Abstract
Design
A retrospective study was performed in isthmic and degenerative spondylolisthesis patients who had undergone posterolateral fusion (PLF) only (group Ⅰ) or posterolateral fusion (PLF) with posterior lumbar interbody fusion (PLIF) (group Ⅱ).
Objectives
The objective of this study was to help in the selection of a surgical treatment option for spondylolisthesis.
Summary of Literature Review
Irrespective of whether groupⅠ or groupⅡ, satisfactory results have been reported in the surgical treatment of spondylolisthesis. However, isthmic and degenerative types have not been investigated in terms of outcome.
Material and Methods
We analyzed 112 patients (Isthmic: groupⅠ(32), groupⅡ(22), Degenerative : groupⅠ(37), groupⅡ(21)) who underwent surgical treatment for spondylolisthesis between A pril 1995 and December 2000. Kirkaldy-Willis criteria, radiologic union state, reduction ratio of slippage, change of disc space and change of segmental angle were analyzed as indicators of outcome.
Results
We found the following by radiologic analysis: In isthmic spondylolisthesis, groupⅡ was better than groupⅠ in terms of reduction ratio of slippage (reduction loss:3.38% vs. 2.3%, P=0.15), change of segmental angle (reduction loss : 2.11 °vs. 1.6°, P=0.15), bone union (83% vs. 92%, P=0.45) and change of disc space (reduction loss : 2.83 mm vs. 1.9 mm, P=0.02). In the degenerative spondylolisthesis, groupⅡ did not show significant difference from groupⅠ in terms of reduced slippage (reduction loss:3.8% vs. 3.85%, P=0.47), change of segmental angle (reduction loss: 2.73。 vs. 2.64。, P=0.43), bone union (80% vs. 87%, P=0.72) or disc height (reduction loss: 3.2 mm vs. 3.14 mm, P=0.45).
In terms of clinical outcome, groupⅡ was better than groupsⅠ in cases of isthmic spondylolisthesis (fair≤:85% vs. 93%, P=0.72), however, groupsⅡ was not better than groupsⅠ in cases of degenerative spondylolisthesis (fair≤:83% vs. 85%, P=0.23).
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