| 摘要 |
<p>An improved knee prosthesis of the four bar kind as described in US-A-3823424 is provided, but which has a modified geometry of its links (5, 10, 15, 20) which permits the available degree of flexion to be increased to 143 DEG . Resilient means such as a coil or leaf spring (70) provides for extension bias at low angles of flexion, and since the anterior link (10) oscillates during flexion or extension movement resilient means (70) acting between that link (10) and another link (5) of the joint biases the joint towards its fully flexed position at high angles of flexion. An improved lock for the joint is also provided.</p> |
