Clinical trial Recruiting at 9 sites Observational

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.

More Scoliosis Idiopathic trials

Quick facts

Study typeObservational
SexAll
Enrollment200 (estimated)
SponsorZimVie
Industry-sponsored
Locations10 sites (San Diego, California and 9 other locations)
StatusRecruiting
StartedOctober 29, 2020
Main results expectedAugust 31, 2027
Study endsDecember 31, 2027
Registry record updatedFebruary 22, 2024
Trial IDNCT04505579 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

  • 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
  • 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

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.