There are many types of Medi-Rehatek double-axis prosthetic knee, the structure and function of these knees are more similar. Its upper and lower axis as the rotation center makes knee flexion. The lower part of the thigh is composed of two curved surface with different radius, and the curved surface is connected to the upper part of shank withsliding action. The advantage of double-axis knee is the use of double-axis features and mechanical friction braking to increase the stability of knee movement, so that amputee can walk on the uneven ground, the price is relatively cheap. The disadvantage is that the different design will increase the mechanical friction, and sometimes too strong friction may lead to the difficulties of knee flexion. As a result of structural reasons, the durability of such products is not very good, the controlperformance of knee is not good in the swing phase.Differences in characteristics of each knee joint results in poor alignment and increasing weight. 3, Multi-axis prosthetic knee There are many types of multi-axis prosthetic knees,but the principle of structure is as similar as double-axis prosthetic knee. Multi-axis knee joints mostly use the structure of multi-bar, amputee can have up and down,front and back movement on a large scale large range of movement up and down before and after, such knee jointis known as the multi-bar knee joint. The advantages of this knee joint is that thesafety performance is high and a buffer structure prevents the lower part from stumbling in the support period. The use of hydraulic cylinder decreases the resistance of knee flexion in second half of support period, it also has an auxiliary stretch spring with certain degree of activity. The disadvantage is similar as the double-axis knee because their structure is the same. Relative blog: What causes amputation
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