The auther has studied 60 patients of degenerative spondylolisthesis diagnosed and operatively treated at Hanyang University Hosptial from January 1987 to June 1992. And analized the outcome.
@ES The results were summarized as followings:
@EN 1) Male to female ratio was 1:4, showing female predominance. Average peak ages were 5th and 6th decades.
2) "Pedicle-Facet Angle" and the degree of slipping had directily proportional relationship (Y=0.58X+110). The wider the angle is. the more slipping develops.
3) The significant symptom and sign were neurogenic intermittant claudication and negative straight-leg-raising test.
4) The degenerative spondylolisthesis developed most frequently at L4-5 level (74%), L5-Sl (15%), L3-4(8%). 57 cases (95%) fell into Grade by Meyerding classification.
5) Complete or incomplete block on myelogram was present in 59%, and pseudodisc and lumbar spinal stenosis were noticed on CT.
6) Laminectomy with P. L. I. F. were done in 50cases (83%) and total laminectomy and medial facetectomy and foraminotomy were done in only 4cases (7%). In the comparision on the slipping degree before & after operation, in 55cases (92%),
slipping
degrees showed no great change less than 2mm, but the almost showed exellent & good results. So we considered decompression & fusion without excessive reduction was sufficient.
7) Threaded fusion cage (T. F. C) had the several benifits that 1) stability was good, 2) osteosynthesis through threaded was possible and 3) postoperative ambulation was possible earlier. Therefore recently, P. L. I. F. using T. F. C in the
treatment
of degenerative spondylolisthesis were used in many cases and further evaluation for T.f. C. should be considered.
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