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. 2020 Jun 23;296(3):584–593. doi: 10.1148/radiol.2020192091

Figure 1:

Flowchart for case-control matching method. Solid arrows represent patients included in our case-control cohort, whereas dashed arrows and circular nodes represent patients excluded from our case-control cohort. One-to-one case-control matching uses a combination of propensity score and exact matching on the baseline clinical variables of age, body mass index, sex, and ethnicity to create the final cohort. KR = knee replacement, OAI = Osteoarthritis Initiative, PKR = partial knee replacement, TKR = total knee replacement.

Flowchart for case-control matching method. Solid arrows represent patients included in our case-control cohort, whereas dashed arrows and circular nodes represent patients excluded from our case-control cohort. One-to-one case-control matching uses a combination of propensity score and exact matching on the baseline clinical variables of age, body mass index, sex, and ethnicity to create the final cohort. KR = knee replacement, OAI = Osteoarthritis Initiative, PKR = partial knee replacement, TKR = total knee replacement.