Post-approval assessment of The Tether system for treating scoliosis
Official title: The Tether™ - Vertebral Body Tethering System Post Approval Study
Run by ZimVie · NCT04505579 · Data updated 2026-11-12
This study is looking at how well The Tether system works and its safety for kids with scoliosis who have had this treatment to help straighten their spines as they grow.
Quick facts
| Study type | Observational |
|---|---|
| Sex | All |
| Enrollment | 200 (estimated) |
| Sponsor | ZimVie Industry-sponsored |
| Locations | 10 sites (San Diego, California and 9 other locations) |
| Status | Recruiting |
| Started | October 29, 2020 |
| Main results expected | August 31, 2027 |
| Study ends | December 31, 2027 |
| Registry record updated | February 22, 2024 |
| Trial ID | NCT04505579 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Ideal candidates for this study are skeletally immature individuals diagnosed with progressive idiopathic scoliosis and a major Cobb angle between 30° and 65°.
✕Probably not a fit
Patients with prior spinal surgery at the treatment levels or those with systemic infections or poor bone quality may not benefit from this study.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This observational study aims to provide ongoing safety and efficacy data for The Tether HUD, a device used in Anterior Vertebral Body Tethering (AVBT) for treating progressive idiopathic scoliosis in skeletally immature patients. The study will collect long-term outcomes from patients who have undergone AVBT, which utilizes growth modulation techniques to correct spinal curvature while preserving flexibility. By monitoring these patients, the study seeks to ensure the continued safety and probable benefits of this innovative treatment approach.
Why it matters
Potential benefit: If successful, this study could provide valuable insights into the long-term safety and effectiveness of AVBT, potentially improving treatment options for scoliosis patients.
How similar studies have gone: Other studies have explored growth-modulation techniques for scoliosis treatment, indicating a promising avenue for further investigation, although this specific approach is relatively novel.
Who can join: the full rules
Show full inclusion / exclusion criteria
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
Where it's running
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Rady Children's Hospital
San Diego, California, United States Recruiting -
Children's Hospital Colorado
Aurora, Colorado, United States Recruiting -
Children's Healthcare of Atlanta
Atlanta, Georgia, United States Recruiting -
Ochsner Health
New Orleans, Louisiana, United States Recruiting -
Mayo Clinic
Rochester, Minnesota, United States Recruiting -
University of Missouri - Columbia
Columbia, Missouri, United States Recruiting
Show 4 more locations
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Mount Sinai
New York, New York, United States Recruiting -
Shriners Children's Hopital
Philadelphia, Pennsylvania, United States Recruiting -
Seattle Children's
Seattle, Washington, United States Recruiting -
Nemours Children's Health
Jacksonville, Florida, United States Active not recruiting
Study contacts
- Study coordinator: Monica Barascout, BS
- Email: Monica.Barascout@zimvie.com
- Phone: 1-303-465-8960
Similar studies
Other studies for the same condition or treatment. Recruiting studies are listed first.
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TXA in kids undergoing scoliosis surgery
This trial tests whether tranexamic acid can reduce blood loss and the need for transfusions in children aged 10–18 having surgery for idiopathic scoliosis.
-
Post-market follow-up of the NEMOST V2 spinal implant
This project will try the NEMOST V2 growing domino in children aged 5–17 with progressive scoliosis to track safety and device performance over five years.
-
Diffusion in the growing spine: ADC of the intervertebral disc in children
This study tests whether MRI diffusion measurements in the intervertebral disc can help understand differences between scoliotic and healthy children.
-
Breathing muscle training for children and teens with idiopathic scoliosis during Schroth therapy
This project will see if adding inspiratory muscle training to Schroth therapy helps 11–16-year-olds with idiopathic scoliosis breathe better, tolerate exercise more, and strengthen their core.
-
High-resolution MRI of paravertebral (back) muscles in children with idiopathic or neuromuscular scoliosis
We will use a short, extra high-resolution MRI to see if differences in the deep back muscles are linked to scoliosis in children aged 10–17 with idiopathic or neuromuscular forms.
-
Schroth method with and without core stabilization exercises for adolescents with idiopathic scoliosis
This trial tests whether adding core stabilization exercises to the Schroth method helps teens (ages 10–18) with mild idiopathic scoliosis reduce spinal curve, build back endurance, increase chest mobility, and improve quality of life.
How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.