Indicators of dynamic stability in transtibial prosthesis users.

Area of Science:

• Biomechanics
• Prosthetics and Orthotics
• Gait Analysis

Background:

• High fall rates in lower-limb prosthesis users necessitate better dynamic stability assessment.
• Current stability assessment methods are insufficient for varied walking conditions.
• Plantar pressure data offers potential for improved dynamic stability evaluation.

Purpose of the Study:

• To investigate dynamic stability in unilateral transtibial amputation individuals.
• To analyze stability using six specific parameters derived from plantar pressure data.
• To compare stability between prosthetic and intact limbs across different terrains.

Main Methods:

• Twenty community ambulators with unilateral transtibial amputation participated.
• Plantar pressure data collected using F-Scan Mobile during walking on level ground, uneven ground, stairs, and a ramp.
• Six dynamic stability parameters (plantar center-of-pressure perturbations and gait temporal parameters) computed for each limb and condition.

Main Results:

• Significant differences in stability parameters were observed between the prosthetic and intact limbs.
• Parameter values varied significantly across different walking conditions (level, uneven, stairs, ramp).
• Prosthesis users exhibited distinct dynamic stability characteristics compared to able-bodied individuals.

Conclusions:

• The six plantar pressure-derived parameters effectively differentiate dynamic stability in unilateral transtibial prosthesis users.
• Dynamic stability is influenced by limb (prosthetic vs. intact) and walking environment.
• Further research should refine parameter calculations and explore links between dynamic stability measures and fall risk.