Comparison of Software-assisted Implantation of Elastic Spine Pad (TM) With Respect to Postoperative Change in Neck Disability Index (NDI) With the Conventional Disc Prosthesis Rotaio (TM) After Anterior Cervical Discectomy for Cervical Disc Prolapse
Comparison of Software-assisted Implantation of Elastic Spine Pad (TM) With Respect to Postoperative Change in Neck Disability Index (NDI) With the Conventional Disc Prosthesis Rotaio (TM) After Anterior Cervical Discectomy for Cervical Disc Prolapse
This is an investigator-initiated study. The primary goal is to evaluate the efficacy of two
 different cervical disc prosthetic devices with respect to postoperative change in neck
 disability index. The evaluation will include clinical and radiological parameters.
Inclusion Criteria:

 -  Indication for monosegmental anterior cervical discectomy with implantation of a disc
 prosthesis

 Exclusion Criteria:

 -  Radiologic signs of extensive bone degeneration in the affected segment

 -  Necessity of implantation of a device smaller in height than 5 mm (as predicted with
 teh use of the Vertaplan (TM) software

 -  Transversal spine cord lesion

 -  Cervical myelopathy

 -  Preceding surgery on the cervical spine

 -  Traumatic lesions of the cervical spine

 -  Radiographic instability in the affected segment: flexion / extension: shift sagittal
 plane> 3.5 mm or 20% and rotation in the sagittal plane > 20 °, OR in static X-ray
 examinations: shift in the sagittal plane 3.5 mm or 20% of the vertebral body width
 and relative sagittal plane angulation > 11º

 -  signs of instability (Olisthesis) in another segment of the cervical spine

 -  Active systemic infection

 -  diseases of the rheumatic type and all autoimmune diseases

 -  bone metabolic diseases (for example, Paget's disease)

 -  skeletal metastases

 -  infections in the cervical spine

 -  Neurological seizure disorders or other serious neurological disease with risk of
 falls

 -  Severe heart failure (NYHA III-IV)

 -  Bleeding disorders or clopidogrel / coumarins - treatment

 -  Systemic use of corticosteroids for more than a month in the last 12 months

 -  Pregnancy

 -  Legally incompetent patient

 -  Lactation

 -  Deformity, anomalies, not fully developed skeleton

 -  Local tumor disease

 -  Pre-existing neurologic abnormalities or other shortcomings, such as a Parkinson's
 disease, diabetic neuropathy, multiple sclerosis, peripheral neuropathy

 -  Drug / drug or alcohol dependence