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Test-retest reliability and minimum detectable change for various frontal plane projection angles during dynamic

D M Werner1, S Di Stasi2, C L Lewis3

  • 1Department of Physical Therapy, University of Dayton, 300 College Park, USA.

Physical Therapy in Sport : Official Journal of the Association of Chartered Physiotherapists in Sports Medicine
|October 2, 2019
PubMed
Summary
This summary is machine-generated.

This study found moderate-to-substantial reliability for frontal plane projection angles (FPPAs) during common clinical tasks. These metrics help clinicians assess true changes in patient movement over time.

Keywords:
Dynamic valgusHipInjury riskKneeTrunk

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Area of Science:

  • Biomechanics
  • Kinesiology
  • Clinical Assessment

Background:

  • Frontal plane projection angles (FPPAs) are crucial for assessing lower extremity biomechanics.
  • Understanding the reliability of FPPA measurements is essential for clinical decision-making.
  • Previous research has not comprehensively established test-retest reliability for FPPAs across various functional tasks.

Purpose of the Study:

  • To establish between-day test-retest reliability metrics for 2-dimensional FPPAs.
  • To assess reliability across four functional tasks: lateral step-down (LSD), single-limb squat (SLS), single-limb landing (SLL), and drop vertical jump (DVJ).
  • To determine reliability for multiple body regions including the trunk, pelvis, hip, thigh, knee, and shank.

Main Methods:

  • A test-retest reliability study design was employed.
  • Twenty healthy adults participated in the study.
  • Measurements were taken on two separate occasions, 7-14 days apart, in a university laboratory setting.

Main Results:

  • Moderate-to-substantial between-day test-retest reliability (ICC = 0.65-0.96) was observed for most body regions across all tasks.
  • Standard errors of the measurement (SEM) ranged from 0.9-3.5 degrees.
  • Minimal detectable change (MDC) values varied (2.3-9.8 degrees), with the largest MDCs noted for the knee and hip, and the lowest for the LSD task.

Conclusions:

  • Reliable between-day test-retest metrics for 2D FPPAs were established for common clinical tasks.
  • The findings provide valuable data for clinicians and researchers to confidently interpret changes in FPPA measurements.
  • These reliability metrics enhance the ability to detect true changes in biomechanics between assessments or over time.