Segmental instrumentation of the posterior spine

摘要: Improved instrumentation of the posterior spine includes a threaded screw for insertion into sacrum, adjusting rods and intravertebral hook device on end rod. One rod pivotal clevis assembly an automatic safety interlock securing to screw. The receiving bone spaced arms receive which is inserted rotated locking position. Thereafter, hooks are positioned lamina adjusted compression or distraction. hex area then wired. generally triangular orientation provides added strength wider foot print attachment will resist rotational forces. Also disclosed improved facilitates placement cement in desired location.