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This can be useful for walking on uneven terrain.

With the loss of the foot and part of the leg, the amputee has lost important proprioceptors and muscle groups which, through their interplay, ensure a harmonious gait pattern under physiological conditions. The DeltaTwist® shock absorber, which also features a torsion function, is able to compensate for this loss to a certain degree. Its shock absorbing function and torsion function provide more safety, mobility and comfort. With its integration into the prosthesis, a more symmetrical gait pattern can be achieved. Instabilities can be eliminated and compensating movements are reduced. It relieves the locomotor system and residual limb. Both shock absorption and the torsion function can be adjusted individually and independently by means of various elastomer components of different durometers. This allows the specific movement pattern of every amputee as well as biomechanical insights to be taken into account. When needed, interior or exterior torsion can also be suppressed using the rotation locking segment (see accessories).

The following is an overview of some of the products relating to this area of prosthetics.

Used correctly, the system offers many benefits over conventional prostheses including: unrestricted vascular flow (healthier for the tissues); control of swelling and edema; volume management; and enhanced linkage of the prosthesis to the residual limb.

Ask us at Custom Prosthetic Services Ltd.

Prosthetic prescription and torsion adapter settings for each participant are shown in .

Pneumatic knee units are usually lighter in weight and less heavy duty than hydraulic knees.

Hydraulic Swing Control Knees (Impact Level High)

A hydraulic fluid cylinder is installed in the knee that uses principles of fluid mechanics to vary the resistance of the knee as the user changes their walking speed.

This allows the individual to walk at different cadences and have the prosthetic knee keep pace to ensure the prosthesis is always in the correct position for safety when placing weight onto the prosthesis at heel contact.

at Custom Prosthetic Services Ltd.

Some of the photos show the prosthetic feet without their accompanying cosmetic covers.

Key words: amputee, kinetics, moment, prosthesis, rehabilitation, rotation, torque, torsion adapter, transtibial, transverse plane, turning.

Geoffrey Hall, our Canadian Certified Prosthetist, and Scott Hamilton, Registered Technician, are familiar with the complete range of componentry and materials used in the manufacturing of both traditional and modern state-of-the-art artificial limbs.

While they do add weight to a prosthesis, they reduce torsional stress on tissue.
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It is also and excellent safety feature for stumble recovery.

Rubber bumpers within the ankle structure absorb ankle motion induced by body weight.

Dycor Foot

Multi Axis (Moderate Impact Level)

Rubber bumpers in the ankle mechanism permit a rocking motion of the foot from heel to toe as well as from side to side.

At Custom Prosthetic Services Ltd.

These feet can be quite light and are also suitable for prostheses intended for use around water.

Sach Foot

Single Axis (Low Impact Level)

A hinged ankle joint is incorporated into the prosthetic foot.

provides state-of-the-art prosthetic socket design and components.

Generally these feet do not have much stored energy return and they have a softer feeling underfoot than the SACH feet.

Endolite Foot

Stored Energy (Moderate to High Impact Level)

These feet have an internal structure that acts like a spring.

Comfort begins with a properly designed socket.

Thirty-five 14 mm reflective markers were placed on each participant at locations consistent with Vicon's Plug-in-Gait full-body model (Oxford Metrics; Oxford, England). Measurements were taken for each individual according to the Vicon requirements for static and dynamic modeling. Participants were instructed to walk around a 1 m-radius circle at constant walking speed, both clockwise and counterclockwise, for three repeated trials for each adapter condition, keeping their body centered on a line marking a circular path. They were told that stepping on the line did not matter. Participants were allowed to practice this task before data collection. Preliminary trials were collected, both clockwise and counterclockwise, until two trials in each direction were within 10 percent of the same walking speed. Continuous walking speed was measured throughout each turning trial by the method of tracking velocity of the outside limb's posterior superior iliac spine marker immediately following each data collection. These preliminary trials allowed the subjects to acclimate to the turning task and established their self-selected turning walking speed. A constant speed 1 m-radius turn was chosen because it represented a typical radius turn found in daily activities (e.g., a 90° hallway turn) but minimized the confounding effects of variable speed gait [14]. Participants also completed three repeated trials walking in a straight line at the same walking speed as the turning trials.

Published Date: September 29, 2015

Extreme Impact Level:

Daily activities involving rigorous walking, running and heavy lifting.

Example: Heavy manual labor including lifting, track and field sports.

SACH, Solid Ankle Cushioned Heel (Low Impact Level)

This foot has a wedge-shaped cushion in the heel that compresses with each step and a simple internal supportive structure embedded in a foam cosmetic shape.

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