| 摘要 |
The knee prosthesis has a single axis and a lever arm which is fixed in correlation and synergy with a quadriceps unit, a patella tendon, a kneecap, a patella ligament, so that it is never less than its natural length. The amplitude of the inflection is higher than normal. For this, the articulating axis connecting the femoral element to the tibial element is moved back on the horizontal level by 5 mm from the center of the two spherical portions corresponding to the natural axis so as to obtain an amplitude of inflection higher than the natural amplitude by at least 15 degrees, thus increasing the lever arm so that it proportionally reduces the effort (F) required to produce the flexion-extension.
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