| 摘要 |
A disc prosthesis (P) for use on a pair of adjacent vertebrae (V, V') comprises upper and lower plates (10/12) adapted to be mounted respectively to adjacent upper and lower vertebrae (V, V') typically using screws that extend through holes defined in the plates (10/12) and into the vertebrae (V, V'), a joint mechanism (16) linking the upper and lower plates, and a damping system (26). The joint mechanism and the damping system are adapted to allow for biased relative movements between the upper and lower vertebrae (V, V'). For instance, the joint mechanism comprises a substantially V-shaped joint (16) extending at least partly in an intersomatic space (S). The V-shaped joint (16) has a pair of arms (18, 20) adapted to pivot relative to each other thereby allowing for at least one of an extension and a contraction movement between the upper and lower vertebrae (V, V'), with the damping system (26) being adapted to act on the V-shaped joint (16). |
