Oregon Orthotic Services, Inc.
Orthotics & Prosthetics
Welcome to Oregon Orthotic Services, Inc.

Hours of Operation:
Monday – Friday,
8 a.m. – 5 p.m.

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NW 503-242-9136

   

Prosthetics


Prosthetics are devices that replace a part of the body that have been removed due to trauma or disease.  A prosthesis consists of a socket (the portion that is in contact with the residual limb), interface (the type of material against the skin), components that allow the practitioner to symetrically align the prosthesis and then either a terminal device for an arm, or a prosthetic foot for a leg.  Mechanical knees, elbows, shoulders and hips can be part of the componentry if necessary.  Listed below are some of the common terms and treatments used in prosthetics.

Below the Knee (BK) or Trans-Tibial Amputation (TT)
 These are the terms used to describe the limb of a person who was either born without or has received an amputation below the knee. These individuals still have control of their knee joint but do not have an ankle or a foot. For these clients, we sometimes incorporate the shape of their knee anatomy into the  design of the socket for suspending the prosthesis. Other suspension techniques may include suction or mechanical locking devices used in conjunction with a roll-on gel liner. The gel liners provide a two-fold job. First, as a skin-socket interface to protect the limb from excessive  irritation and second, to provide suspension. The liners can come with pin attachments that slide into a locking mechanism in the bottom of the prosthetic socket.

 Above the Knee (AK) or Trans-Femoral (TF)
These are the terms used to describe the limb of a person who has lost their leg above the knee.  For these individuals they no longer have a foot, ankle or knee. These patients may also take advantage of  the same gel liner technology that incorporates a pin for suspension or traditional suction to suspend their prosthsis. With this type of amputation special care is taken in designing the socket, supension and choosing the appropriate knee and foot that will best fit the activity level and needs of the patient.

Knee Disarticulation
 A knee disarticulation is an amputation in which the person has lost their limb or had an amputation through the knee joint.  This means they
have a full-length femur, "thigh bone" but no functional use of an anatomical knee joint so a mechanical knee is used in its place. The knee disarticulation prosthesis would have similar component make-up to that of an above knee amputation.
 
Symes
This is the term used to describe an amputation that is through the ankle joint.  For a person with this type of amputation, they have a full-length tibia and fibula, but no ankle joint and foot.  For most of these patients, the shape of the limb itself can be used to suspend the device with the use of either a foam or gel liner.
 
Partial Foot
 For a person with a partial foot amputation, selected areas of the foot may have been removed or did not develop normally in utero.  Depending on the amount of involvement, a traditional custom molded foot orthotic "arch support" with a soft foam toe filler may be used in the patients shoe.  Others may require a more technologically advanced device, including the previously discussed orthosis as well as a carbon graphite Ankle Foot Orthosis (AFO). Combining these orthoses will provide a
supportive/protective interface for the foot and resistance from the AFO as the patient walks over the ball of the shoe. The increased resistance from the AFO prevents a "drop off" effect and allows a person to walk  over the shoe with a smooth and symmetrical gait.  With the use of either the traditional or advanced orthoses, a patient has the ability to regain and maintain high levels of walking activity.
 
Upper Extremity Prosthetics
 Replacing a hand with an upper extremity prosthesis can be done
for cosmetic reasons, or for functional reasons allowing a patient to regain function with use of a grasping terminal device.  These grasping devices can make it easier to stabilize objects while patients are working with the other hand or to pick up objects directly.  To control an traditional upper extremity prosthesis, a harness and cable over the opposite shoulder is used along with a patients body motion to open and close the terminal device or hand.  More recent technology (myoelectrics) allows us to provide small electronic sensors within the prosthetic socket and next to the skin to pick up muscle activity and electronically open and close the device.  The different levels of amputation for the upper extremity are below the elbow (BE) or Trans-Radial (TR), above the elbow (AE) or Trans-Humeral (TH), and shoulder disarticulation (through the shoulder).
 
Cosmetic Restoration
 The desired goal of a person's prosthesis may be more for cosmetic reasons rather than function.  For these individuals, there are a number of custom options we provide that can bring the prosthesis as close to matching the sound side as possible. This may include shaping the prosthesis cover to measurements or providing a custom silicone partial finger or or hand that matches the skin tone of the sorrounding extremities. These are types of prostheses are fabricated and shaped to a desired look with careful molding, evaluation and fabrication techniques.

 

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