الفهرس 
Postlaminectomy segmental instability of the lumbar spine
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Abstract
The segmental instability of the lumbar spine has been defined as an abnormal movement in segment as a response to applied load. The aim of the study is to detect the cause of chronic low back pain following the lumbar laminectomy, how to diagnose the instability pain and the outcome after surgical fusions of 50 cases. All patients including males and females with all ages complaining of intractable chronic low back pain. The surgical intervention was in the form of lumbar transpedicular fixation in all cases, and then all cases will be followed up clinically up to 18 months according to pain improvement. Pain was evaluated in the last follow up by Ricciardi JE grade and low back pain measured by Oswestry disability index (ODI). The study shows that 20 patients graded as excellent while 30 patients have back pain, 18 patients graded as good while 12 patients graded as fair. The posterolateral fusion to be an effective treatment for management of cases with post laminectomy lumbar instability