- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04505579
The Tether™ - Vertebral Body Tethering System Post Approval Study
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
While spinal fusion remains the standard surgical treatment for progressive idiopathic scoliosis, concerns about the long-term effects of spinal fusion have led to the investigation of growth-modulation techniques. Anterior Vertebral Body Tethering (AVBT) is one such technique that utilizes growth modulation to remodel the shape of the vertebra and straighten scoliotic curves in skeletally immature individuals. In this technique, screws are inserted at each vertebral level for the length of the convex side of the curve. A strong cord is connected through the screw tulip heads and used to initially straighten the curve as each level is fixed with a set screw. Following surgery and during the growth period the spine begins to remodel according to the Hueter-Volkmann Law, bone growth is relatively inhibited in areas of increased pressure (convex or tethered side) and relatively stimulated in areas of decreased pressure or tension (concave side). Following this principle, AVBT has been shown to alter spinal growth with the potential to correct scoliosis while maintaining spine flexibility.
The objective of the study is to assess the ongoing safety and probable benefit of The Tether HUD which was approved by the FDA under an HDE. Subject enrollment and data collection will be managed by the Harms Study Group (HSG) and Setting Scoliosis Straight Foundation (SSSF) Registry. Institutions that are HSG members or affiliates, with Investigators/surgeons that are trained and approved to perform surgeries with The Tether, will participate in the registry. Ten sites from this group will be identified as study sites specific to this Tether post-approval study (PAS). Consecutive subjects from these sites, that meet the eligibility criteria of this study, will be flagged in the registry as the PAS cohort and the study endpoints will be assessed across this population.
Study Type
Enrollment (Estimated)
Contacts and Locations
Study Contact
- Name: Monica Barascout, BS
- Phone Number: 1-303-465-8960
- Email: Monica.Barascout@zimvie.com
Study Contact Backup
- Name: Kim Martinez
- Phone Number: 1-303-465-8960
- Email: Kim.Martinez@zimvie.com
Study Locations
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California
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San Diego, California, United States, 92123
- Recruiting
- Rady Children's Hospital
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Contact:
- Peter O Newton, MD
- Phone Number: 858-966-6789
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Colorado
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Aurora, Colorado, United States, 80045
- Recruiting
- Children's Hospital Colorado
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Contact:
- Mark Erickson, MD
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Florida
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Jacksonville, Florida, United States, 32207
- Active, not recruiting
- Nemours Children's Health
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Georgia
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Atlanta, Georgia, United States, 30342
- Recruiting
- Children's Healthcare of Atlanta
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Contact:
- Joshua Murphy, MD
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Louisiana
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New Orleans, Louisiana, United States, 70121
- Recruiting
- Ochsner Health
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Contact:
- Lawrence Haber, MD
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Minnesota
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Rochester, Minnesota, United States, 55905
- Recruiting
- Mayo Clinic
-
Contact:
- A. Noelle Larson, MD
- Phone Number: 507-284-3660
- Email: Larson.noelle@mayo.edu
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Missouri
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Columbia, Missouri, United States, 65201
- Recruiting
- University of Missouri - Columbia
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Contact:
- Daniel Hoernschemeyer, MD
- Phone Number: 573-882-2663
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New York
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New York, New York, United States, 10029
- Recruiting
- Mount Sinai
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Contact:
- Baron Lonner, MD
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Pennsylvania
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Philadelphia, Pennsylvania, United States, 19140
- Recruiting
- Shriners Children's Hopital
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Contact:
- Amer F Samdani
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Washington
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Seattle, Washington, United States, 98105
- Recruiting
- Seattle Children's
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Contact:
- Burt Yaszay, MD
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
- Child
- Adult
- Older Adult
Accepts Healthy Volunteers
Sampling Method
Study Population
Description
Inclusion Criteria:
- Diagnosis of progressive idiopathic scoliosis
- Skeletally immature, based on both Risser (<5) and Sanders (<8) assessments
- Major Cobb angle ≥30° and ≤65°
- Osseous structure dimensionally adequate to accommodate screw fixation, as determined by radiographic imaging
- Failed or intolerant to bracing
Exclusion Criteria:
- Presence of any systemic infection, local infection, or skin compromise at the surgical site
- Prior spinal surgery at the level(s) to be treated
- Documented poor bone quality, defined as a T-score -1.5 or less
- Any other medical or surgical condition which would preclude the potential benefit of spinal surgery, such as coagulation disorders, allergies to the implant materials, and patient's unwillingness or inability to cooperate with post-operative care instructions
- Unwillingness, inability, or living situation (e.g. custody arrangements, homelessness, detention) that would preclude ability to return to the study site for follow-up visits as described in protocol and Informed Consent
- Unwillingness to sign Informed Consent Form and participate in study procedures
Study Plan
How is the study designed?
Design Details
- Observational Models: Cohort
- Time Perspectives: Prospective
Cohorts and Interventions
Group / Cohort |
Intervention / Treatment |
---|---|
Tether
Patients who have received The Tether HUD for treatment of idiopathic scoliosis.
|
Anterior Vertebral Body Tethering (AVBT) is a technique that utilizes growth modulation to remodel the shape of the vertebra and straighten scoliotic curves in skeletally immature individuals.
In this technique, screws are inserted at each vertebral level for the length of the convex side of the curve.
A strong cord is connected through the screw tulip heads and used to initially straighten the curve as each level is fixed with a set screw.
Following surgery and during the growth period the spine begins to remodel according to the Hueter-Volkmann Law, bone growth is relatively inhibited in areas of increased pressure (convex or tethered side) and relatively stimulated in areas of decreased pressure or tension (concave side).
Other Names:
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Rate of SAEs and device- &/or procedure-related AEs
Time Frame: AVBT surgery to five year post-op
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The primary safety endpoint is the rate of Serious Adverse Events (SAEs) and device- and/or procedure-related Adverse Events (AEs)
|
AVBT surgery to five year post-op
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Percentage of subjects with maintenance of the major Cobb angle less than or equal to 40 degrees at 60 months post-surgery
Time Frame: AVBT surgery to five year post-op
|
The primary probable benefit endpoint is the percentage of patients with maintenance of the major Cobb angle less than or equal to 40 degrees at 60 months post-surgery
|
AVBT surgery to five year post-op
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Adverse Events
Time Frame: AVBT surgery to five year post-op
|
Rates of overall Adverse Events; relatedness, severity, time to event
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AVBT surgery to five year post-op
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Reoperation
Time Frame: AVBT surgery to five year post-op
|
Rates and types of reoperation
|
AVBT surgery to five year post-op
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Number of participants with new curves that develop above or below the tethered portion of the spine.
Time Frame: AVBT surgery to five year post-op
|
Determined by radiographic assessment, defined as a new curve development with Cobb angle measurement greater than or equal to 40 degrees.
|
AVBT surgery to five year post-op
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Number of participants with secondary curves that progress to the point of clinical significance.
Time Frame: AVBT surgery to five year post-op
|
Determined by radiographic assessment, typically defined as an increase in secondary Cobb angle measurement greater than or equal to 10 degrees, or medical intervention/ intent to treat.
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AVBT surgery to five year post-op
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Number of participants with device integrity failures including cord breakage and screw migration.
Time Frame: AVBT surgery to five year post-op
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AVBT surgery to five year post-op
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Mean (SD) and distributions of sagittal balance (mm) from pre-op through last visit
Time Frame: Baseline to five year post-op
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Sagittal balance is assessed on the lateral radiograph by measuring the difference (i.e.
distance) between posterosuperior aspect of the S1 vertebral body and the plumb line.
|
Baseline to five year post-op
|
Mean (SD) and distributions of lumbar lordosis (degrees) from pre-op through last visit.
Time Frame: Baseline to five year post-op
|
Lumbar lordosis is defined as the angle at the intersection of lines perpendicular to lines parallel to the superior endplate of T12 and the superior endplate of S1.
|
Baseline to five year post-op
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Mean score of Scoliosis Research Society 22r Patient Questionnaire
Time Frame: Baseline to five year post-op
|
Self-reported outcomes of function, pain, self-image, mental health, and satisfaction.
Mean score; 5 (Best) - 1 (Worst)
|
Baseline to five year post-op
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Number of participants with compromised lung function
Time Frame: Baseline to five year post-op
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Comparison of the measured lung function (forced expiratory volume (FEV1), forced vital capacity (FVC) and FEV1/FVC) to predicted values, lower and upper limits of normal to determine if lung function is within the limits of the normal population.
|
Baseline to five year post-op
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Measurement (degrees rotation) of trunk shape by scoliometer device. Mean (SD) [min, max] will be reported.
Time Frame: Baseline to five year post-op
|
Measurements of trunk shape or rib hump will be collected preoperatively and at each follow-up visit.
A standard scoliometer device will be used to measure the rib hump in the thoracic and/or lumbar regions of the spine, as applicable.
The scoliometer is laid across the curve at right angles with the 0° mark at the spinous process and resting gently on the skin, not pressed down.
The degrees of rotation are read and recorded.
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Baseline to five year post-op
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Trunk flexibility as determined by distance (cm) of flexion and lateral bend using fingertip to floor method.
Time Frame: Baseline to five year post-op
|
Baseline to five year post-op
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Collaborators and Investigators
Sponsor
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Estimated)
Study Completion (Estimated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Estimated)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- RAU2019-40S
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
product manufactured in and exported from the U.S.
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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