A modular pedicle screw comprising a tulip or receiver having a body comprising a through bore for receiving a screw having a screw head, the tulip or receiver also comprising a rod receiving channel for receiving a rod, the body comprising a seat for receiving and supporting at least a portion of the screw head, a wall having at least one resilient or elastic arm, the at least one resilient or elastic arm having at least a portion that is operatively positioned in relation to the screw head to retain the screw head in the tulip or receiver.
