by an arc of a circle the radius of the circle being in the range 5 to 7 inches 13 2 to 17 8 cm preferably the frame 1 of length 2 35 inches 6 cm is available in three different lordotic curvatures flat arc of a circle of 5 inches 13 2 cm radius and arc of a circle of 7 inches 17 8 cm radius in use the titanium alloy frame 1 is placed over the spinous processes on the lamina with the substantially parallel frame portions 2 3 lying substantially parallel to the spine axis with vertebrae elements the spinous processes being received in the frame aperture 6 the vertebrae received within the frame 1 are immobilised with respect to each other and the frame 1 by fixation wires or cables looped around the frame 1 and around the lamina of adjacent vertebrae fixation wires or cables are looped through the slots 7 the grooves 8 and wire seats 9 the prior art spinal implants are smooth rectangular frames formed from metal rods whereas in the prior art spinal implants the looped fixation wires or cables are prone to slip parallel to the frame portion around which they are looped in the frame 1 of the present invention the fixation wires or cables are secured within a slot 7 or groove 8 and can therefore resist forces parallel to the frame portion around which they are looped the frame 1 of the present invention can therefore be rigidly anchored to the spine as will be seen from the drawings the preferred form of frame is symmetrical about a central plane along the longitudinal axis of the device a a in fig3.