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Related Experiment Video

Updated: May 9, 2025

Isokinetic Robotic Device to Improve Test-Retest and Inter-Rater Reliability for Stretch Reflex Measurements in Stroke Patients with Spasticity
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Test-Retest Reliability and Responsiveness for the Simplified Chinese Lower Extremity Functional Scale in Patients

Yongni Zhang1, Dongmei Ai2, Yuan Gao3

  • 1Duquesne-China Health Institute, Duquesne University, Pittsburgh, Pennsylvania, USA.

Orthopaedic Journal of Sports Medicine
|May 5, 2025
PubMed
Summary
This summary is machine-generated.

The simplified Chinese Lower Extremity Functional Scale (SC-LEFS) shows excellent reliability and responsiveness for nonarthritic lower extremity injuries. A 5.1-point change indicates measurement error, while 9.5 points suggest meaningful improvement in function.

Keywords:
minimal detectable changepatient-reported outcome measurepsychometric propertiessubstantial clinical benefit

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Area of Science:

  • Orthopedics
  • Physical Therapy
  • Rehabilitation Medicine

Background:

  • The simplified Chinese Lower Extremity Functional Scale (SC-LEFS) assesses function in Chinese-speaking patients with lower extremity musculoskeletal disorders.
  • Previous research has not evaluated the SC-LEFS's reliability and responsiveness in nonarthritic musculoskeletal injuries.

Purpose of the Study:

  • To determine the minimal detectable change (MDC) for test-retest reliability of the SC-LEFS.
  • To establish the substantial clinical benefit (SCB) for responsiveness of the SC-LEFS.
  • To evaluate these measures in patients with nonarthritic lower extremity musculoskeletal injuries.

Main Methods:

  • A cohort of 763 patients (aged 18-50) with nonarthritic lower extremity injuries completed the SC-LEFS at baseline and 4 weeks.
  • Test-retest reliability was assessed using the "stable" group (n=40) to calculate MDC.
  • Responsiveness was evaluated by comparing "improved" (n=497) and "not improved" (n=266) groups to determine SCB.

Main Results:

  • Excellent test-retest reliability was found with an intraclass correlation coefficient of 0.98 and an MDC of 5.1 points.
  • The SCB value for responsiveness was determined to be 9.5 points.
  • The SC-LEFS demonstrated good ability to differentiate improved from unimproved patients (AUC=0.75).

Conclusions:

  • The SC-LEFS is reliable and responsive for Chinese-speaking patients with nonarthritic lower extremity musculoskeletal injuries.
  • An MDC of 5.1 points represents measurement error.
  • A 9.5-point improvement on the SC-LEFS signifies a clinically meaningful change over a 4-week period.