Turkish Neurosurgery 2016 , Vol 26 , Num 2
Dynamic Radiographic Results of Different Semi-Rigid Fusion Devices for Degenerative Lumbar Spondylolisthesis: "Dynamic Rod" vs. "Dynamic Screw Head"
Jin Seo YANG, Yong Jun CHO, Suk Hyung KANG, Hyuk Jai CHOI
Hallym University, College of Medicine, Spine Center, Chuncheon Sacred Heart Hospital, Department of Neurosurgery, Chuncheon, Korea DOI : 10.5137/1019-5149.JTN.9784-13.1 AIM: To assess the clinical outcomes and compare the segmental range of motion (ROM) at the implanted L4-L5 level, the cranial and caudal adjacent levels, and the ROM of the whole lumbar spine after semi-rigid lumbar fusion with 2 different devices.

MATERIAL and METHODS: Patients with neurogenic claudication, due to grade 1 spondylolisthesis and spinal stenosis at levels L4-L5, were treated either Bio-flex (n = 28) and Cosmic (n = 23); discectomy was not performed at any level. The clinical outcomes were compared between the 2 groups. All patients underwent neutral, flexion, and extension radiography before the surgery and after 2 years postoperatively. ROM was assessed at the level of L4-L5, L3-L4, L5-S1, and at the whole lumbar spine.

RESULTS: According to clinical outcomes, 82% and 78% of patients in the BioFlex and Cosmic groups, respectively, had a good or excellent result. In both groups, there was significant reduction of the segmental ROM at the implanted L4-L5 level (p = 0.039 and 0.011).

CONCLUSION: These outcomes may play a role in decreasing the risk of ASD after dynamic stabilization, at least 2 years after surgery. Keywords : Adjacent segment disease, Adjacent segment degeneration, Bioflex, Cosmic, Dynamic stabilization, Lumbar fusion surgery

Corresponding author : Yong Jun Cho, nssur771@hallym.or.kr