Please assess the completion status of the following clinical trial:

Trial Title: Longevity, Functional Status and Quality of Life of the Compress® Compliant Pre-Stress System

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

Eligibility Criteria:
Inclusion Criteria:~* Patients are/will be operated from 26/08/1999 onwards in UZ Leuven~* Implantation of the Compress Compliant Pre-Stress Device~* Informed consent obtained~* Patients are able to complete the questionnaires~* Age: minimum 7 years old~Exclusion Criteria:~* N/A

- Gender: ALL
- Minimum Age: 7 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- Prospective group (Type: OTHER): Patients who have to undergone the implant surgery
- Retrospective group (Type: OTHER): Patients that have already undergone the implant surgery

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