Study on How Postoperative Scar Affects Spinal Movement After Removing the Front Part of the Lumbar Disc Annulus to Insert a Lumbar Disc Prosthesis

What this Trial Is About

Researchers are studying how removing the anterior portion of the annulus fibrosus during the implantation of a complete lumbar disc prosthesis affects spinal movement. This part of the annulus normally limits extension and axial rotation, so its removal may increase these movements. The study also evaluates whether the postoperative prevertebral scar reduces these abnormal movements and if repairing the anterior annulus during surgery improves patient outcomes. The trial involves two groups one where the anterior annulus fibrosus is removed during disc prosthesis insertion, and another where the annulus is opened as flaps and replaced after prosthesis insertion. Participants will be randomly assigned to one of these groups. The study uses assessments like the Oswestry scale, SF12, and imaging to evaluate facet joint arthritis and disc degeneration. Participants will be monitored over time, with the primary outcome being the range of spinal segment movement at the L4-L5 level one year after surgery. Researchers will also assess pain and function scales, imaging results, and the presence of the prevertebral scar. This information aims to guide recommendations on when patients can safely resume normal activities and work after surgery.

Postoperative Scar in the Control Excess of Mobility Induced by Annulus Removal on Inserting a Lumbar Disc Prosthesis