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Trunk Postural Control During Unstable Sitting Does Not Explain Whole-Body Angular Momentum Control During Walking
Pawel R Golyski1,2, Brad D Hendershot1,2,3, Courtney M Butowicz1,2,3
1Extremity Trauma and Amputation Center of Excellence, Falls Church, VA, USA.
Journal of Applied Biomechanics
|April 25, 2026
Summary
Individuals with lower limb amputation exhibit greater whole-body angular momentum (WBAM) during walking. Trunk postural control during sitting does not explain these differences in WBAM control.
Area of Science:
- Biomechanics
- Kinesiology
- Prosthetics and Orthotics
Background:
- Uninjured individuals maintain whole-body angular momentum (WBAM) within a narrow range during walking.
- Individuals with lower limb amputation (LLA) show larger WBAM ranges, indicating disrupted control.
- The trunk significantly influences WBAM, and its control may be altered post-amputation.
Purpose of the Study:
- To investigate the relationship between trunk postural control during unstable sitting and WBAM control during walking in individuals with LLA.
- To compare trunk postural control and WBAM control between individuals with unilateral transfemoral amputation, unilateral transtibial amputation, and uninjured controls.
Main Methods:
- Compared trunk postural control during unstable sitting and WBAM ranges during walking.
- Utilized linear regressions to analyze relationships between trunk control and WBAM.
- Included 9 unilateral transfemoral amputees, 24 unilateral transtibial amputees, and 16 uninjured controls.
Main Results:
- Weak relationships were found between trunk postural control and WBAM ranges, especially in sagittal and transverse planes.
- Individuals with LLA demonstrated greater trunk postural control during sitting than controls.
- WBAM ranges during walking were larger in all planes for individuals with LLA compared to controls, with differences between amputation types.
Conclusions:
- Trunk postural control during unstable sitting does not account for altered WBAM control during walking in individuals with LLA.
- Differences in WBAM control during walking persist regardless of trunk control during sitting in this population.
