When choosing a prosthetic foot board, it is important to consider three factors: weight, activity, and length of the remaining limb. If people who are light in weight and do not travel frequently use foot boards designed for high-weight individuals and high-intensity sports, they may feel that their feet are too hard to step down. In addition, people with short residual limbs and skin problems can choose foot boards with torsion balls to achieve better shock absorption and protect their skin. In contrast, those with long residual limbs require relatively low height foot boards.

FS4 is designed specifically for amputees with long residual limbs to meet their needs for versatile prosthetic feet. FS4 has a large forked structure, with good inward and outward flipping functions, suitable for all road conditions and more safe. FS4 has perfect high energy storage and release function, and its effective vertical shock absorption function reduces the impact on the end of the residual limb, knee joint, hip joint, and spine. There are nine levels of weight activity available for selection, with a maximum load-bearing capacity of 166KG.

The characteristics of the motion curve of the ankle joint indicate the smooth and balanced rolling motion of the foot board. Compared with normal human movement, there is no significant difference between the flexion angle of the ankle joint and that of the healthy foot (as shown in the left figure). This means that the prosthetic foot is very close to the movement state of the ankle joint of a healthy foot. When the heel hits the ground and rebounds, the performance of the prosthetic foot and the healthy foot is also very similar, indicating that the function of the prosthetic limb is very similar to that of the healthy limb. Therefore, during walking, it can effectively reduce the pressure on healthy feet (as shown in the right figure).

Clearance & Weight：
Size: 22-25 cm  26-28 cm  29-31 cm
Existing size: 1.8 in  2.0 in  2.2 in
Spring board: 305g  370g  435g
Foot shell: 127g  159g  219g

Technical parameters
Size: 22-30 cm
Maximum load capacity: 365 lbs
Hardness level: 1-9
Connector: Integral male pyramid
Heel height: 10 mm 3/8’’
Warranty period: 36 months