الفهرس 
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Abstract
The term degenerative spondylolisthesis refers to an acquired anterior displacement of one vertebra over the subjacent vertebra associated with degenerative changes in the facet joints and disc material, without an associated disruption or defect in the vertebral ring.
Degenerative spondylolisthesis is an anatomic finding. The most commonly affected level is L4-L5 level. It is more common in females. The clinical symptoms of it are varied. Patients with lumbar degenerative spondylolisthesis can be asymptomatic. They can also present with axial back pain, radicular pain, neurogenic claudication or neurological deficit.
The majority of patients with symptomatic degenerative lumbar spondylolisthesis and an absence of neurological deficits will do well with conservative treatment meanwhile patients who present with sensory changes, muscle weakness, or cauda equina syndrome, are more likely to develop progressive functional decline without surgery, also patients suffering from severe incapacitating pain interfering with daily activity that failed to respond to at least 6 months of conservative treatment may benefit from surgery.
Aim of surgery in degenerative spondylolisthesis is decompression with or without fusion with or without instrumentation.
Instrumented fusion when done with decompressive laminectomy, patients will have less chance of progressive slippage postoperatively than laminectomy alone or non instrumented fusion and and also there will be better relief of low back pain and radicular pain.
The aim of our study was to determine the clinical , radiological and functional outcome in patients with low grade degenerative spondylolisthesis undergoing unilateral trans facet screw fixation with contra lateral pedicle screw fixation done in the symptomatic side in unilaterally symptomatic patients or in the worse side in bilaterally symptomatic patients or in any side if the presentation is of the same degree bilaterally according to the preference of the surgeon which is followed by posterior lumbar inter body fusion(PLIF( or posterolateral fusion.