Socket-leg Interface Movements in Transtibial Amputees

Socket-liner motion is quantified using a 3D optical motion-capture system to measure the relative movement between the prosthetic socket and liner during functional activities. Motion is recorded in millimeters (mm).

Typical motion values are expected to fall within the range of 0-20 mm.

Proximal-distal Socket-Leg Motion is quantified using a 3D motion-capture system to measure the relative movement between the prosthetic socket and the remaining leg during functional activities. Motion is recorded in millimeters (mm).

Typical motion values are expected to fall within the range of 0-30 mm.

This measure quantifies the torque at which transverse rotation begins between the prosthetic socket and liner. Torque is measured in Newton-meters (Nm) using a dynamometer.

Step length is quantified using a 3D motion-capture system during functional activities. Step length is recorded in centimeters (cm).

Step length asymmetry will be assessed using 3D motion analysis instrumentation. Asymmetry is computed on step length (cm) of the prosthetic and intact legs, by dividing the difference between legs by the average of both legs. 0 marks perfect symmetry and greater values higher asymmetry. There is no maximum limit, but most values are expected to be below 1.

Gait velocity is quantified using a 3D motion-capture system during functional activities. Gait velocity is recorded in meters per second (m/s).

The Socket Comfort Score is a patient-reported numerical rating scale used to assess prosthetic socket comfort. Participants rate their comfort on a 0-10 scale, where 0 represents the most uncomfortable socket imaginable and 10 represents the most comfortable socket imaginable.

Comfort is evaluated for each of the three suspension conditions. For every condition, the participant provides the score immediately after completing the turning task and treadmill-walking task, both performed within 60 minutes of fitting the corresponding suspension system.

Perceived functional ability is assessed using a patient-reported numerical rating scale that captures the participant's subjective evaluation of how well they are able to perform functional activities with the prosthesis. Participants rate their perceived functional ability on a 0-10 scale, where 0 indicates the lowest perceived functional ability and 10 indicates the highest perceived functional ability.

For each of the three suspension conditions, participants provide this rating immediately after completing the turning task and treadmill-walking task, both performed within 60 minutes of fitting the respective suspension system.

The Prosthesis Satisfaction Score is a patient-reported numerical rating scale used to assess overall satisfaction with the prosthetic limb. Participants rate their satisfaction on a 0-10 scale, where 0 represents the lowest possible satisfaction and 10 represents the highest possible satisfaction.

For each of the three suspension conditions, participants provide this rating immediately after completing the turning task and treadmill-walking task, both performed within 60 minutes of fitting the corresponding suspension system.

Socket-Leg rotation is quantified using a 3D motion-capture system to measure the relative movement between the prosthetic socket and the remaining leg during functional activities. Motion is recorded in angles (degrees).

Typical values are expected to fall within the range of 0-15 degrees.

Step length is quantified using a 3D motion-capture system during functional ctivities activities. Step length is recorded in centimeters (cm) and presented as percentage of bodyheight.

The knee angle is quantified using a 3D motion-capture system during the functional activities and presented in degrees as a function of the gait cycle.

The hip angle is quantified using a 3D motion-capture system during the functional activities and presented in degrees as a function of the gait cycle.

The foot progression angle is quantified using a 3D motion-capture system during the functional activities and presented in degrees.