Linking the KOOS-PS to PROMIS Physical Function in Knee Patients Evaluated for Surgery

Abstract

Introduction:The Knee Injury and Osteoarthritis Outcome Score-Physical Function Short-form and the Patient-Reported Outcomes Measurement Information System Physical Function are widely used patient-reported outcome measures in orthopaedic practice and research. It would be helpful for clinicians and researchers to compare scores obtained on one instrument with those collected on another. To achieve this goal, this study conducted a linking analysis and computed a crosswalk table between these two scales. Data: The data of this study were collected as part of the clinical care of total knee arthroplasty patients in a large urban and suburban health system. The sample was a mix of responses from nonsurgical (no surgery performed), preoperative (before surgical intervention), and postoperative (after surgical intervention) groups. Methods: This study applied five linking methods: the item response theory (IRT)-based linking methods including fixed-parameter calibration, separate-parameter calibration with Stocking-Lord constants, and calibrated projection; and the equipercentile methods with log-linear smoothing and nonsmoothing approaches. Before conducting the linking analysis, we checked the linking assumptions including the similar content of the two scales, the unidimensionality of the combined scales, and the population invariance. The results of the five linking methods were evaluated by mean difference, SD, root-mean-squared deviation, intraclass correlation coefficient of the observed T scores and the crosswalkderived T scores. Results: The linking assumptions were all met. T scores generated from the Stocking-Lord crosswalk had the smallest mean difference (= 20.03) and relatively small SD (= 4.91) and root-mean-squared deviation (= 4.91) among the five linking methods. We validated this crosswalk in a larger sample with the nonsurgical, preoperative, and postoperative groups and in an external sample.

The current utilization of the patient-reported outcome measurement information system (PROMIS) in isolated or combined total knee arthroplasty populations

“…A crosswalk table to convert KOOS PF SF raw and summary scores to PROMIS PF T -scores was successfully developed and validated by the authors. This study supports integration of the PROMIS PF domain into a clinical and research workflow by providing reliable conversions between PROMIS PF and KOOS PF SF scores [ 21 ].…”

“…Similarly, Tang et al. aimed to investigate whether KOOS PF SF could be linked to PROMIS PF SF scores using five linking approaches [ 21 ]. In this retrospective study, data from 3667 patients who were under consideration for primary TKA was used.…”

Linking Hip Disability and Osteoarthritis Outcome Score-Physical Function Short Form and PROMIS Physical Function

“…These crosswalks add to the literature linking anatomic-specific and generic (eg, PROMIS) measures of health status. [27][28][29] Our findings are strengthened by a large sample of unique patients who each completed both assessments. This single-sample approach allowed us to compare observed and linked scores based on the linking approach to determine accuracy.…”

Challenges and Opportunities for the Use of Patient-Reported Outcome Measures in Orthopaedic Pediatric and Sports Medicine Surgery

“…Importantly, PROMIS has been cross-walked with several established legacy metrics to provide enhanced interpretation and additional clinical data points. 23-26…”

“…Importantly, PROMIS has been cross-walked with several established legacy metrics to provide enhanced interpretation and additional clinical data points. [23][24][25][26] The field of sports medicine has also observed a substantial increase in the psychometric transformation of previously developed PROMs to enhance their clinical prognostic utility and interpretability. Emphasis on quantifying clinically meaningful outcome thresholds for various procedures in the form of the minimal clinically important difference (MCID), patient acceptable symptom state (PASS), and substantial clinical benefit (SCB) present an excellent opportunity for better understanding treatment response.…”