Please assess the completion status of the following clinical trial:

Trial Title: Clinical Outcomes of Lumbar Degenerative Disc Disease in Active-Duty U.S. Service Personnel

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. Degenerative Disc Disease (DDD) in one vertebral level between L3 and S1, where a diagnosis of DDD requires:~   1. Back and/or leg (radicular) pain; and~  2. Radiographic confirmation of any one of the following by CT, MRI, discography, plain film, myelography, and/or flexion/extension films:~   i. Decreased disc height \> 2 mm; ii. Scarring/thickening of annulus fibrosis; iii. Herniated nucleus pulposus; or iv. Vacuum phenomenon.~2. Skeletally mature adult between the ages of 18 and 50 years at time of surgery.~3. Failed at least 6 months of conservative therapy.~4. Oswestry Low Back Pain Disability Questionnaire score ≥ 20/50 (40%) (Interpreted as moderate/severe disability).~5. Psychosocially, mentally and physically able to fully comply with this protocol including adhering to scheduled visits, treatment plan, completing forms, and other study procedures.~6. Plans to remain on active duty for a minimum of two (2) years.~7. Personally signed and dated the informed consent document prior to any study-related procures indicating that the subject has been informed of all pertinent aspects of the study.~Exclusion Criteria:~1. More than one vertebral level to be treated.~2. The involved vertebral endplates dimensionally smaller than 34.5 mm in the medial-lateral direction and/or 27 mm in the anterior-posterior direction.~3. Known allergy to polyethylene, cobalt chromium, or molybdenum~4. Prior fusion surgery at any lumbar vertebral level.~5. Clinically compromised vertebral body at the affected level due to current or past trauma.~6. Radiographic confirmation of facet joint disease or degeneration.~7. Lytic spondylolisthesis or spinal stenosis.~8. Degenerative spondylolisthesis \> Grade 1.~9. Osteoporosis: A screening questionnaire for osteoporosis, SCORE (Simple Calculated Osteoporosis Risk Estimation), will be used to screen patients who require a DEXA bone mineral density measurement. If DEXA is required, exclusion will be defined as a DEXA bone density measured T score \</= -2.5.~10. Known history of Paget's disease, osteomalacia, or any other metabolic bone disease.~11. Morbid obesity defined as a body mass index \> 40 kg/m2 or weight more than 100 pounds over ideal body weight.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 50 Years
- Healthy Volunteers: f

Study Arms:
- ProDisc L (Type: OTHER): None

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