Developing Linkages Between PROMIS Physical Function CAT and QuickDASH Scores in Hand Surgery: A Crosswalk Study.

BACKGROUND

There is no standardization within hand and upper-extremity surgery regarding which patient-reported outcome measures (PROMs) are collected and reported. This limits the ability to compare or combine cohorts that utilize different PROMs. The aim of this study was to develop a linkage model for the QuickDASH (shortened version of the Disabilities of the Arm, Shoulder and Hand) and PROMIS PF CAT (Patient-Reported Outcomes Measurement Information System Physical Function computerized adaptive testing) instruments to allow interconversion between these PROMs in a hand surgery population.

METHODS

A retrospective review was conducted to identify adults (≥18 years old) who had completed the QuickDASH and PROMIS PF CAT instruments at the same clinical encounter. Patients with shoulder pathology were excluded. The linear relationship between scores was evaluated with use of the Pearson correlation coefficient. Linking was performed with use of several common methods, and an optimal linkage model was recommended on the basis of a higher R 2 , strong intraclass correlation coefficient (ICC), and lower standard error (SE). The recommended model was further evaluated in subgroups based on age (<60 or ≥60 years), sex, etiology for presentation (traumatic versus atraumatic), and treatment type (operative versus nonoperative).

RESULTS

A total of 15,019 patients (mean age, 49 years; 54% female; 86% White) were included. The mean QuickDASH score (and standard deviation) was 37 ± 22, and the mean PROMIS PF CAT score was 45 ± 10. There was a strong negative linear relationship between the QuickDASH and PROMIS PF CAT (r = -0.73). The circle-arc linkage model demonstrated good accuracy and reliability (R 2 = 0.55; ICC = 0.71), and crosswalk tables were developed from this model. The subgroup analysis demonstrated age-related bias in the linkage model (root expected mean squared difference, 0.12). To address this, a separate crosswalk table was developed, which was dichotomized by age category.

CONCLUSIONS

The QuickDASH and PROMIS PF CAT scores were successfully linked. Utilization of the developed crosswalks-one specific to patients <60 years old and another specific to patients ≥60 years old-will allow for score interconversion in future meta-analyses and multicenter hand surgery studies.

LEVEL OF EVIDENCE

Prognostic Level III . See Instructions for Authors for a complete description of levels of evidence.