How does external lateral stabilization constrain normal gait, apart from improving medio-lateral gait stability?

Area of Science:

• Biomechanics
• Gait Analysis
• Human Movement Science

Background:

• Previous research on lateral stabilization devices for gait stability has not fully addressed their impact on pelvis rotations.
• Existing devices often restrict not only lateral motion but also transverse and frontal pelvis rotations.

Purpose of the Study:

• To investigate the effects of external lateral stabilization on gait, specifically comparing conditions with and without constrained transverse pelvis rotation.
• To analyze the impact on mechanical and metabolic gait features.

Main Methods:

• Two experiments involving 11 and 10 young adults, respectively, were conducted.
• Kinematic, kinetic, and oxygen consumption data were collected during normal walking and under two lateral stabilization conditions (free and restricted transverse pelvis rotation) at three speeds.
• Experimental setups were modified in the second experiment to reduce frame weight and increase habituation time.

Main Results:

• External lateral stabilization significantly reduced pelvis rotations, pelvis displacements, thorax rotation, arm swing, step length, and step width.
• Energy cost and vertical moment were not significantly affected by stabilization.
• New setups allowed for more normal frontal and transverse pelvis rotation compared to existing devices, though still less than normal walking; increased transverse pelvis rotation correlated with increased step length.

Conclusions:

• Current lateral stabilization systems constrain pelvis rotations and other gait variables like thorax rotation and arm swing.
• The developed setups improved pelvis rotation but did not fully restore normal thorax rotation or arm swing.
• More sophisticated designs are required to provide medio-lateral support without compromising other essential gait dynamics.