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Lower Extremity Prosthetics
“Journey seems much happier when he’s wearing his prosthetic paw…he instinctively knows this is a good thing…and he gets a lot of attention when he tours hospitals visiting amputee patients.”
-Pat Graff,
on behalf of her dog Journey, who was born without most of his left leg. He now runs around on a prosthetic paw, custom designed by Westcoast
for the rigorous life of a golden retriever.

According to the National Limb Loss Information Center, there are approximately 1.6 million people living with limb loss in the United States, and it is estimated that one out of every 200 people in the U.S. has had an amputation. The major causes of lower extremity amputations are diseases such as diabetes or peripheral vascular disease, trauma, congenital conditions and tumors.

Depending upon the cause of the amputation there are different levels of lower extremity amputations, listed below.

Transmetatarsal

The transmetatarsal amputation is more involved than a simple toe amputation. This type of amputation can sometimes cause one to lose all five toes. However, in most cases a simple shoe filler can help relieve any problems with gait.

Chopart/Symes

A chopart or symes amputation is performed at the ankle joint.

Transtibial

A transtibial amputation, is an amputation that occurs below the knee joint. Most patients who receive transtibial amputations are very successful prosthetic wearers. There are numerous suspension systems and designs available for transtibial amputees. The patient’s prosthetist will work closely with the patient to determine his or her goals and activity levels to create the appropriate prosthetic system.

Knee Disarticulation

A knee disarticulation (sometimes called a ‘through knee’) is an amputation that involves keeping the femur intact, but the tendons and ligaments attaching the femur (thigh bone) to the tibia (shin bone) are detached.

There are several advantages of the knee disarticulation over the traditional transfemoral (above-knee) amputation. The first advantage is decreased rehabilitation time since there is less trauma to the femur. Secondly, the adductor group of muscles (the muscles that bring the leg towards the body) is left intact because the bone is not cut. As a result, the patient will have more control over his/her residual limb. The third advantage is that the end of the femur can take some weight bearing at the bottom instead of through the ischium (sitting bone). As well, the length of the residual limb is as long as possible (the entire femur). More length equals more control over the prosthesis. This translates into more stability and a better gait.

The knee disarticulation level presents an interesting challenge to the patient and the prosthetist. For one thing, the end of the femur is larger than the area above it, which means it can be difficult to accommodate this area. As well, the bone is so long it can lower the person’s knee center compared to the opposite side. Due to these kinds of challenges, few prosthetists, when consulted prior to amputation by a surgeon or patient, will recommend this level over the traditional transfemoral level. It can be a difficult level to fit unless the prosthetist has unique fitting techniques. Westcoast Brace & Limb’s prosthetists have many years of experience fitting this unique level of amputation.

Transfemoral

A transfemoral amputation, or otherwise known as an above-knee amputation, occurs in the thigh, through the femoral bone (femur). While no amputation is easy to adapt to, the transfemoral amputation does offer more challenges than the lower level amputations. This level of amputation definitely requires more energy when walking with a prosthetic device. A transfemoral prosthesis is more complex because of the addition of a knee joint. There are many systems available for amputees, including many high-tech options.

Hip Disarticulation & Hemipelvectomy

The hip disarticulation amputation involves removing the femur in its entirety, but leaving the pelvis intact. The hemipelvectomy amputation involves removing the femur and a portion of the pelvis. These are the least common levels of amputation. The main causes for these types of amputations are trauma and osteosarcoma (cancer).

Since these amputations are not very common, the average prosthetist will only see a handful of patients at these levels in his/her career. The prosthetists at Westcoast Brace & Limb have worked with many patients at these difficult levels and have developed some specific techniques that have improved the comfort, fit and function of hip disarticulation and hemipelvectomy patients.

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Journey
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Journey is a five year old golden retriever born with most of his left front paw missing. He was brought to Westcoast Brace & Limb three years ago and successfully fitted with a custom designed, high-tech prosthetic paw, … MORE >



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