Background: In the last two decades lumbar interspinous decompression systems have gained a wide and often uncontrolled diffusion. Such devices, usually made of titanium or PEEK (polyetheretherketone), are currently implanted in different lumbar spine degenerative disorders, and clinical indications to their use are often confounding. Methods: This is a single center, single arm, 2-year prospective study of 50 patients undergoing lumbar surgical interspinous decompression, in which the BacJac all-PEEK device was implanted. Preoperative diagnosis was: central (CLS) or foraminal (FLS) spinal stenosis, degenerative antero/retro listhesis
