the preferred peek material from which the disc members 1518 and 1522 including the retainer members 1524 thereof are formed will provide the arms 1526 with sufficient strength and resiliency to provide a secure friction fit with the shaft portions 1528 snap fit therebetween while allowing for the shaft portions to be rotated to secure the disc members 1518 and 1522 to the corresponding vertebrae 1332 and 1334 more specifically the cam shafts 1516 and 1522 each include several cam lobe members 1530 spaced along the length thereof and a proximate disc indicator member 1532 adjacent drive head 1534 initially the cam shafts 1516 and 1520 are oriented 1480 degrees from their orientation shown in fig7 for insertion of the artificial disc 1452 into the intervertebral space 1330 with the cam shafts 1516 and 1520 received in the corresponding grooves 1498 and 1500 of the vertebral bodies 1332 and 1334 in this regard the cam lobes 1530 are rotated down into recessed slots 1536 formed in the upper surface of the upper disc member 1518 rotating the cam shafts 1516 and 1520 via the hex drive heads 1534 thereof by 1480 degrees from their insertion orientation to their secured orientation shifts the cam lobes 1530 into the recesses 1512 cut into the vertebral body grooves 1498 and 1500 as shown in fig7 in this manner the artificial disc implant 1452 is secured in the intervertebral space 1330 against extrusion out therefrom during articulation of the upper and lower disc members 1518 and 1522 relative to each other as the upper and lower vertebrae 1332 and 1334 shift via the arcuate bearing interface formed between the members 1518 and 1522 the disc indicator member 1532 is sized to be received in the counter bore portion 1514 of.