Abstract
A cross-sectional analysis of data derived from patients undergoing knee surgery at
a single institution was conducted. The objectives of the study were to (1) compare
how the Patient-Reported Outcomes Measurement Information System physical function
(PROMIS PF) computer adaptive test performs against the International Knee Documentation
Committee (IKDC) Subjective Knee Form in evaluating functional status, and (2) to
determine demographic, clinical, and psychosocial correlates of each outcome measure
in an urban population undergoing a variety of knee surgeries. We hypothesized that
there would be a strong correlation between PROMIS PF and IKDC, with minimal floor
and ceiling effects, and similar clinical correlates. The sample consisted of 412
patients undergoing knee surgery. Bivariate and multivariable statistical analyses
were performed to identify significant independent predictors. The PROMIS PF and IKDC
scores were strongly correlated (r
s = 0.71, p < 0.001), and neither exhibited floor nor ceiling effects. Lower body mass index,
no preoperative opioid use, lower Charlson comorbidity index score, employment, and
lower income were found to be significant independent predictors for better scores
on both PROMIS PF and IKDC. Patients undergoing total knee arthroplasty had significantly
lower PROMIS PF and IKDC scores (p < 0.05). Potential explanations for these findings are presented, and clinical implications
are discussed.
Keywords
knee - surgery - clinical characteristics - physical function - PROMIS - IKDC
