ABSTRACT: OBJECTIVE:To assess construct validity of the Prosthetic Limb Users Survey of Mobility (PLUS-M), a self-report mobility measure for people with lower limb amputation (LLA). DESIGN:Cross-sectional study. SETTING:Private prosthetic clinics (n=37). PARTICIPANTS:Current lower limb prosthesis users (N=199; mean age ± SD, 55.4±14.3y; 71.4% men) were assessed before receiving a replacement prosthesis, prosthetic socket, and/or prosthetic knee. INTERVENTIONS:Not applicable. MAIN OUTCOME MEASURES:Convergent construct validity was examined using correlations between participants' PLUS-M T-scores and measures of physical function, mobility, and balance, including the Amputee Mobility Predictor (AMP), timed Up and Go (TUG), Patient-Reported Outcomes Measurement Information System-Physical Function (PROMIS-PF), Prosthesis Evaluation Questionnaire-Mobility Subscale (PEQ-MS), and Activities-specific Balance Confidence (ABC) Scale. Known-groups construct validity was evaluated by comparing differences in PLUS-M T-scores among participants grouped by Medicare Functional Classification Level (MFCL). RESULTS:PLUS-M T-scores demonstrated a moderate positive relationship with AMP scores (?=.54, P<.001) and a moderate negative relationship with TUG times (?=-.56, P<.001). The PLUS-M also showed a strong positive relationship with PEQ-MS scores (?=.78, P<.001), ABC Scale scores (?=.81, P<.001), and PROMIS-PF T-scores (?=.81, P<.001). Significant differences (P<.05) in PLUS-M T-scores were found among groups of people classified by different MFCLs. CONCLUSIONS:Study results support the validity of the PLUS-M as a self-report measure of prosthetic mobility. Correlations between PLUS-M and measures of physical function, mobility, and balance indicate convergent construct validity. Similarly, significant differences in PLUS-M T-scores across MFCL groups provide evidence of known-groups construct validity. In summary, evidence indicates that PLUS-M has good construct validity among people with LLA.
