Contraindications after lumbar spine surgery include keeping a position for a long time, not exercising the muscles of the lower limbs, and exercising too early. 1. Keeping a position for a long time: when patients keep a position for a long time, it can lead to the formation of decubitus ulcers due to the prolonged pressure on the same body part, and can also lead to pneumonitis. 2. Not exercising the muscles of the lower limbs: After lumbar spine surgery, patients need to stay in bed, and when they stay in bed for too long without exercising the muscles of the lower limbs, it can lead to the formation of thrombus in the deep veins of the lower limbs, which can lead to life-threatening situations such as pulmonary embolism. 3. Premature exercise: premature exercise after lumbar spine surgery can lead to poor healing of the lumbar vertebrae, intervertebral discs and other tissues, redness and swelling of the surgical incision, oozing and so on.