Abstract
The authors regret that there are errors in Table 3, which appears on page 2880 of their article. The authors would like to apologise for any inconvenience caused and provide the corrected Table below. Table 3Limits of Goniometer Measurements of Knee Motion and Their Respective Sensitivities and Specificities for Detecting Problematic Knee Motion Using Different Thresholds (Cutoff Values) in Copenhagen Knee ROM Scale (CKRS).Limits of Knee MotionLimit of Knee MotionCKRS Threshold (Between Pictures No.)Sensitivity (%)Specificity (%)Positive Predictive Value (%) (Population Specific)Negative Predictive Value (%) (Population Specific)Flexion < 90°2-3319867903-4468735924-5927233985-61004020100Flexion < 100°2-327100100833-4559471884-5958158985-61004534100Flexion < 110°2-319100100723-4479788804-5888878945-697504897Flexion < 120°4-5659694725-690637286Extension ≥ 15°2-3579236973-41006618100Extension ≥ 10°2-3509882903-4787036934-51002623100Extension ≥ 5°2-322100100573-4577872664-590315576Guide to interpretation of values:Sensitivity: The chance that a patient with a knee motion worse than the specified limit is identified as having a knee motion problem using this Copenhagen Knee ROM Scale (CKRS) threshold.Specificity: The chance that a patient with better knee motion than the specified limit is identified as having acceptable knee motion using this CKRS threshold.Positive predictive value: The chance that a patient reporting knee motion worse than the specified CKRS threshold does have a knee motion worse than the specified limit. (Note that this value is population specific).Negative predictive value: The chance that a patient reporting better knee motion than the specified CKRS threshold does have a knee motion better than the specified limit. (Note that this value is population specific).Negative and positive predictive values in the test population are listed. Authors find the numbers in bold to be of largest clinical relevance. Open table in a new tab Guide to interpretation of values: Sensitivity: The chance that a patient with a knee motion worse than the specified limit is identified as having a knee motion problem using this Copenhagen Knee ROM Scale (CKRS) threshold. Specificity: The chance that a patient with better knee motion than the specified limit is identified as having acceptable knee motion using this CKRS threshold. Positive predictive value: The chance that a patient reporting knee motion worse than the specified CKRS threshold does have a knee motion worse than the specified limit. (Note that this value is population specific). Negative predictive value: The chance that a patient reporting better knee motion than the specified CKRS threshold does have a knee motion better than the specified limit. (Note that this value is population specific). Negative and positive predictive values in the test population are listed. Authors find the numbers in bold to be of largest clinical relevance. Knee Osteoarthritis Patients Can Provide Useful Estimates of Passive Knee Range of Motion: Development and Validation of the Copenhagen Knee ROM ScaleThe Journal of ArthroplastyVol. 33Issue 9PreviewKnee arthroplasty does not always require extensive long-term follow-up. If knee range of motion (ROM) could be assessed reliably by patients, some follow-up visits might be replaced by patient-reported outcome measures, and this additional information could be reported directly to registers. We developed and tested the validity and reliability of a simple scale for patients to self-report their passive knee ROM. Full-Text PDF
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