Task-specific differences in lower limb biomechanics during dynamic movements in individuals with chronic ankle...

Area of Science:

• Biomechanics
• Sports Medicine
• Orthopedics

Background:

• Chronic ankle instability (CAI) is linked to lower limb deficits and altered biomechanics during dynamic activities.
• Previous research on CAI biomechanics during various tasks shows conflicting results due to differing methodologies and definitions.

Purpose of the Study:

• To investigate differences in lower extremity biomechanics during walking, running, and jump-landing between individuals with and without CAI.

Main Methods:

• A case-control study compared 17 individuals with CAI to 15 healthy controls.
• Sagittal and frontal plane ankle/hip angles and moments, and mediolateral foot balance (MLFB) were analyzed during walking, running, and jump-landing.
• Statistical parametric mapping (SPM) and discrete variable comparisons were employed.

Main Results:

• No significant biomechanical differences were observed during walking between groups.
• During running, the CAI group displayed reduced plantar flexor moments and greater lateral foot deviation.
• In jump-landing, the CAI group showed increased hip extensor moments and hip adduction angles post-contact.

Conclusions:

• Biomechanical alterations in the ankle and hip are present in individuals with CAI during running and jump-landing, but not walking.
• These findings suggest potential sensorimotor impairments or compensatory strategies in CAI, guiding future rehabilitation strategies.