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  • Title: Test-retest reliability and minimum detectable change for various frontal plane projection angles during dynamic tasks.
    Author: Werner DM, Di Stasi S, Lewis CL, Barrios JA.
    Journal: Phys Ther Sport; 2019 Nov; 40():169-176. PubMed ID: 31574410.
    Abstract:
    OBJECTIVE: Establish between-day test-retest reliability metrics for 2-dimensional frontal plane projection angles (FPPAs) during the lateral step-down (LSD), single-limb squat (SLS), single-limb landing (SLL), and drop vertical jump (DVJ). DESIGN: Test-retest reliability study. SETTING: University laboratory. PARTICIPANTS: 20 healthy adults (12 female, age = 23.60 ± 1.93 years old, body mass index = 24.26 ± 2.54 kg/m2) were tested on 2 separate occasions 7-14 days apart. MAIN OUTCOME MEASURES: Intraclass correlation coefficients (ICC), standard errors of the measurement (SEM), and minimal detectable change (MDC) values across the LSD, SLS, SLL, and DVJ for the following body region variables: trunk, trunk on pelvis, pelvis, hip, thigh to vertical, knee, and shank to vertical. RESULTS: There was moderate-to-substantial between-day test-retest reliability for nearly all body regions across all tasks (ICC = 0.65-0.96). SEM values varied across body regions and tasks (0.9-3.5°). MDCs were variable (2.3-9.8°). Of the body regions, MDCs were largest for the knee and hip. By task, MDCs were lowest for the LSD. CONCLUSIONS: This study identified between-day test-retest reliability metrics for 2-dimensional FPPAs across a variety of body regions during commonly assessed clinical tasks. These data allow clinicians and researchers to more confidently assess true change between assessments or over time.
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