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The influence of a knee osteoarthritis diagnosis on people’s beliefs about the condition

Effects of a radiographic diagnosis and explanation of knee osteoarthritis on consumer beliefs about knee pain management: an online randomised controlled trial in adults aged 45 and over who have and have not experienced activity-related knee joint pain

Status
Completed
Phases
Unknown
Study type
Interventional
Source
ANZCTR
Registry ID
ACTRN12624000622505
Enrollment
618
Registered
2024-05-14
Start date
2024-05-16
Completion date
2024-05-25
Last updated
2025-09-08

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

None listed

Brief summary

Unfortunately, many people will experience knee osteoarthritis at some point in their life. This can be diagnosed by a General Practitioner (GP) or other health professional, and there are different ways this may be done. People often have beliefs about treatments for, and the prognosis of, their knee osteoarthritis. Currently, we do not know whether the way someone is diagnosed with knee osteoarthritis makes any difference to their beliefs about treatment or prognosis. This study is interested in learning more about whether the way people are diagnosed with knee osteoarthrtitis changes their beliefs about the condition. We hypothesise that a diagnosis and explanation without x-ray will reduce beliefs that surgery is necessary and increase beliefs that exercise is helpful, compared to a diagnosis and explanation based on x-ray.

Interventions

The entire trial will be administered in one single online survey. Eligible participants will be asked to imagine a hypothetical scenario where they have made an appointment with a General Practitioner (GP) to find out what is wrong with their painful knee. Participants will then be automatically randomised into one of three groups, all of which will be asked to watch a pre-recorded video on their screen where they receive a hypothetical knee osteoarthritis (OA) diagnosis from their GP. The th

The entire trial will be administered in one single online survey. Eligible participants will be asked to imagine a hypothetical scenario where they have made an appointment with a General Practitioner (GP) to find out what is wrong with their painful knee. Participants will then be automatically randomised into one of three groups, all of which will be asked to watch a pre-recorded video on their screen where they receive a hypothetical knee osteoarthritis (OA) diagnosis from their GP. The three groups will be: i) Clinical diagnosis and explanation without being sent for x-ray: the video will show the GP providing a clinical diagnosis of knee OA based on their age and symptoms, including an explanation of why x-rays are not necessary for OA diagnosis. The GP will then explain what OA is. This will include the how it is diagnosed, basic pathogenesis, natural history and treatment options. ii) Diagnosis and explanation based on x-ray findings (but without showing the x-ray images): the video will show the GP ordering an x-ray for the participant, summarising the x-ray report (but not showing the participant the x-ray images), and providing a diagnosis of knee OA. The GP will then explain what OA is. This will include the how it is diagnosed, basic pathogenesis, natural history and treatment options. iii) Diagnosis and explanation based on x-ray (and showing the x-ray images): the video will show the GP ordering an x-ray for the participant, then summarising the x-ray report and Showing them the x-ray images, and providing a diagnosis of knee OA. The GP will then explain what OA is. This will include the how it is diagnosed, basic pathogenesis, natural history and treatment options. The video for all groups will be scripted in a way that intends to reflect what typical language and communication style may look like in a real-world general practice setting. The video in each group is anticipated to last for 2-3 minutes. With regards to fidelity, we will collect data on whether watched allocated video or not time spent watching video.

Sponsors

The University of Melbourne
Lead SponsorUniversity

Study design

Allocation
Randomised controlled trial
Intervention model
Parallel
Primary purpose
Diagnosis

Eligibility

Sex/Gender
All
Age
45 Years to No maximum
Healthy volunteers
Yes

Inclusion criteria

Participants will be eligible for the study if they meet the following inclusion criteria: i) Adults aged 45 years or over; ii) Currently living in Australia; iii) Either have, and have not, experienced activity-related knee joint pain in the last 3 months; and iv) Have never consulted a healthcare professional for chronic knee pain. Note: We will recruit a sample of 50% who have knee pain, and 50% who do not have knee pain.

Exclusion criteria

Inability to understand or read English

Outcome results

None listed

Source: ANZCTR · Data processed: Feb 4, 2026