The Hy-Stan 4 Bar Knee Series is a polycentric prosthetic knee joint. It is available in two versions: C-TK-4000S and C-TK-4001S. The C-TK-4000S has no thread at the centro-bolt of the knee head. The C-TK-4001S also has no thread at the centro-bolt of the knee head, but it also has a manual locking function.
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