Six steel nails in lumbar disc herniation surgery mainly affect the body with stress masking effect, inability to do MRI, damage to the spinal cord and nerves. 1. Stress masking effect: the stress masking effect is because the stiffness of the steel nails is greater than the stiffness of the bone tissue, so the steel nails are subjected to greater force than the bone tissue, which is equivalent to the bone tissue does not work, and ultimately lead to secondary osteoporosis. 2. Inability to do MRI: MRI can produce a thermogenic effect, if there is a steel nail in the body, can cause the body of the steel nail heat, thereby damaging the human tissue. In addition, MRI can produce a strong magnetic field, which can attract the steel nails in the body, causing the steel nails to shift and other serious consequences. 3. Damage to the spinal cord and nerves: If the nail is poorly placed, it may damage the spinal cord and nerves, causing neuralgia, leg numbness and other negative consequences. Lumbar disc herniation surgery with six steel nails may have other effects on the body, it is recommended to follow the postoperative medical advice, if there are uncomfortable symptoms, it is recommended to go to the hospital in a timely manner, early formal treatment and therapy.