PROSTHESIS FOR ARTHRODESIS OF INTER-VERTEBRAL DISC SPACE FOR ANTERIOR-POSTERIOR APPRAOCH

摘要

Prosthesis for the arthrodesis of a human spine's segment of anterior and posterior (PLIF-ALIF) approach, consisting of two parts that are assembled during their implantation to the patient, interbody space after disc removal. For the anterior approach a conical threaded cage and conical forked cage, for the posterior appraoch a cylindrical threaded cage and two simple rectangular cages are used. Our prosthesis achieves the desired outcome when we tie two vertebrae, (arthrodesis), by distracting the space efficiently and stabilizing it with the screwing treaded cage, then enlarging the prosthesis surface by assembling the rectangular one. No need for further support with pedicle screws, as the previous techniques. Our prosthesis which combines both types has the characteristic that nullifies the disadvatages that existed on each type separately, that is migration, subsidence and abolishes the need for use of other support systems. Speed is also gained through simple positioning, avoiding errors and the dangers much than the previous techniques, while we expect a perfect outcome.