Format

Send to

Choose Destination
Arch Phys Med Rehabil. 2017 Feb;98(2):277-285. doi: 10.1016/j.apmr.2016.07.026. Epub 2016 Aug 30.

Construct Validity of the Prosthetic Limb Users Survey of Mobility (PLUS-M) in Adults With Lower Limb Amputation.

Author information

1
Department of Rehabilitation Medicine, University of Washington, Seattle, WA. Electronic address: bhafner@uw.edu.
2
Research Department, Miami Veterans Affairs Healthcare System, Miami, FL; Department of Physical Therapy, University of Miami Miller School of Medicine, Coral Gables, FL.
3
Department of Rehabilitation Medicine, University of Washington, Seattle, WA.

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 (ρ=.54, P<.001) and a moderate negative relationship with TUG times (ρ=-.56, P<.001). The PLUS-M also showed a strong positive relationship with PEQ-MS scores (ρ=.78, P<.001), ABC Scale scores (ρ=.81, P<.001), and PROMIS-PF T-scores (ρ=.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.

TRIAL REGISTRATION:

ClinicalTrials.gov NCT01750372.

KEYWORDS:

Amputation; Artificial limbs; Motor activity; Movement; Outcome assessment (health care); Rehabilitation; Self report

PMID:
27590443
PMCID:
PMC5276724
DOI:
10.1016/j.apmr.2016.07.026
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Elsevier Science Icon for PubMed Central
Loading ...
Support Center