PROSTHETIC DISC FOR INTERVERTEBRAL INSERTION

摘要

A prosthetic disc (10) for insertion between adjacent vertebrae includes a core (16) having upper and lower curved surfaces (48,50), upper and lower plates (12,14), and peripheral restraining structure (26) on at least one of the upper plate (12) the lower plate (14) and the core (16). Each plate has an outer surface (18), which engages a vertebra and an inner curved surface (24) which slides over the curved surfaces (48,50) of the core (16). The peripheral restraining structure (26) serves to hold the core (16) against a curved surface (24) of at least one of the plates during sliding movement of the plates over the core.