Evaluation of the Efficacy and Safety of the FACET FIXation Implant.

Inclusion Criteria: * Patient is ≥ 18 years old at the time of the surgery * The first back operation in the patient's life was for degenerative lumbar spinal stenosis * Surgical treatment of degenerative lumbar spinal stenosis by lumbar decompression with Pedicle Screw fixation or FACET FIXation implant. * Patient is able to understand the information related to the study * Patient consents to participate to the clinical investigation and agrees (non-objection) on the use of his/her personal data. Exclusion Criteria: * Patient received FACET FIXation implant or Pedicle Screw fixation with supplemental interbody cages. * Unilateral Pedicle Screw or FACET FIXation implant. * Preoperative grade ≥II spondylolisthesis * Preoperative scoliotic deviations \>25°. * Protected patient (under legal protection, deprived of liberty by judicial or administrative decision). * Patient not covered by a social security scheme.