Prosthetic Gait Mechanics in Lower Limb Amputation

Prosthetic gait mechanics following lower limb amputation encompass the interplay between artificial limb components, residual limb physiology and neuromuscular control to restore ambulatory function. Amputation disrupts the continuous kinetic chain of the lower extremity, leading to alterations in joint kinematics, muscle activation patterns and load distribution across the prosthetic socket and intact limbs. Key adaptations include modified stance and swing phase durations, asymmetrical ground reaction forces and compensatory hip and trunk motions to maintain balance and forward propulsion. Energy storage and return mechanisms within modern prosthetic feet aim to replicate the elastic behaviour of biological tendons, returning mechanical energy during late stance to reduce metabolic cost and redistribute loading. Integration of sensor technologies has advanced real-time analysis of gait parameters, informing individual alignment and training protocols. Understanding these mechanics is critical for optimising device design, rehabilitation strategies and long-term musculoskeletal health in amputee populations across varied terrains and activity levels.

Research from Nature Portfolio

Recent studies have characterised how enhancements in prosthetic foot energy return influence whole-body propulsion. A comparative investigation of a novel linkage-based prosthetic foot versus a traditional energy-storage-and-return foot demonstrated that increased mechanical energy release during late stance elevates centre of mass propulsion without exacerbating collision forces on the intact limb. This work showed that greater prosthetic energy return correlates with reduced loading on the sound side, indicating a more symmetrical gait and potential mitigation of overuse injuries. The findings support the design of feet that not only conserve energy but actively contribute to propulsion across level and inclined walking, thereby improving functional mobility and comfort for unilateral transtibial amputees.

Prosthetic Gait Mechanics in Lower Limb Amputation publication trend

The graph below shows the total number of articles in prosthetic gait mechanics in lower limb amputation across all publications each year (not limited to Nature Index journals).

Technical terms

Energy storage and return: A prosthetic foot mechanism that stores elastic energy during early stance and releases it during late stance to aid propulsion.

Continuous relative phase (CRP): A measure of the temporal coordination between two limb segments during gait, reflecting phase relationships in joint motion.

Ground reaction force (GRF): The force exerted by the ground on the foot during stance, used to assess load distribution and symmetry.

Centre of mass (CoM) energy change: The work done to raise and propel the body’s mass centre during walking, indicative of overall gait efficiency.

Inertial measurement unit (IMU): A wearable sensor combining accelerometers and gyroscopes to track orientation and motion of body segments in real time.

References

1. Increasing prosthetic foot energy return affects whole-body mechanics during walking on level ground and slopes. Scientific Reports (2018).
2. Coordination of Lower Limb During Gait in Individuals With Unilateral Transfemoral Amputation. IEEE Transactions on Neural Systems and Rehabilitation Engineering (2023).
3. Inertial Measuring System to Evaluate Gait Parameters and Dynamic Alignments for Lower-Limb Amputation Subjects. Sensors (2024).
4. Ground reaction forces during double limb stances while walking in individuals with unilateral transfemoral amputation. Frontiers in Bioengineering and Biotechnology (2023).