Hip adduction angle during wider step-width gait affects hip adduction moment impulse

Area of Science:

• Biomechanics
• Orthopedics
• Gait Analysis

Background:

• Hip osteoarthritis (OA) progression is linked to increased external hip adduction moment (HAM) impulse during stance.
• Hip adduction angle (HAA) influences HAM impulse during walking.
• Wider step-width (WS) gait is a known modification to decrease peak HAM, but its effect on HAM impulse and HAA is not well-documented.

Purpose of the Study:

• To investigate if the hip adduction angle (HAA) influences the peak hip adduction moment (HAM) and HAM impulse during wider step-width (WS) gait.
• To determine the relationship between HAA and the effectiveness of WS gait in reducing HAM impulse.

Main Methods:

• Twenty-six healthy young adults walked with normal step-width (NS) and WS gait.
• 3D motion capture system evaluated peak HAM, HAM impulse, HAA, and other gait parameters.
• Participants were grouped based on HAA size during WS gait for comparative analysis.

Main Results:

• Participants with a smaller HAA exhibited a significantly greater percentage reduction in HAM impulse (14.5%) during WS gait compared to those with a larger HAA (1.6%).
• No significant differences in other gait parameters were observed between the groups.
• The large HAA group demonstrated a larger HAA during normal step-width gait compared to the small HAA group.

Conclusions:

• Smaller hip adduction angles (HAA) are associated with more effective reduction of hip adduction moment (HAM) impulse during wider step-width (WS) gait.
• HAA plays a significant role in the efficacy of WS gait for reducing HAM impulse.
• Clinical recommendations for WS gait interventions should consider the individual's HAA to maximize benefits for hip osteoarthritis prevention.