This table shows that the median
and posterolateral hernias were predominant in the proportions of 50% and
53.1%, respectively.
Nuclear Magnetic Resonance Imaging
Among 160 patients, 48 (30.0%) patients had an MRI examination
in addition to CT. Figure 2 below shows the distribution. Among these 48
patients, 47.9% had posterolateral DH, 33.3% had a median DH, and 18.8% had a
foraminal hernia.
Figure 2. Distribution of MRI findings of the lumbar spine.
This figure confirms once again that the foraminal subtype is
rare, as in the CT scan.
ANATOMICAL AND TOPOGRAPHIC DISTRIBUTION OF LESIONS
Table XVI below illustrates the distribution according
to the number and disc level concerned.
Table XVI. Distribution of patients by number and level
of disc level affected
|
Number of discfloors
|
Level of disc floors
|
Number of patients
|
%
|
|
Unique
|
L4 - L5
|
55
|
34,4
|
|
L5 - S1
|
35
|
21,9
|
|
Total
|
90
|
56,3
|
|
Double
|
L3 - L4, L4 - L5
|
10
|
6,3
|
|
L4 - L5, L5 - S1
|
45
|
28,1
|
|
Total
|
55
|
34,4
|
|
Triple
|
L3 - L4, L4 - L5, L5 - S1
|
15
|
9,4
|
| 
