Crosswalks Between Knee and Hip Arthroplasty Short Forms

Abstract

Background: The Oxford Knee Score (OKS); Oxford Hip Score (OHS); Knee injury and Osteoarthritis Outcome Score, Joint Replacement (KOOS JR); and Hip disability and Osteoarthritis Outcome Score, Joint Replacement (HOOS JR) are well-validated and widely used short-form patient-reported outcome measures (PROMs) for assessing outcomes after total knee arthroplasty (TKA) and total hip arthroplasty (THA). We are not aware of the existence of any crosswalks to convert scores between these PROMs. We aimed to develop and validate crosswalks that will permit the comparison of scores between studies using different PROMs and the pooling of results for meta-analyses. Methods: We retrospectively analyzed scores from patients (486 in the knee cohort and 340 in the hip cohort) from the Syracuse Orthopedic Specialists Joint Registry who had completed the appropriate PROMs (OKS and KOOS JR in the knee cohort and OHS and HOOS JR in the hip cohort) as the standard of care before undergoing primary TKA or unicompartmental knee arthroplasty (UKA) between January 9, 2016, and June 19, 2017, or primary THA or hip resurfacing between November 29, 2010, and October 30, 2017, or when returning for postoperative care. Using the equipercentile equating method, we created 4 crosswalks: OKS to KOOS JR, KOOS JR to OKS, OHS to HOOS JR, and HOOS JR to OHS. To assess validity, Spearman coefficients were calculated using bootstrapping methods, and means for actual and crosswalk-derived scores were compared. Results: There were minimal differences between the means of the known and crosswalk-derived scores. As calculated with the use of bootstrapping methods, Spearman coefficients between the actual and derived scores were strong and positive for both knee arthroplasty crosswalks (0.888 to 0.889; 95% confidence interval [CI], 0.887 to 0.891) and hip arthroplasty crosswalks (0.916 to 0.918; 95% CI, 0.914 to 0.919). Conclusions: We successfully created 4 crosswalks that allow conversion of Oxford scores to KOOS and HOOS JR scores and vice versa. These crosswalks will allow harmonization of PROMs assessment regardless of which of the short forms are used, which may facilitate multicenter collaboration or allow sites to switch PROMs without loss of historic comparison data. Level of Evidence: Level III. See Instructions for Authors for a complete description of levels of evidence.

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

“…A few studies have developed crosswalk tables to link various PROMs for orthopaedic patients. [32][33][34][35] In this study, we linked the KOOS-PS instrument with the PROMIS-PF 10a: although the KOOS-PS is a joint-specific measure and the PROMIS-PF 10a is a universal measure, both instruments mainly measure respondents' ability to function in everyday life.…”

Patient Satisfaction, Functional Outcomes, and Implant Survivorship in Patients Undergoing Customized Unicompartmental Knee Arthroplasty

“…Though no previous studies have reported KOOS, JR. scores after UKA, normative data collected for subjects aged 18–64 years with healthy knees show a mean score of 92.3 (SD: 11.7) that decreases with age and female sex to 91.5 (SD: 12.1) in 56–64-year-old males and 86.6 (SD: 14.6) in 56–64-year-old females [ 44 ]. Further reference may be provided by converting KOOS, JR. scores to equivalent Oxford Knee Scores (OKS) [ 45 ] using the PROM crosswalk created by Polascik et al [ 46 ]. In their study, they provided a conversion table and demonstrated similar sample means and distributions between the true and derived PROM scores.…”

Robotic Assistance in Unicompartmental Knee Arthroplasty Results in Superior Early Functional Recovery and Is More Likely to Meet Patient Expectations

“…At 1 year post-op, the average KOOS-JR in the robotic-assisted cohort was 84. Using the crosswalk of KOOS-JR to Oxford Knee Scores (OKS) [38], this corresponds to an OKS of 44. In contrast, less than half of the robotic patients in the Blyth study failed to achieve an OKS of 43.…”