Whithin 4 weeks past of first operation of lumbar disc herniation, weeker scar and little beleeding makes it earsier to dissect and avoid compressed nerve root becoming adhesion and degenerationAuthors considered that: secondary operation should be performed whithin 4 weeks for cases that first operation result was not so good and as earlier as you can for cases that sciatica becomes more sever or cauda equina syndrom oppears.
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