[How reliable are data from 3d-gait analysis]

Area of Science:

• Biomechanics
• Movement Science
• Clinical Measurement

Background:

• Three-dimensional computerized gait analysis is a sophisticated tool for evaluating human locomotion.
• Assessing the reliability of such systems is crucial for their clinical application.
• Previous studies have explored gait analysis, but test-retest reliability needs further investigation.

Purpose of the Study:

• To determine the test-retest reliability of 3-dimensional computerized gait analysis in healthy subjects.
• To provide preliminary data on the consistency of gait measurements.
• To establish the validity of this method for clinical use.

Main Methods:

• Ten healthy participants underwent two gait analysis trials within a 2-hour period.
• A 3-dimensional computerized gait analysis system (VICON 512) collected kinetic, kinematic, and time-distance data.
• Markers were reapplied between trials, and Pearson's correlation coefficients were calculated.

Main Results:

• Excellent reliability (r = 0.86-0.99) was observed for time-distance and sagittal plane kinematics.
• High reliability (r = 0.90-0.98) was found for power parameters.
• Lower reliability (r = 0.59-0.89) was noted for frontal and transverse plane kinematics, with the hip joint's transverse plane measures showing the poorest reliability.

Conclusions:

• Three-dimensional computerized gait analysis exhibits excellent test-retest reliability, especially for sagittal plane measures.
• The findings support the use of this method for analyzing and evaluating outcomes in movement disorders.
• This technology is a valuable tool for both conservative and operative treatment assessments.