Dynamic Cervical Implant (DCI) Versus Anterior Cervical Discectomy And Fusion(ACDF) For The Treatment Of Single-Level Cervical Degenerative Disc Disease (DDD): An RCT

Anterior cervical discectomy and fusion (ACDF) is an effective and safe treatment for patients with radiculopathy and myelopathy. However, in the untreated levels adjacent to a fusion, increased motion and elevated intradiscal pressures have been reported. Some investigators have postulated that these changes may lead to an increased risk of adjacent segment degeneration (ASD). Limitations and problems with ACDF have led some investigators to explore the motion-preserving surgeries, such as cervical total disk replacement (TDR). Although TDR has been shown to reduce adjacent-level intra discal pressures and provide a more physiological overall cervical but also index- and adjacent-level range of motion (ROM) while maintaining sagittal alignment. Recent studies have also highlighted the potential limitations of TDR. Dynamic cervical implant (DCI) is a type of anterior decompression and cervical non-fusion implant that was initially conceived as a method to combine the potential advantages of fusion and TDR. The DCI is intended to provide controlled, limited flexion and extension-the primary motions in the sub axial cervical spine-that is greater than that seen with fusion, but less than that achieved with TDR .