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Through Knee Amputation

Throught Knee Amputation - Knee Disarticulation (KD) Amputation

A Through knee amputation is also called a knee disarticulation amputation and is a fairly common amputation where the leg is amputated through the joint line of the knee. This enables you to weight bear on distal end of the femur as the bone isn’t cut during the surgery. This isn’t possible in Trans Femoral and Trans Tibial amputations.

A Through knee prosthesis is challenging to use at first but with training independence from assistive devices such as crutches can be achieved after 4 to 12 weeks of receiving the prosthesis. Due the absence of a knee joint a prosthetic knee joint will be required.

The Knee Disarticulation Prosthesis

A through knee socket is custom made according to the shape and size of the residual limb and this custom made socket is the part of the prosthesis that interacts with your residual limb and the prosthetic components.

The prosthesis is suspended from the limb by means of a vacuum system, a silicone liner with a ring seal and one-way expulsion valve. It is usually not possible to use a pin lock system in this prosthesis as it will lower the centre of rotation of the knee. As it is with a Knee Disarticulation the centre of the knee joint isn’t symmetrical with the contralateral leg, this is due to the thickness of the liner, socket and the types of prosthetic knees available. Weight-bearing is distributed over the entire surface of the residual limb and the femoral condyles.

The prosthetic knee joint allows both flexion and extension and varies in function depending on which knee you and your prosthetist choose to use. Our prosthetists are experienced in using a wide range of knee joints and we are manufacturer certified to fit high-end componentry including the X3, Genium, C-leg and Rheo Knee joint.

A variety of feet can be used with this type of prosthesis and this will again be decided by you and your prosthetist.

Trans Femoral Amputation

The Trans Femoral (TF) amputation is also known as an Above Knee Amputation where the amputation site is through the femur. In this case the longer the amputation it is generally easier to fit a socket as the lever arm is longer. The shorter the lever arm the more effort the amputee has to exert to drive the prosthesis forward. As not every amputation is planned some residual limbs will be longer than others and the surgeons do their best to keep the residual limb as long as possible.

The Trans Femoral Prosthesis for Through Knee Amputation

A Trans Femoral socket is custom made for through knee amputation according to the shape and size of the residual limb, and is the most important part of the prosthesis as it interacts with the residual limb to ensure comfort and function.

At Chin and Partners, we provide a 6 month guarantee on all our socket fits which means that we will insure that the custom made socket fits as securely and as comfortable as possible. This is essential as the residual limb generally varies in size especially for a primary (first time) prosthetic wearer. For the more experienced amputee this guarantee allows the individual the time and security to ensure the socket fits the way they know it should fit and feel. During this time there is no cost for any consultations or modification that we make to the socket and the client can come in as often as they need.

The prosthesis is suspended by various methods that would be discussed during the assessment consultation. The main suspension methods are vacuum or pin lock, both with a silicone liner. Weight bearing is distributed over the ischium (sitting bone) and the entire surface of the residual limb with contact but no weight bearing on the bottom of the residual limb.

The prosthetic knee joint allows both flexion and extension and varies in function depending on which knee you and your prosthetist choose to use. Our prosthetists are experienced in using a wide range of knee joints and we are manufacturer certified to fit high end componentry including the X3, Genium, C-leg and Rheo Knee joint.

A variety of feet with varying properties can be used with this type of prosthesis and this will be selected by you and your prosthetist.

Flexion & Extension of Knee Joint

The knee joint allows both flexion and extension and varies in function depending on which knee you and your prosthetist choose to use. Our prosthetists are experienced in using a wide range of knee joints and we are manufacturer certified to fit high end componentry including the X3, Genium, C-leg and Rheo Knee joint.

A variety of feet can be used with this type of prosthesis and this will be decided by you and your prosthetist.

Patient Preferences

Some patients prefer to have their prosthesis uncovered with all the components exposed. Others prefer the prosthesis to look more life-like, while others want to make a statement with their prosthesis. We can assist with all options depending on your needs. Please let your prosthetist know if aesthetics is important to you so that the prosthesis can be made to look the way you want it too.