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Asymmetrical Loading Demands in Vertical Jump Landings for Unilateral Transtibial Amputees

This study assesses loading symmetry during vertical jump landings to understand the role of intact and prosthetic limbs in controlling downward momentum of the center of mass. The findings suggest a potential injury risk for individuals with unilateral transtibial amputation during landing.

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Asymmetrical Loading Demands in Vertical Jump Landings for Unilateral Transtibial Amputees

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  1. Asymmetrical loading demands associated with vertical jump landings in people with unilateral transtibial amputation Marlene Schoeman, PhD; Ceri E. Diss, PhD; Siobhan C. Strike, PhD

  2. Aim • Assess loading symmetry during vertical jump landings to determine role of intact and prosthetic limbs in controlling downward momentum of center of mass during landing. • Relevance • People with transtibial amputation (TTA) are encouraged to engage in recreation sports for health and mechanical benefits. • Most recreational sports involve jumping.

  3. Method • Participants • 6 with unilateral TTA and 10 nondisabled. • Completed 10 maximal vertical jumps. • Assessment • Contralateral symmetry (Symmetry Index). • Symmetry at group level (Mann-Whitney U Test).

  4. Results • Participants with TTA demonstrated: • Quasi-unilateral landings onto intact limb. • Due to either incapability of prosthetic ankle to plantar flex or increased residual-limb knee and hip flexion. • In loading phase, reduced prosthetic-side peak vertical forces, ankle range of motion, extensor moments, and negative work generated. • Individual asymmetries evident in: • Peak vertical force magnitudes, duration from touchdown to peak vertical force, ankle joint angles at touchdown, ranges of motion, knee and hip extensor moments, and work done at ankle.

  5. Conclusion • For people with TTA, there is a potential injury risk associated with landing. • Indicated by their high peak forces from significantly lower landing heights than nondisabled participants.

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