Although the majority of adult patients with low grade lytic spondylo-listh.esis can be satisfactory managed with conservative measures, active patients with severe symptoms are uncommonly become satisfied with non operative modalities. A prospective study was conducted on twenty-three adult patients (13 males and 10 females) with clinically manifested low grade lytic spondy-lolisthesis, they underwent surgical treatment after failure of conservative measures for a minimum period of 6 months. All patients were assessed clinically and radiologically prior to surgery. Great attention was paid re-garding proper patient selection. The protocol of surgical manage-ment consisted of: Extended Gill s decompression procedure, in situ pos-terolateral intertraftsverse fusion and pedicular fixation of the affected segment. After an average follow up of 19 months, the results obtained from this work are quite satisfactory, with an overall fusion rate of 96% and a satisfactory (excellent and good) clinical outcome in 87% of pa-tients.
Introduction spondylolisthesis was described in 1955 by Taillard as a forward slippage of the vertebral body with its pedicles, transverse processes and upper articular processes en-
-gendered by a break in the conti-nuity or an elongation of the pars interarticularis Nazarian, 1992 described a better definition 'slip-page of a portion of the spine on the underlying portion'.
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