Abstract
Literature about the clinical characteristics of herniation of the lumbar intervertebral disc is profuse. Due to their predominant frequency, attention was almost entirely devoted to the L-4 and L-5 prolapses. As clinical accuracy still remains a very important target, specially in departments where myelography is not used for the diagnosis of this entity, the authors thought it of interest to describe the clinical picture of the L-3-herniated disc. Special stress is placed on the motor involvement. Fourteen cases form this series. They were all central soft herniations. Cases of spondylotic narrow spinal canal were excluded. The special features were their predominance in people above 50 years old and the compromise of the hip abductors and internal rotator muscle groups making it impossible for the patient to stand on the affected limb (Trendelenburg sign). An abnormal knee jerk was a frequent accompaniment. Contrary to common knowledge the quadriceps muscle strength was almost unaffected. Sensory disturbances were not useful for location. The L-3 section of the lower lumbar spine is the narrowest explaining the reason why 3/4 of the patients had a more or less complete cauda equina syndrome. It was therefore a very dangerous herniation that crippled quickly, needing usually an emergency operation with all the risks involved in this older age group of patients.
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