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A Clinical Study of the Dynesys(R) Spinal System

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00759057
Recruitment Status : Terminated (PMA not approved. FDA granted permission to close the study.)
First Posted : September 25, 2008
Last Update Posted : June 28, 2012
Information provided by (Responsible Party):
Zimmer Biomet

Brief Summary:
This non-inferiority study will compare the clinical outcomes of subjects implanted with the Dynesys Spinal System versus the clinical outcomes of subjects implanted with an instrumented posterior lateral spinal fusion.

Condition or disease Intervention/treatment Phase
Degenerative Spondylolisthesis or Retrolisthesis Spinal Stenosis Stenosing Lesion. Device: Posterior Pedicle Screw System Phase 3

Detailed Description:
The purpose of this clinical study is to demonstrate the safety and effectiveness of the Dynesys Spinal System for patients requiring one or contiguous two-level posterior spinal stabilization of the lumbar, and/or sacral spine following decompression. The ability for this implant to maintain spinal alignment and non-fusion of spinal segments, while positively affecting clinical outcomes, will be assessed and compared to a posterior lateral spinal fusion (PLF) procedure using autogenous bone with a semi-rigid, polyaxial posterior spinal fixation system.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 399 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Participant)
Primary Purpose: Treatment
Official Title: A Clinical Study of the Dynesys(R) Spinal System As a Non-fusion Device for Spinal Stabilization
Study Start Date : March 2003
Estimated Primary Completion Date : June 2015
Estimated Study Completion Date : December 2015

Arm Intervention/treatment
Experimental: 1 - Investigational
Dynesys Non-Fusion Spinal System
Device: Posterior Pedicle Screw System
Implantation of Posterior Pedicle Screw System

Active Comparator: 2 - Control
Silhouette Posterior Pedicle Screw System as an adjunct to Posterior Lateral Fusion with Autograft.
Device: Posterior Pedicle Screw System
Implantation of Posterior Pedicle Screw System

Primary Outcome Measures :
  1. Overall Clinical Success (VAS Leg Pain, ODI, Major Complications, Additional Surgical Procedures, Neurological Status) [ Time Frame: 24 Months ]

Secondary Outcome Measures :
  1. Radiographic Success, SF-12, Back Pain, Economic and Function Assessment, Subject Perception [ Time Frame: 24 Months ]

Information from the National Library of Medicine

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Ages Eligible for Study:   20 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Patients having degenerative spondylolisthesis or retrolisthesis (up to Grade 1) AND/OR Patients having lateral or central spinal stenosis or other stenosing lesion as diagnosed by radiculopathic signs, neurogenic claudication or imaging studies;
  • Candidate for single-level or contiguous two-level PLF between L1-S1;
  • Patients have a predominate component of leg rather than back symptoms; symptoms include pain, muscle weakness, and/or sensation abnormality as evidenced by patient history and diagnostic studies.
  • Patients may require decompression at the levels considered for treatment
  • Pre-operative leg pain score greater than or equal to 40 mm on a 100 mm Visual Analog Scale (VAS);
  • Leg pain must be unresponsive to conservative (non-surgical) management for minimum of 3 months;
  • Pre-operative Oswestry score greater than or equal to 30 indicating at least moderate disability;
  • Skeletally mature individual between ages 20 and 80;
  • Must be willing and able to comply with study requirements; including willing and able to sign a study-specific, IRB-approved informed consent form, complete necessary study paperwork and return for required follow-up visits.

Exclusion Criteria:

  • Primary diagnosis of discogenic back pain at affected levels as evidenced by a larger back than leg pain component. In the event of multi-level pathology a discogram should be considered;
  • Patients with leg pain due to etiologies other than those listed above, such as trauma, peripheral vascular disease and neuropathy should be excluded;
  • Degenerative scoliosis greater than 10 degrees at the affected motion segment;
  • Supplemental interbody column support (e.g., bone graft, spacers or fusion cages) is planned at the affected level(s);
  • Greater than Grade I spondylolisthesis or retrolisthesis at the affected level(s);
  • Radiculopathic signs from more than two contiguous or two noncontiguous vertebral body segment(s);
  • Previous lumbar fusion attempt(s), previous total facetectomy or trauma at the affected level(s);
  • Gross obesity defined as exceeding ideal weight by greater than 40% (measurement details are given in Appendix A);
  • Active local or systemic infection;
  • Advanced osteoporosis as evidenced by plain film radiographs or history of fractures and confirmed by DEXA scan to confirm adequate bone density;
  • Receiving immunosuppressive or long-term steroid therapy;
  • Active hepatitis (viral or serum) or HIV positive, renal failure, systemic lupus erythematosus, or any other significant medical conditions which would substantially increase the risk of surgery;
  • Documented history of titanium alloy, PET or PCU allergy, or intolerance;
  • Active malignancy or other significant medical comorbidities;
  • Current chemical dependency or significant emotional and/or psychosocial disturbance that may impact treatment outcome or study participation as evidenced by three or more positive Waddell Signs;
  • Pregnancy;
  • Incarceration;
  • Severe muscular, neural or vascular diseases that endanger the spinal column;
  • Missing bone structures, due to severely deformed anatomy or congenital anomalies, which make good anchorage of the implant impossible;
  • All concomitant diseases that can jeopardize the functioning and success of the patient;
  • Vertebral fractures;
  • Treatment of the thoracic and cervical spine;
  • Severely deformed anatomy due to congenital anomalies;
  • Paralysis

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00759057

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Sponsors and Collaborators
Zimmer Biomet
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Responsible Party: Zimmer Biomet Identifier: NCT00759057    
Other Study ID Numbers: G020291
First Posted: September 25, 2008    Key Record Dates
Last Update Posted: June 28, 2012
Last Verified: June 2012
Keywords provided by Zimmer Biomet:
Spinal Stenosis
Spinal Instability
Leg Pain
Additional relevant MeSH terms:
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Spinal Stenosis
Spinal Diseases
Bone Diseases
Musculoskeletal Diseases