Abstract
We experienced 134 cases of surgically treated lumbar disc herniation within the past seven years. Six of these cases, all males, showed lateral lumbar disc herniation. We studied these cases with regard to involved levels in the sagittal plane and localization in the horizontal plane, surgical procedure and postoperative improvement. The average age at the time of surgery was 44.2 years old, with a range between 27 and 62 years. The average follow-up period was 2 years with a range from 8 months to 3 years and 8 months. The level was L3/4 in one case, L4/5 in two cases, L5/S in three cases. Localization of herniation in the horizontal plane was extraforaminal in five cases, and intraforaminal herniation associated with L5 spondylolysis was seen in one case. In the former five cases, we performed resection of herniated discs following lateral fenestration, and in the other case herniated disc was removed after Gill's method, followed by posterolateral fixation Clinical symptoms improved in all cases after surgery. The mean Japanese Orthopaedic Association (JOA) scores of lumbar spine before surgery were 13 out of 29 points and after surgery were 26 points. The mean improvement rate was 60 percent.
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