Fig. 3

 A 56-year-old female patient was admitted to the hospital due to low back pain with left lower limb pain and numbness for 5 years, which had been aggravated for 1 week. Lumbar decompression and interbody fusion were performed through the left intervertebral foramen of L4 and 5, and no preventive decompression was performed on the right side. On the fifth day after the operation, the patient had grade 2 right ankle dorsiflexion muscle strength, grade 1 right hallux dorsiflexion muscle strength, and shallow sensation of the right hallux toe skin. The symptoms were not significantly improved after dehydration and conservative treatment. Subsequently, lumbar CT and MRI examinations were performed. Considering the dislocation of the right superior articular process of the lower vertebral body, emergency nerve root release was performed, and postoperative recovery was acceptable. 3a, L4/5 bilateral intervertebral foramen severe stenosis; 3b,3c, Lumbar decompression and interbody fusion was performed through the left intervertebral foramen of L4/5, and no preventive decompression was performed on the right side during the operation; 3d, After the operation, the symptoms of right intervertebral foramen stenosis occurred, and nerve root release was performed. The right inferior articular process of L4 and the right superior articular process of L5 were removed with bite forceps