The ratio of fused area of local bone inside cages at regions exposed to endplates was <50%, which is insufficient for physiologic load transmission. The authors recommend that additional bone should be grafted into the disc space or new bone bonding interbody spacer should be considered.
Patients' satisfaction was not as high as expected after fusion for LDD. Therefore, the decision for performing a lumbar fusion in those patients must be done more carefully, and it should be explained more precisely that chronic pain may persist after spinal surgery.
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