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The investigators have created an interactive knee osteoarthritis (OA) risk calculator that estimates a user's risk of developing symptomatic knee OA as well as the user's risk for undergoing a total knee replacement (TKR) within their lifetime. To test the impact of the calculator, the investigators recruited OA-free subjects from Amazon's Mechanical Turk. Participants were randomized to either access general information about OA or use the risk calculator in addition to accessing general OA information. The investigators hypothesized that participants randomized to the risk calculator arm would have more accurate perception of their knee OA risk and would have increased willingness to change risky behavior compared to the general OA information group.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Generic Osteoarthritis Risk Information | Sham Comparator | Participants in this arm received generic osteoarthritis information that was not personalized. |
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| Personalized Osteoarthritis Risk | Experimental | Participants in this arm obtained their personalized osteoarthritis risk from the internet-based Osteoarthritis Risk Calculator. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Internet-Based Osteoarthritis Risk Calculator | Behavioral | The investigators have developed a personalized risk calculator for knee osteoarthritis. This risk calculator uses the Osteoarthritis Policy Model to estimate an individual's risk of developing knee osteoarthritis within their lifetime based on demographic information and risk factors. It shows this information to the user with interactive graphs and compares their risk to the risk of an average American of the same age. |
| Measure | Description | Time Frame |
|---|---|---|
| Change in estimated lifetime knee OA risk | The difference between average lifetime knee osteoarthritis risk estimated by participants at baseline and average lifetime knee osteoarthritis risk estimated by participants after the intervention. | 1 day |
| Change in estimated 10-year knee OA risk | The difference between average 10-year knee osteoarthritis risk estimated by participants at baseline and average 10-year knee osteoarthritis risk estimated by participants after the intervention. | 1 day |
| Measure | Description | Time Frame |
|---|---|---|
| Reaching an Action Stage on Diet Contemplation Ladder | The percentage of subjects who originally ranked themselves below an action stage (8 or higher) on a contemplation ladder for changing diet related behaviors and who moved to an action stage after the intervention. | 1 day |
| Reaching an Action Stage on Exercise Contemplation Ladder |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Elena Losina, PHD | Brigham and Women's Hospital | Principal Investigator |
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| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 26494421 | Background | Losina E, Klara K, Michl GL, Collins JE, Katz JN. Development and feasibility of a personalized, interactive risk calculator for knee osteoarthritis. BMC Musculoskelet Disord. 2015 Oct 22;16:312. doi: 10.1186/s12891-015-0771-3. | |
| 26555504 | Background | Michl GL, Katz JN, Losina E. Risk and risk perception of knee osteoarthritis in the US: a population-based study. Osteoarthritis Cartilage. 2016 Apr;24(4):593-6. doi: 10.1016/j.joca.2015.11.001. Epub 2015 Nov 7. |
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| ID | Term |
|---|---|
| D020370 | Osteoarthritis, Knee |
| ID | Term |
|---|---|
| D010003 | Osteoarthritis |
| D001168 | Arthritis |
| D007592 | Joint Diseases |
| D009140 | Musculoskeletal Diseases |
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|
| Generic osteoarthritis information | Behavioral | Subjects viewed generic (i.e. not personalized) information about osteoarthritis risk factors |
|
The percentage of subjects who originally ranked themselves below an action stage (8 or higher) on a contemplation ladder for changing exercise related behaviors and who moved to an action stage after the intervention. |
| 1 day |
| Reaching an Action Stage on Weight Control Contemplation Ladder | The percentage of subjects who originally ranked themselves below an action stage (8 or higher) on a contemplation ladder for changing weight control behaviors and who moved to an action stage after the intervention. | 1 day |
| 27788299 | Derived | Losina E, Michl GL, Smith KC, Katz JN. Randomized Controlled Trial of an Educational Intervention Using an Online Risk Calculator for Knee Osteoarthritis: Effect on Risk Perception. Arthritis Care Res (Hoboken). 2017 Aug;69(8):1164-1170. doi: 10.1002/acr.23136. Epub 2017 Jul 10. |
| D012216 |
| Rheumatic Diseases |