We started collecting data on PROMs on November 1, 2022. Before elective primary surgery, patients fill out pre-operative Oxford Hip or Knee Score questionnaires and EQ-5D-5L quality of life questionnaire, which are entered into the application. Based on this, a worksheet is created for calling patients and filling in PROMs questionnaires 6 and 12 months after surgery. The preliminary results are in the annual report, a graphic presentation of the collected data is being prepared.