Safety and Efficacy Study of Spinal Tethering

• Conditions: Adolescent Idiopathic Scoliosis
• Interventions: Device: The Spinal Tethering System

• Registration Number: NCT02897453
• Lead Sponsor: Zimmer Biomet

Brief Summary

This study is an opportunity to gather long term safety and efficacy information from patients who have had their scoliosis treated via anterior vertebral body tethering (VBT).

Detailed Description

Participants in this study will have already been implanted with a vertebral body tethering device. Patients will be recruited for prospective follow-up to enable systematic data capture from the point of study entry to their 18th birth year and skeletal maturity. Over the course of their follow-up clinical outcomes, patient reported outcomes, and radiographic outcomes will be tracked.

Study Timeline

• Study Start: 2016-07-06
• Study First Submitted: 2016-07-14
• Study First Submitted QC: 2016-09-07
• Study First Posted: 2016-09-13
• Status Verified: 2020-02
• Primary Completion: 2020-07-19
• Last Update Submitted: 2020-08-19
• Last Update Posted: 2020-08-20
• Study Completion: 2022-10

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 56

Inclusion Criteria

• Patients who assent/consent to participate in this study for prospective surveillance

• Patients at least 10 years old, inclusive, on the day of surgery

• Patients with idiopathic scoliosis

• Patient who has failed bracing (as defined by greater than 5° of progression and/or intolerance to brace wear)

• Patients who underwent an anterior vertebral body tethering procedure for treatment of scoliosis via thoracoscopic access or mini-thoracotomy

• Patients with a Lenke type 1 curve with lumbar modifier of A or B

• Patients whose pre-operative Cobb angle was ≥ 30° and ≤ 65°

• Patients whose pre-operative thoracic scoliometer reading is ≤ 20°

• Patients whose structural, thoracic curve bends out to ≤ 30° Cobb angle pre-operatively

  • Ideally supine bending film
  • Standing lateral bending film also acceptable

• Patients of Sanders stage ≤ 5 or Risser sign of ≤ 3 at the time of surgery

• Patients and parents that understand English

Exclusion Criteria

• Patients with vertebral body staples at any level of their spine

  ---Specifically, vertebral body staples that span an intervertebral disc space and are implanted for fusionless correction of scoliosis

• Patients with any spine surgery prior to their VBT procedure

• Patients with any deformity correction surgery, on their Lenke 1 curve, after their VBT procedure

• With the exception of tether re-tensioning

• Patients with any vertebral bodies that were instrumented outside of a thoracoscopic or minithoracotomy approach in conjunction with their VBT procedure

• Patients that have an orthotic prescribed and used to correct their Lenke 1 curve any time after their VBT procedure but before the 2 year primary endpoint

• Patients who are pregnant

• Patients unwilling to return for prospective follow-up visit(s)

• Patients with major psychiatric disorders (as defined in DSM-5)

• Patients with a history of substance abuse (as defined in DSM-5)

• Patients who are wards of the court

• Patients who are in an active drug or device trial that is more than minimal risk and where their participation in the trial would confound the measurements of the present study

• Patients who are in a device trial for efficacy of a musculoskeletal device and where their participation in the trial would confound the measurements of the present study

• Patients who are less than 30 days out from completion from another clinical trial of more than minimal risk or for safety and efficacy

• Patients for whom the investigator deems unwilling/incapable of participating

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
The Spinal Tethering System group	The Spinal Tethering System	Patients with adolescent idiopathic scoliosis that have been implanted with the Spinal Tethering System in an anterior vertebral body tethering construct.

Primary Outcome Measures

Name	Time	Method
Quantification and timing of all adverse events	Up to 18 years of age or skeletal maturity is reached	Patients will be followed until skeletal maturity or 18 years old; whichever is longer.
Cobb angle measurement of the patient's coronal deformity	2 Years post Index Vertebral Body Tethering Surgery	Coronal Cobb angle at 24 month follow up after vertebral body tethering

Secondary Outcome Measures

Name	Time	Method
Longitudinal changes in thoracic kyphosis.	Yearly up to 2 years post index surgery. Biannually after 2 year post index surgery. Collected until patient is 18 or skeletally mature, whichever is longer.
Longitudinal changes in SRS-22 (as available)	Yearly up to 2 years post index surgery. Biannually after 2 year post index surgery. Collected until patient is 18 or skeletally mature, whichever is longer.	All prospective visits will capture the SRS-22 (Scoliosis Research Society 22 item patient questionnaire) score. This patient reported outcome is not standard of care therefore only prospective visits will capture the assessment.
Longitudinal changes in coronal balance	Yearly up to 2 years post index surgery. Biannually after 2 year post index surgery. Collected until patient is 18 or skeletally mature, whichever is longer.
Longitudinal changes in coronal Cobb angle.	Yearly up to 2 years post index surgery. Biannually after 2 year post index surgery. Collected until patient is 18 or skeletally mature, whichever is longer.	In addition to the primary endpoint finding at 2 years post index surgery, this measure will assess durability of the coronal Cobb angle through skeletal maturity.
Longitudinal changes in PedsQL (as available)	Yearly up to 2 years post index surgery. Biannually after 2 year post index surgery. Collected until patient is 18 or skeletally mature, whichever is longer.	All prospective visits will capture the standard core scale of the PedsQL. This patient reported outcome is not standard of care therefore only prospective visits will capture the assessment.
Longitudinal changes in APPT (as available)	Yearly up to 2 years post index surgery. Biannually after 2 year post index surgery. Collected until patient is 18 or skeletally mature, whichever is longer.	All prospective visits will capture the APPT (adolescent pediatric pain tool) score. This patient reported outcome is not standard of care therefore only prospective visits will capture the assessment.
Longitudinal changes in sagittal balance.	Yearly up to 2 years post index surgery. Biannually after 2 year post index surgery. Collected until patient is 18 or skeletally mature, whichever is longer.
Longitudinal changes in thoracic spine height.	Yearly up to 2 years post index surgery. Biannually after 2 year post index surgery. Collected until patient is 18 or skeletally mature, whichever is longer.	Capture of total vertical thoracic spine height at every post-surgical follow up until the patient is 18 years old or skeletally mature.

Trial Locations

Locations (1)

Shriners Hospitals for Children; 🇺🇸 Philadelphia, Pennsylvania, United States