Degenerative processes of the lumbar spine consist of several disorders of various etiologies with different radiological manifestations. Computed tomography (CT) is well suited for evaluation of these processes since contours of soft tissues, subtle bone structure changes and small calcifications are easily demonstrated with this technique. Spiral CT scanning provides fast data acquisitions, and volumes of high quality for multiplanar reformatting. This review article describes the CT scanning techniques and diagnostic findings of the most common degenerative processes of the lumbar spine.