Faculty Collaboration Database

Principal component based analysis of biomechanical inter-trial variability in individuals with chronic ankle instability. Clin Biomech (Bristol, Avon) 2012 Aug;27(7):706-10

Date

03/20/2012

Pubmed ID

22424780

DOI

10.1016/j.clinbiomech.2012.02.005

Scopus ID

2-s2.0-84863614451 (requires institutional sign-in at Scopus site)   30 Citations

Abstract

BACKGROUND: Biomechanical variability during movement may influence joint stability in individuals with chronic ankle instability (CAI). The purpose of this study was to compare the kinematic and the kinetic inter-trial variability between healthy and CAI individuals.

METHODS: Eleven individuals with CAI and 11 matched controls performed five repetitions of a single-leg landing task. Biomechanical data were collected from 100 ms before to 200 ms after touchdown, and were used to calculate touchdown angles, peak angles and moments at the ankle joint in the frontal and sagittal planes. In addition, principal component analyses were used to quantify kinematic and kinetic patterns in the same planes across the 300 ms time window. Five trial averages and inter-trial variability were calculated for all variables for each subject. Independent t-tests were used to compare variables between groups.

FINDINGS: The CAI group displayed greater inter-trial variability for principal component scores in the sagittal and frontal planes. The sagittal plane principal component captured a phase shift in plantar-flexion motion before touchdown, while the frontal plane principal component captured the general magnitude of motion during the entire movement. The CAI group therefore exhibited greater inter-trial variability in the sagittal plane before touchdown and in the frontal plane during the entire movement.

INTERPRETATION: While average motions did not differ between groups, the CAI group displayed greater kinematic inter-trial variability when analyzed with the principal component analysis. More variable joint motions may indicate less dynamic stability in the CAI group, which may originate from greater ligamentous laxity or diminished neuromotor control.

Author List

Kipp K, Palmieri-Smith RM

Author

Kristof Kipp BS,MS,PhD Assistant Professor in the Physical Therapy department at Marquette University

MESH terms used to index this publication - Major topics in bold

Ankle Joint
Chronic Disease
Computer Simulation
Female
Humans
Joint Instability
Male
Models, Biological
Models, Statistical
Postural Balance
Posture
Principal Component Analysis
Range of Motion, Articular
Reproducibility of Results
Sensitivity and Specificity
Sprains and Strains
Young Adult