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A dynamical systems approach to lower extremity running injuries.
J Hamill1, R E van Emmerik, B C Heiderscheit
1Biomechanics Laboratory, Department of Exercise Science, University of Massachusetts Amherst, Amherst, MA 01003, USA. jhamill@exsci.umass.edu
Clinical Biomechanics (Bristol, Avon)
|October 16, 1999
Summary
A novel dynamical systems approach reveals that individuals with patellofemoral pain exhibit less variability in lower extremity coupling during locomotion compared to healthy individuals. This finding suggests a functional role for movement variability in running injuries.
Area of Science:
- Biomechanics
- Kinesiology
- Dynamical Systems Theory
Background:
- Traditional analyses of lower extremity coupling often overlook movement variability.
- Understanding movement patterns is crucial for diagnosing and treating musculoskeletal injuries.
Purpose of the Study:
- To introduce and validate a dynamical systems approach for analyzing lower extremity coupling.
- To investigate differences in continuous relative phase and its variability between symptomatic and asymptomatic individuals.
Main Methods:
- Calculating phase angles for segments and joint angles.
- Determining continuous relative phase and its variability using paired segment/joint motions.
- Comparing data from asymptomatic, symptomatic (patellofemoral pain), and non-injured individuals.
Main Results:
- Asymptomatic individuals, regardless of anatomical variations (e.g., Q-angle), showed no significant differences in continuous relative phase or its variability.
- Individuals with patellofemoral pain exhibited significantly less variability in continuous relative phase compared to healthy, non-injured individuals.
- Reduced variability in symptomatic individuals suggests highly repeatable, narrow-range joint actions.
Conclusions:
- The study challenges the traditional view that movement variability solely indicates disordered movement.
- Variability in lower extremity segment coupling during locomotion may serve a functional role.
- The dynamical systems approach shows potential for detecting and treating running injuries, including patellofemoral pain.