Abstract
The radiological features of the severe loss of the disc height of the lumbar spine with reference to reduced movement were studied in 85 cases of L5/S1 disc resorption (average 57 years old) and compared with 108 cases (average 45 years old) of lumbar disc lesion.The degree of movement of the disc was measured from the lateral view of the extension and flexion radiographs.The average range of movement was 7.05 degrees in the L5/S1 disc resorption group (DS) and 8.9 degrees in the control group (DLG). Slight reduction of movement was seen but there were no statistical correlation between the two. In isthmic spondylolisthesis cases and retro-spondylolisthesis cases of the DS group, reduction of movement was not proved. On the contrary, considerable reduction of movement was demonstrated for degenerative spondylolisthesis.Movement below 4 degrees was more frequent in the DS group (28%) than the DL group (18%).It proved to be more frequent for degenerative spondylolisthesis than other groups in DS group.In conclusion, the existence of severe loss of disc height showed no correlation with the reduction of movement, but the reduction of movement was more predominart in degenerative spondylolisthesis than other spondylolisthesis.
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