The connecting plate (3) to be positioned adjacent to the vertebra is provided with two ribs (4) serving as fixing elements. The distance between the ribs (4) is bigger at the back and decreases gradually towards the front. Each of the ribs (4) has a straight vertical segment (5) at its inner side and an inclined segment (6) at the outer side, both segments (5,6) forming a pointed crest (7). The ribs (7) are automatically pressed into the bone tissue after the implant is inserted.
