The purpose of The Improve Osteoarthritis Care study is to improve the quality of osteoarthritis care in Norwegian primary care, by increasing the use of recommended treatment modalities and improving patient access to recommended treatments. The study will use tailored implementation strategies, targeting primary care physicians and physiotherapists to improve knowledge and addressing individual barriers to providing recommended treatments.

Previous research has shown that current osteoarthritis care for persons with hip or knee osteoarthritis (OA) in Norway has a potential for improvement as the provided care may not necessarily reflect evidence-based guideline recommendations. The overall purpose of the "Improve Osteoarthritis Care" study is that people with symptomatic hip and knee OA should receive care in line with current recommendations. To achieve this goal, tailored implementation strategies will be applied in order to: 1) Improve the quality of care offered to people with symptomatic hip and knee OA, 2) increase knowledge of recommended OA care among people with hip and knee OA, 3) Increase the number of primary care physiotherapists' offering group-based patient-education and structured exercise as part of their routine clinical practice, 4) Increase the number of general practitioners who have received a summary of the OA treatment recommendations.

To evaluate the effect of the tailored implementation strategy a pre-post design will be applied, and members of the Norwegian Rheumatology Association with self-reported hip or knee OA will be asked to evaluate quality of OA care at the two timepoints.

Inclusion Criteria:

• Self-reported hip or knee osteoarthritis

Exclusion Criteria:

• Persons who do not understand the Norwegian language