Please assess the completion status of the following clinical trial:

Trial Title: ROMEO®2 PAD. 2 YEARS PROSPECTIVE FOLLOW-UP

Study Design Characteristics:
- Allocation: None
- Intervention Model: None
- Observational Model: COHORT
- Primary Purpose: None
- Time Perspective: PROSPECTIVE
- Masking: None
- Phase: None
- Number of Arms: None

Eligibility Criteria:
Inclusion Criteria:~Surgical treatment of stenosis and Grade I degenerative spondylolisthesis, secondary to lumbar degenerative disc disease at one level between L1 and L5 in skeletally mature patients~Exclusion Criteria:~* Vertebral traumatic lesions including dislocation;~* Insufficient vertebral body bone quality;~* Severe osteoporosis;~* Bone tumor in the region of the implant;~* Spondylolysis;~* Lytic spondylolisthesis;~* Degenerative spondylolisthesis Grade II or more;~* Mental illness or inadequate patient activity;~* Infection;~* Vascular disorders or illness;~* Pregnancy

- Gender: ALL
- Minimum Age: 21 Years
- Maximum Age: 85 Years
- Healthy Volunteers: f

Based on this trial design, predict the completion outcome and termination type (if applicable).