Total knee prosthesis HF P/S

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Restricted flexion of the knee is still a common complication in patients after total knee arthoplasty. For patients, who desire to keep their postoperative ability to perform activities that require full flexional movement range of their knee, the BIOTECH HF P/S - High Flexion Posterior Stabilised Knee offers an optimal solution. At deep flexion angles, the contact areas inside the knee decrease significantly, while the contact pressure increases. With the idéal length and design of its posterior fémoral condyles, the new special design of the H F P/S fémoral component greatly improves the contact mechanics of the femorotibial articulating interfaces, providing the largest contact area and the lowest pressure, making it possible to safely attain a high range of flexional movements, even beyond 156°. During flexion, a compressive femorotibial force is generated due to the interaction between the soft tissues and the prosthesis geometry. While implants without posterior stabilization show a significant increase in this compressive force after a flexion of 90 degrees, the HF P/S prosthesis maintains a low force throughout the range of motion. Therefore the posterior-stabilized design of the HF P/S offers a real advantage in reducing soft tissue tension during extreme flexion. The range of motion after a total knee arthroplasty can be supported by the prosthesis design, however, other important factors, such as preoperative range of motion, knee joint kinematics, restrictions by soft tissue, and the implantation technique ail play also a very significant rôle in the postoperative knee function.