collected as decided by the international expert panel.

Question	Answers/Options
Pain Questions
Affected Joint Pain Patients were asked pre- and postoperatively: On a scale of 0 to 10. 0 being no pain at all. 10 being the worst pain imaginable. Please use the slider to indicate your average pain over the last 7 days in your [left/right] [hip/knee] which [will be/was] operated on.	See Figure 1.
Lower Back Pain Patients were asked pre- and postoperatively: On a scale of 0 to 10. 0 being no pain at all. 10 being the worst pain imaginable. Please use the slider to indicate the average pain over the last 7 days in your lower back.	See Figure 1.
Satisfaction Questions
Patients were asked postoperatively: Please select ONE box which best describes how satisfied you are with the results of your [left/right] [hip/knee] arthroplasty?	Very dissatisfied Dissatisfied Neutral Satisfied Very satisfied
Joint Improvement Questions
Patients were asked postoperatively: Please select ONE box which describes overall, how the problems are now with your [hip/knee] on which you had surgery, compared to before you had your operation?	Much better A little better About the same A little worse Much worse
Expectation Questions – All Joints
Pain Expectation Patients were asked preoperatively: On a scale of 0 to 10. 0 being no pain at all. 10 being the worst pain imaginable. Please use the slider to indicate what you expect your average pain to be in 6 months’ time in your [left/right] [hip/knee] which will be operated on. Patients were asked postoperatively: On a scale of 0 to 10. 0 being no pain at all. 10 being the worst pain imaginable. Please use the slider to indicate your average pain over the last 7 days in your [left/right] [hip/knee] which was operated on.	See Figure 1.
Mobility Expectation Patients were asked preoperatively: Please select ONE box that best describes how you think your mobility will be in 6 months’ time. Patients were asked postoperatively: Please select ONE box that best describes your health TODAY.	Preoperative options: I will have no problems with walking around I will have slight problems with walking around I will have moderate problems with walking around I will have severe problems with walking around I will be unable to walk around Postoperative options: I have no problems with walking around I have slight problems with walking around I have moderate problems with walking around I am unable to walk around
Health expectation Patients were asked preoperatively: We would like to know how good or bad you expect your health to be in 6 months’ time. This scale is numbered from 0 to 100. 100 means the best health you can imagine. 0 means the worst health you can imagine. Please use the slider to indicate how you think your health will be in 6 months’ time. Patients were asked postoperatively (EQ-VAS): This scale is numbered from 0 to 100. 100 means the best health you can imagine. 0 means the worst health you can imagine. Please use the slider to indicate how your health is TODAY.	See Figure 2.

EQ-VAS, EuroQol visual analogue scale.