Please assess the completion status of the following clinical trial:

Trial Title: AccuLIF® PROSPECTIVE PATIENT OUTCOMES STUDY

Study Design Characteristics:
- Allocation: None
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: None
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~1. Subject is skeletally mature and between 18 and 70 years of age.~2. DDD and up to Grade I spondylolisthesis or retrolisthesis, requiring decompression and arthrodesis at one or two contiguous levels between L2 and S1.~3. No previous surgery at the same or adjacent level (other than microdiscectomy / laminectomy) at the same or adjacent level.~4. Non-responsive to conservative (non-surgical) treatment for back pain for a minimum of 6 months.~5. Subject understands the conditions of enrollment and is willing to sign and date the Informed Consent.~6. Subject agrees to comply with visit schedule and completing study questionnaires.~Exclusion Criteria:~1. Significant instability of the spine.~2. Requires TLIF at more than 2 levels between L2 and S1.~3. Previously undergone lumbar spine surgery (other than microdiscectomy / laminectomy) at the same or adjacent level.~4. Younger than 18 years of age, or older than 70 years of age.~5. BMI of 40 or greater.~6. History of metabolic bone disease~7. Osteoporosis~8. Diabetes mellitus requiring daily insulin management.~9. Subject has any of the following:~   1. Progressive neuromuscular disease; OR~  2. Autoimmune disease; OR~  3. Active malignancy within the last 15 years; OR~  4. Active hepatitis; OR~  5. AIDS, ARC, or is HIV positive; OR~  6. Syringomyelia at any spinal level; OR~  7. Any other condition that would interfere with the subject self -assessment of pain, function or quality of life.~10. Allergy to implant materials (titanium, titanium alloy).~11. Active systemic infection or infection localized to the site of implantation.~12. Primary or metastatic tumors involving the spine.~13. Open wounds or inadequate issue tissue coverage over the operative site.~14. History of significant mental illness or mental incapacity.~15. Pregnancy or intent to become pregnant.~16. Participating in another investigational study for a similar purpose.~17. Belongs to a vulnerable population that would compromise ability to provide informed consent or compliance with follow-up requirements.~18. Smokers unwilling to cease up to 3 months post-op or recent history of alcohol or other substance abuse within the past 2 years.~19. Workers compensation.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 70 Years
- Healthy Volunteers: f

Study Arms:
- AccuLIF (Type: EXPERIMENTAL): None

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