Abstract: Instrument kit and method for performing posterior lumbar interbody fusion. The surgical procedure is done through the spinal canal rather than outside the spinal canal as has been done previously. The posterior lumbar interbody fusion procedure is faster, simpler, less bloody and less expensive than prior art vertebrae fusion procedures. The surgical procedure of this invention is carried out using a novel instrument kit comprising first and second shafts, first and second chisels, a retaining ring with set screw, an extraction hammer, a tamper, and a hook.