Symmetry Function: The Differences between Active and Non-Active Above-the-Knee Amputees.

Area of Science:

• Biomechanics
• Rehabilitation Science
• Orthopedics

Background:

• Unilateral above-knee amputation (AKA) affects gait symmetry and physical activity levels.
• Post-rehabilitation, many patients with musculoskeletal disabilities do not meet physical activity criteria.
• Chronic pain is a common issue for individuals with AKA.

Purpose of the Study:

• To investigate gait symmetry in active (AC) versus non-active (NAC) individuals post-unilateral AKA.
• To analyze the relationship between activity level and gait asymmetry using symmetry function (SF).

Main Methods:

• Study included 14 participants (11 men, 3 women) with unilateral AKA, divided into AC and NAC groups.
• Gait analysis was performed using the BTS Smart-E system in a Biomechanical Analysis Laboratory.
• Measurements included time series assessment of pelvic and lower limb joint motion, and ground reaction forces (GRF) to calculate SF.

Main Results:

• Both AC and NAC groups exhibited asymmetrical gait patterns, but with varying magnitudes and timing.
• Statistically significant differences (p < 0.05) in SF were observed between the groups.
• The AC group showed a more symmetrical gait (SF: -25% to 24%) compared to the NAC group (SF: 43% to 77%, average 59%).

Conclusions:

• Activity level significantly impacts gait symmetry in individuals with unilateral AKA.
• Active individuals demonstrate more symmetrical pelvic and hip joint motion during gait.
• Promoting physical activity may be crucial for improving gait biomechanics and potentially reducing chronic pain in AKA patients.