Below Knee Prosthetic Limbs

Below Knee Limb Loss and Prosthetic Limbs

Below knee limb loss refers to the amputation or absence of the leg below the knee. You may hear this type of surgery referred to as a "below knee amputation" or "BKA".

This type of amputation can come be a result of complications of vascular diseases or other conditions that affect blood flow, such as diabetes or peripheral arterial disease. Chronic vascular problems can lead to tissue death in toes, feet and legs. There are other ways that a BKA can happen, such as a trauma event, cancer, infection or congenital (born with a limb difference).

A below knee prosthesis is comprised of a suspension sleeve (or belt), socket, shin tube/pylon and prosthetic foot.

Standard Features of a Below Knee Prosthesis

Suspension (not shown) – This holds the artificial limb on to your residual limb. There are different types of suspension. Neoprene or textile type sleeves work due to their friction or “grab” to the thigh and top of the prosthesis. Sometimes a belt or strap may be used to suspend the socket.

Socket – This is the part of the artificial limb that your residual limb fits into. It can be made of thermoplastic, metal or laminated material.

Liner – This is a removable inner socket made of flexible material most often used for below knee artificial limbs.

Shin Tube/Pylon – This lies between the socket and the prosthetic foot. It is made of strong lightweight material such as carbon fibre, aluminium or titanium.

Prosthetic Foot & Ankle – There are many different types of feet and ankles available. Your individual needs will influence the choice made. (Scroll down on this page to view Blatchford's prosthetic foot options.)

Biomimetic Design in the Ankle and Foot