Ignite Creation Date:
2024-05-05 @ 11:52 AM
Last Modification Date:
2024-10-26 @ 9:14 AM
Study NCT ID:
NCT00152165
Status:
COMPLETED
Last Update Posted:
2008-12-02
First Post:
2005-09-08
Brief Title:
Use of Radiostereometric Analysis RSA Following Spinal Fusion Versus the DYNESYS Stabilization System
Sponsor:
State University of New York - Upstate Medical University
Organization:
State University of New York - Upstate Medical University
Study Overview
Official Title:
A Biomechanical Assessment of the DYNESYS Stabilization System Using Radiostereometric Analysis
Status:
COMPLETED
Status Verified Date:
2008-12
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
None
Brief Summary:
Twelve subjects will be sought for this study Six subjects will receive the DYNESYS system and six subjects will receive a posterior lumbar interbody fusion PLIF with the Silhouette device All subjects will already be participating in the DYNESYS multi-center study under IRB 4884 and will have been randomized to either group Five tantalum beads will be inserted into each vertebra associated with the DYNESYS or fusion surgery Subjects will be followed in conjunction with the multi-center follow-up schedule and will have RSA exams at the following time points after surgery 3 6 12 18 and 24 months Standing neutral flexion extension and lateral bending films will be collected at each time point and the amount of motion in each direction of the marked vertebrae will be measured The time points have been selected based on their clinical relevance for comparison against the standard of care which is the fusion procedure Depending on the initial tension of the annular fibers it is possible the DYNESYS will exhibit more motion with time The time points are important to track the potential changes
Detailed Description:
The amount of motion of the vertebrae following spinal surgery is important in determining the success of a procedure Assessment of spinal motion has been and continues to be a difficult clinical problem Errors of up to 10 degrees for simple measurements of flexion extension and side bending have been recorded using conventional radiographs It has therefore been difficult to accurately measure changes in spinal motion using conventional radiographs
Radiostereometric Analysis or RSA is an accurate in vivo measurement technique using two simultaneous radiographs for examining spinal motion The measurement accuracy offered by this technique far exceeds the manual techniques currently used In addition to improved accuracy it provides more information on spinal motion in comparison to conventional radiographs Utilization of the RSA technology at the IHP and the United States is in its infancy The investigators have placed much effort over the past 1-2 years to put the necessary dedicated resources and personnel in place This has been a collaborative effort between the Department of Orthopedic Surgery and the Imaging Core at IHP Preliminary work on the accuracy reliability and surgical planning for use of RSA has been completed and presented at national conferences
The purpose of this study is to assess the amount of motion in the lumbar spine in patients with a dynamic stabilization system DYNESYS Currently the DYNESYS is under investigation as part of a multi-center clinical trial IRB 4884 The DYNESYS system is designed to allow for some motion in the spine while providing the necessary stability to the spinal segment The amount and degree of this motion is currently unknown By using tantalum bead markers placed in the spine at the time of the surgery RSA analysis can determine the amount of motion the DYNESYS system provides Normal spinal motion of the lower spine is approximately 18 and 12 degrees for flexionextension and lateral bending respectively Lumbar interbody fusion which is the current standard surgical procedure results in 5 degrees or less of spinal motion Since the DYNESYS provides dynamic stabilization it is estimated that there will be a 20 loss of motion with the DYNESYS in comparison to normal motion Two questions will be examined in this study 1 what is the amount of flexionextension and lateral bending motion that occurs in the spine with a dynamic stabilization system in relation to a lumbar interbody fusion procedure and 2 will the amount of motion change during the time frame of the study
This study will involve 12 patients 6 with DYNESYS and 6 with posterior lumbar interbody fusion PLIF here at SUNY Upstate Medical University Any subject who is part of the DYNESYS multi-center clinical trial IRB 4884 will be approached to participate in this RSA study The subjects will already have been randomly assigned to the fusion group or the DYNESYS group The RSA study is a single center non-randomized design All 12 subjects will have 10-15 tantalum markers placed in their spine at the time of their DYNESYS or fusion surgery After surgery subjects will have the special x-rays taken and the RSA analysis will be completed Subjects will be seen at the following time points after surgery 3 6 12 18 and 24 months
Radiostereometric Analysis or RSA is an accurate in vivo measurement technique using two simultaneous radiographs for examining spinal motion The measurement accuracy offered by this technique far exceeds the manual techniques currently used In addition to improved accuracy it provides more information on spinal motion in comparison to conventional radiographs Utilization of the RSA technology at the IHP and the United States is in its infancy The investigators have placed much effort over the past 1-2 years to put the necessary dedicated resources and personnel in place This has been a collaborative effort between the Department of Orthopedic Surgery and the Imaging Core at IHP Preliminary work on the accuracy reliability and surgical planning for use of RSA has been completed and presented at national conferences
The purpose of this study is to assess the amount of motion in the lumbar spine in patients with a dynamic stabilization system DYNESYS Currently the DYNESYS is under investigation as part of a multi-center clinical trial IRB 4884 The DYNESYS system is designed to allow for some motion in the spine while providing the necessary stability to the spinal segment The amount and degree of this motion is currently unknown By using tantalum bead markers placed in the spine at the time of the surgery RSA analysis can determine the amount of motion the DYNESYS system provides Normal spinal motion of the lower spine is approximately 18 and 12 degrees for flexionextension and lateral bending respectively Lumbar interbody fusion which is the current standard surgical procedure results in 5 degrees or less of spinal motion Since the DYNESYS provides dynamic stabilization it is estimated that there will be a 20 loss of motion with the DYNESYS in comparison to normal motion Two questions will be examined in this study 1 what is the amount of flexionextension and lateral bending motion that occurs in the spine with a dynamic stabilization system in relation to a lumbar interbody fusion procedure and 2 will the amount of motion change during the time frame of the study
This study will involve 12 patients 6 with DYNESYS and 6 with posterior lumbar interbody fusion PLIF here at SUNY Upstate Medical University Any subject who is part of the DYNESYS multi-center clinical trial IRB 4884 will be approached to participate in this RSA study The subjects will already have been randomly assigned to the fusion group or the DYNESYS group The RSA study is a single center non-randomized design All 12 subjects will have 10-15 tantalum markers placed in their spine at the time of their DYNESYS or fusion surgery After surgery subjects will have the special x-rays taken and the RSA analysis will be completed Subjects will be seen at the following time points after surgery 3 6 12 18 and 24 months
Study Oversight
Has Oversight DMC:
None
Is a FDA Regulated Drug?:
None
Is a FDA Regulated Device?:
None
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?:
None