Which statement is true regarding IKDC 2000 MDC values across PFPS and ACL?

Which statement is true regarding IKDC 2000 MDC values across PFPS and ACL?

• A. PFPS MDC is higher than ACL MDC
• B. ACL MDC is higher than PFPS MDC
• C. They are equal
• D. MDCs cannot be compared

Answer: (B)

MDC is the smallest change in a score that exceeds measurement error for that instrument in a specific group. For IKDC 2000, the MDC will differ between PFPS and ACL because of how much scores vary and how consistent the measurements are within each group. ACL injuries tend to show a wider spread in function and more fluctuation in symptoms among individuals, which increases measurement error and the SEM. That higher variability means a larger change is needed to be sure a real difference has occurred, so the MDC will be higher. PFPS generally produces more consistent scores with less fluctuation, leading to a smaller MDC. Therefore, the IKDC 2000 MDC is higher for ACL compared with PFPS, meaning a bigger change is required to be confident it’s not just noise.

MDC is the smallest change in a score that exceeds measurement error for that instrument in a specific group. For IKDC 2000, the MDC will differ between PFPS and ACL because of how much scores vary and how consistent the measurements are within each group. ACL injuries tend to show a wider spread in function and more fluctuation in symptoms among individuals, which increases measurement error and the SEM. That higher variability means a larger change is needed to be sure a real difference has occurred, so the MDC will be higher. PFPS generally produces more consistent scores with less fluctuation, leading to a smaller MDC. Therefore, the IKDC 2000 MDC is higher for ACL compared with PFPS, meaning a bigger change is required to be confident it’s not just noise.