Development of an Outcome Score for Patients With Knee Osteoarthritis and Knee Joint Endoprosthesis Using an App

"Our app collects patient-authorized mobility data that are already stored on the patient's smartphone and those that will be recorded in the future, and analyzes these data with respect to their temporal patterns. Each study participant can decide individually which data they wish to share.~In addition, participants are prompted at regular intervals to perform and document functional tests, such as gait assessments (once per month) and knee function tests (weekly).~Furthermore, subjective health data are regularly collected using standardized PROMs: KOOS and SF-36 every three weeks, patient-reported satisfaction with health status on a monthly basis, and user satisfaction with the app every three months.~The collected data can be accessed both by the patient and the study team and can be downloaded and stored as a PDF file if needed.~Participation in the study requires a single on-site visit at the Department and Outpatient Clinic of Orthopedics and Sports Orthopedics. No further in-pe"