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Abstract
Revision of lumbar fixation is now a major challenging issue in neurological surgery practice and used in different clinical settings such as adjacent segment failure, maldirected or broken screws. The reasons for failure are many and varied. Broken screws, spinal stenosis, pseudarthrosis and spinal instability top the list of causes. Patients who were helped the most by revision surgery had spinal stenosis or else instability in the lumbar segment above or below the previous fusion. Surgical treatment options are removal of the screws whether maldirected or broken and fixation by instrumentation or not according to the stability, or extension of instrumentation in case of adjacent segment failure