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Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
Published on: September 18, 2020
Differences in spatiotemporal landing variables during a dynamic stability task in subjects with CAI
1Department of Kinesiology, University of Toledo, Toledo, Ohio 43606, USA. phillip.gribble@utoledo.edu
Scandinavian Journal of Medicine & Science in Sports
|June 16, 2009
Summary
Individuals with chronic ankle instability (CAI) exhibit reduced dynamic stability during jump landings. This diminished stability is linked to decreased knee flexion preparation, highlighting a key factor in CAI.
Area of Science:
- Biomechanics
- Sports Medicine
- Orthopedics
Background:
- Chronic ankle instability (CAI) is linked to dynamic stability deficits and proximal neuromuscular changes.
- The relationship between these factors in CAI remains unclear.
Purpose of the Study:
- To investigate the role of lower extremity kinematics in dynamic stability during jump landings in individuals with CAI.
- To determine how kinematic strategies differ between those with and without CAI.
Main Methods:
- Thirty-eight participants (19 with unilateral CAI, 19 controls) performed single-limb jump landings.
- Kinematic data (ankle, knee, hip flexion) and ground reaction forces were recorded.
- Resultant Vector Time to Stabilization (RVTTS) was calculated to assess dynamic stability.
Main Results:
- The CAI group demonstrated significantly reduced dynamic stability (lower RVTTS).
- Individuals with CAI exhibited significantly less knee flexion pre-impact compared to controls.
- This suggests a preparatory landing strategy difference in the CAI group.
Conclusions:
- Reduced dynamic stability in CAI is associated with altered lower extremity kinematics.
- Less preparatory knee flexion may contribute to diminished dynamic stability in CAI.
- These findings offer insights into the neuromuscular control deficits in CAI.
