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KMID : 0388420000100010069
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Konkuk Journal of Medical Sciences
2000 Volume.10 No. 1 p.69 ~ p.81
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Posterior interbody Fusion Using TFC in the Lower Lumbar Spine
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Youn Seung-Hwan
Cho Joon
Moon Chang-Taek
Chang Sang-Keun
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Abstract
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o determine which factors influence the successful results in the patients who underwent lumbar arthrodesis with TFC(threaded fusion cage) at L34 to L5S1 intervertebral space, 20 subjects were analysed in retrospective method... Between January 1997 and April 1998, interbody fusion with TFC was undergone on 20 patients, and among them, 19 patients (95 %) were confirmed to have bone fusion at 12 months after operation. All patients wer* classified into group A(satisfactory results) and group B(unsatisfactory results) according to comprehensive low back questionnaires from their answer. They were checked with reference to intervertebraL disc height and scoliotic, and lordotic angle with Cobb´s method in the anterioposterior and lateral lumbar spine films before/after operation, and TFC diameter and length were categorized. In group A, 11 cases (55 %) of "excellent" - results and 5 cases(25%) of "good" results were included. In group B, 2 cases (10%) of "fair" results and 2 cases(1016) of "poor" results were included. In the lateral projection of group A and B, the mean preoperative disc height were 9.88 2.69mm and 10.452.39mm.
Twelve months after operation, the mean disc height of group A was significantly increased to 14.112.14mm, but that in group B was not significantly increased only to 11.502.52mm. Preoperatively, the measured scoliotic and lordotic angles between L1 and S1 by Cobb´s method were similar in both groups, being 4.183.58 and 26.75 6.64 degree in the group A, 3.502.65 and 33.2513.10 degree in the group B. Twelve months after operation, the angles for group A were significantly improved to 0 and 48.1311.83 degree, but in group B, not changed into 4.504.79 and 33.75 10.31 degree. The mean diameter and length of TFC in group A were, in each, 15.62 1.09mm and 24.44 2.39mm but, 12.50 1.00mm and 21.00 0.00mm in those of group B. For successful results after TFC interbody fusion in the lower lumbar spine, recovery of narrow disc space, scoliosis, lordosis accompanied by solid arthrodesis were necessary. The authors propose that relatively larger-sized TFC should be profitable for those cases.
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KEYWORD
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lumbar arthrodesis, TFC, intervertebral disc height, scoliotic and lordotic angle
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