[Early effectiveness of cervical disc replacement by using Pretic-I].

This is the authors' abstract. We don't add key points for this paper.

Objective: To observe the early effectiveness of cervical disc replacement with Pretic-I, a new type artificial disc. Methods: level in 1 case. The visual analogue scale (VAS), Japanese Orthopaedic Association (JOA) score, and neck disability index (NDI) were used to evaluate the clinical outcomes. Besides, the disc height and the range of motion (ROM) at operated level, and ROM of upper and lower adjacent level were measured to assess the function. Conclusion: The early effctiveness of cervical disc replacement using Pretic-I is satisfactory. The symptoms can be relieved significantly and the dynamic features of the operated level, as well as the upper and lower adjacent levels, are well preserved.