Please assess the completion status of the following clinical trial:

Trial Title: Study on the Treatment of Degenerative Lumbar Spine Stenosis With a Percutaneous Interspinous Implant

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE4
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~1. Male or female over 50 years of age~2. One, two, or three segment degenerative lumbar spinal stenosis (DLSS)~3. Symptoms of radiographically confirmed DLSS like leg, buttock, or groin pain with or without back pain and absence of a peripheral motoric deficit~4. Pain relief in inclination or sitting~5. Ability to walk over a distance of 50 m~6. Unsuccessful conservative therapy for 3 months under outpatient conditions~7. Informed consent~Exclusion Criteria:~1. Fixed motoric deficit~2. Cauda equina syndrome~3. Previous surgery of the lumbar spine~4. Severe osteoporosis of the vertebrae and/or of the hip~5. Spondylolisthesis more severe than Meyerding I (on scale of I-IV)~6. Metastasis of the vertebrae~7. Mentally disabled persons

- Gender: ALL
- Minimum Age: 50 Years
- Maximum Age: 99 Years
- Healthy Volunteers: f

Study Arms:
- Spacer (Type: EXPERIMENTAL): Implantation of a percutaneously implanted interspinous device (spacer)
- physiotherapy (Type: OTHER): The control group will receive at least physiotherapy and physical therapy (e.g. massage and fango). Under inpatient conditions therapy will last for seven days. After discharge physical therapy has to be continued for 5 weeks. A schedule will ensure the consistency of the physical therapy. The inpatient-treatment can be repeated every 6 months if necessary.

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