The invention relates to a spinal implant (10) having, at a first end, fastener (20) for fastening to a vertebra, and at a second end, an assembly head (22) extending along an axis x-x′, the head (22) including a housing (26) that is open away from the fastener (20) and that presents a section that is substantially U-shaped, the head (22) being suitable for receiving a connection rod (30) extending transversely to the axis x-x′ and for securing it by clip insert (40) and by locknut (50) According to the invention, in the assembled position, the clip insert (40) and the locknut (50) are fully received within the assembly head (22), and in that the clip insert (40) are mechanically decoupled from the locknut (50).