---
title: FLXfitTM 15 TLIF Interbody Fusion Device
nct_id: NCT04208048
overall_status: COMPLETED
sponsor: Rush University Medical Center
study_type: OBSERVATIONAL
primary_condition: Degenerative Disc Disease
countries: United States
canonical_url: "https://parkinsonspathways.com/agent/trials/NCT04208048.md"
clinicaltrials_gov: "https://clinicaltrials.gov/study/NCT04208048"
ct_last_update_post_date: 2023-03-14
last_seen_at: "2026-05-12T06:44:26.017Z"
source: ClinicalTrials.gov (mirrored, no enrichment)
---
# FLXfitTM 15 TLIF Interbody Fusion Device

**Official Title:** Post-market Surveillance Study of FLXfitTM 15 TLIF Interbody Fusion Device

**NCT ID:** [NCT04208048](https://clinicaltrials.gov/study/NCT04208048)

## Key Facts

- **Status:** COMPLETED
- **Study Type:** OBSERVATIONAL
- **Target Enrollment:** 31
- **Lead Sponsor:** Rush University Medical Center
- **Conditions:** Degenerative Disc Disease
- **Start Date:** 2018-10-15
- **Completion Date:** 2022-08-22
- **CT.gov Last Update:** 2023-03-14

## Brief Summary

The purpose of this study is post-market, patient outcome research to evaluate medical device safety and effectiveness. The data collected will assess the safety of the FLXfit 15TM (studydevice) system.

## Detailed Description

The purpose of this study is post-market, patient outcome research to evaluate medical device safety and effectiveness. The data collected will assess the safety of the FLXfit 15TM (study device) system, as measured by the rate of serious operative and post-operative complications. It will also assess the effectiveness as measured by radiographs (X-rays), CT scans, MRI scans, patient-reported, health-related quality of life questionnaires up to (24) months following the procedure, as compared to before surgery.

## Eligibility

- **Minimum age:** 18 Years
- **Maximum age:** 70 Years
- **Sex:** ALL

```
Inclusion Criteria:

* Adult (18-70 y/o)
* Male or Female
* With the following conditions of the lumbar spine as confirmed by advanced imaging (CT or MRI), who is a candidate for primary spinal fusion procedure according to acceptable criteria for such medical conditions:

  * Degenerative disc disease with up to Grade I spondylolisthesis
  * Spondylolisthesis
* Failure of at least 6-months conservative treatment
* BMI \< 40
* Patient to approve no pregnancy during the 24 months of study and no participation in other studies in parallel to this one
* Ability to read, understand, and sign informed consent

Exclusion Criteria:

* Infection, local to the operative site
* Signs of local inflammation
* Fever or leukocytosis
* Pregnancy
* Significant mental disorder or condition that could compromise the patient's ability to remember and comply with preoperative and postoperative instructions (e.g. current treatment for a psychiatric/psychosocial disorder, senile dementia, Alzheimer's disease, traumatic head injury)
* Prior surgical procedure (with the exception of decompression only procedure) at the index level(s) using the desired operative approach
* Prior fusion procedure at an adjacent level
* Any other condition which would preclude the potential benefit of spinal implant surgery, such as the presence of tumors or congenital abnormalities, fracture local to the operating site, elevation of segmentation rate unexplained by other diseases, elevation of white blood count (WBC), or a marked left shift in the WBC differential count
* Neuromuscular disorder that would engender unacceptable risk of instability, implant fixation failure, or complications in postoperative care
* Active local infection in or near the operative region
* Active systemic infection and/or disease
* Severe osteoporosis or insufficient bone density, which in the medical opinion of the physician precludes surgery or contraindicates instrumentation
* Endocrine or metabolic disorders known to affect osteogenesis (e.g. Paget's disease, renal osteodystrophy, hypothyroidism)
* Systemic disease that requires the chronic administration of nonsteroidal anti- inflammatory or steroidal drugs
* Suspected or documented allergy or intolerance to implant's materials
* Symptomatic cardiac disease
* Patient unwilling to cooperate with postoperative instructions.
* Any case where the implant components selected for use would be too large or too small to achieve a successful result.
* Patient having inadequate tissue coverage over the operative site or inadequate bone stock or quality.
* Any patient in which implant utilization would interfere with anatomical structures or expected physiological performance.
* Prior fusion at the level to be treated.
* Back VAS \< 4/10
```

## Arms

- **FLXfit 15** — The FLXfit 15 device will then be placed into the space between the low backbones, using specific medical instruments, where the damaged disc was removed.

## Interventions

- **FLXfit 15TM device** (DEVICE) — In order to implant the FLXfit 15TM device properly, your study doctor will first prepare the space between the low back bones (vertebrae) and then remove your damaged disc. The FLXfit 15TM device will then be placed into the space between the low backbones, using specific medical instruments, where the damaged disc was removed.

## Primary Outcomes

- **Fusion** _(time frame: through study completion; 2 year)_ — Did patient achieve fusion?
- **Visual Analogue Pain Scale: Back** _(time frame: 6-week)_ — 0 to 10 score; higher score means worse pain
- **Visual Analogue Pain Scale: Back** _(time frame: 12- week)_ — 0 to 10 score; higher score means worse pain
- **Visual Analogue Pain Scale: Back** _(time frame: 6-month)_ — 0 to 10 score; higher score means worse pain
- **Visual Analogue Pain Scale: Back** _(time frame: 1-year)_ — 0 to 10 score; higher score means worse pain
- **Visual Analogue Pain Scale: Back** _(time frame: 2-year)_ — 0 to 10 score; higher score means worse pain
- **Visual Analogue Pain Scale: Leg** _(time frame: 6-week)_ — 0 to 10 score; higher score means worse pain
- **Visual Analogue Pain Scale: Leg** _(time frame: 12- week)_ — 0 to 10 score; higher score means worse pain
- **Visual Analogue Pain Scale: Leg** _(time frame: 6-month)_ — 0 to 10 score; higher score means worse pain
- **Visual Analogue Pain Scale: Leg** _(time frame: 1-year)_ — 0 to 10 score; higher score means worse pain
- **Visual Analogue Pain Scale: Leg** _(time frame: 2-year)_ — 0 to 10 score; higher score means worse pain
- **Oswestry Disability Index** _(time frame: 6-week)_ — 0 to 100 score; higher score means greater patient disability
- **Oswestry Disability Index** _(time frame: 12- week)_ — 0 to 100 score; higher score means greater patient disability
- **Oswestry Disability Index** _(time frame: 6-month)_ — 0 to 100 score; higher score means greater patient disability
- **Oswestry Disability Index** _(time frame: 1-year)_ — 0 to 100 score; higher score means greater patient disability
- **Oswestry Disability Index** _(time frame: 2-year)_ — 0 to 100 score; higher score means greater patient disability
- **Short Form-12 Health Survey** _(time frame: 6-week)_ — 0 to 100 score; higher score means less patient disability
- **Short Form-12 Health Survey** _(time frame: 12-week)_ — 0 to 100 score; higher score means less patient disability
- **Short Form-12 Health Survey** _(time frame: 6-month)_ — 0 to 100 score; higher score means less patient disability
- **Short Form-12 Health Survey** _(time frame: 1-year)_ — 0 to 100 score; higher score means less patient disability
- **Short Form-12 Health Survey** _(time frame: 2-year)_ — 0 to 100 score; higher score means less patient disability
- **Patient Reported Outcomes Measurement Information System (PROMIS)** _(time frame: 6-week)_ — 20 to 80 score; higher score means higher reported self-capability
- **Patient Reported Outcomes Measurement Information System (PROMIS)** _(time frame: 12- week)_ — 20 to 80 score; higher score means higher reported self-capability
- **Patient Reported Outcomes Measurement Information System (PROMIS)** _(time frame: 6-month)_ — 20 to 80 score; higher score means higher reported self-capability
- **Patient Reported Outcomes Measurement Information System (PROMIS)** _(time frame: 1-year)_ — 20 to 80 score; higher score means higher reported self-capability
- **Patient Reported Outcomes Measurement Information System (PROMIS)** _(time frame: 2-year)_ — 20 to 80 score; higher score means higher reported self-capability

## Locations (1)

- Rush University Medical Center, Chicago, Illinois, United States

## Recent Field Changes (last 30 days)

- `status.overallStatus` — added _(2026-05-12)_
- `status.primaryCompletionDate` — added _(2026-05-12)_
- `status.completionDate` — added _(2026-05-12)_
- `status.lastUpdatePostDate` — added _(2026-05-12)_
- `design.enrollmentCount` — added _(2026-05-12)_
- `eligibility.criteria` — added _(2026-05-12)_
- `eligibility.minAge` — added _(2026-05-12)_
- `eligibility.maxAge` — added _(2026-05-12)_
- `eligibility.sex` — added _(2026-05-12)_
- `outcomes.primary` — added _(2026-05-12)_
- `armsInterventions.arms` — added _(2026-05-12)_
- `armsInterventions.interventions` — added _(2026-05-12)_
- `sponsor.lead` — added _(2026-05-12)_
- `results.hasResults` — added _(2026-05-12)_
- `locations.rush university medical center|chicago|illinois|united states` — added _(2026-05-12)_

---

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*Source data (authoritative): https://clinicaltrials.gov/study/NCT04208048*  
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