A Pilot Study of rhBMP-2/ACS With the INTERFIX™ Device for the AnteriorLumbar Interbody Fusion in Patients With Degenerative Disc Disease

Not Applicable

Completed

• Conditions: Degenerative Disc Disease
• Interventions: Device: rhBMP-2/ACS/INTERFIX™; Device: Autogenous bone/INTERFIX™

• Registration Number: NCT01491451
• Lead Sponsor: Medtronic Spinal and Biologics

Brief Summary

The purpose of this pilot clinical trial is to evaluate the device design as a method of facilitating spinal fusion.

Detailed Description

Not available

Study Timeline

• Study Start: 1999-02
• Primary Completion: 2003-01
• Study Completion: 2003-01
• Study First Submitted: 2011-12-12
• Study First Submitted QC: 2011-12-13
• Study First Posted: 2011-12-14
• Status Verified: 2023-05
• Last Update Submitted: 2023-05-16
• Last Update Posted: 2023-05-17

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 45

Inclusion Criteria

1. Has degenerative disc disease as noted by back pain of discogenic origin, with or without leg pain, with degeneration of the disc confirmed by patient history (e.g., pain [leg, back, or symptoms in the sciatic nerve distribution], function deficit and/or neurological deficit) and radiographic studies (e.g., CT, MRI, X-Ray, etc.) to include one or more of the following:

   • instability (defined as angular motion >= 5° and/or translation >= 4mm, based on Flex/Ext radiographs);
   • osteophyte formation;
   • decreased disc height;
   • thickening of ligamentous tissue;
   • disc degeneration or herniation; and/or
   • facet joint degeneration.

2. Has preoperative Oswestry score >= 35.

3. Has no greater than Grade 1 spondylolisthesis utilizing Meyerding's Classification (Meyerding HW, 1932.).

4. Has single-level symptomatic degenerative involvement from L2 to S1.

5. Is at least 18 years of age, inclusive, at the time of surgery.

6. Has not responded to non-operative treatment (e.g., bed rest, physical therapy, medications, spinal injections, manipulation, and/or TENS) for a period of at least 6 months.

7. If female of child-bearing potential, who is not pregnant or nursing, and who agrees to use adequate contraception for 16 weeks following surgery.

8. Is willing and able to comply with the study plan and sign the Patient Informed Consent Form.

Exclusion Criteria

1. Had previous anterior spinal fusion surgical procedure at the involved level.
2. Has posterior spinal instrumentation (which will not be removed) stabilizing the involved level or has had a previous posterior lumbar interbody fusion procedure at the involved level.
3. Has a condition which requires postoperative medications that interfere with fusion, such as steroids.
4. Has been previously diagnosed with osteopenia, osteoporosis, or osteomalacia to a degree that spinal instrumentation would be contraindicated.
5. Has presence of active malignancy.
6. Has overt or active bacterial infection, either local or systemic.
7. Is grossly obese, i.e., weight> 40% over ideal for their age and height.
8. Has fever (temperature> 101°F oral) at the time of surgery.
9. Has a documented titanium alloy allergy or intolerance.
10. Is mentally incompetent. If questionable, obtain psychiatric consult.
11. Has a Waddell Signs of Inorganic Behavior score of 3 or greater.
12. Is a prisoner.
13. Is an alcohol and/or drug abuser as defined by currently undergoing treatment for alcohol and/or drug usage.
14. Is a tobacco user at the time of surgery.
15. Has received drugs which may interfere with bone metabolism within two weeks prior to the planned date of spinal fusion surgery (e.g., steroids or methotrexate).
16. Has a history of autoimmune disease (Systemic Lupus Erythematosus or Dermatomyositis).
17. Has a history of exposure to injectable collagen implants.
18. Has a history of hypersensitivity to protein pharmaceuticals (monoclonal antibodies or gamma globulins) or collagen.
19. Has received treatment with an investigational therapy within 28 days prior to implantation surgery or such treatment is planned during the 16 weeks following rhBMP-2/ACS implantation.
20. Has received any previous exposure to any/all BMP of either human or animal extraction.
21. Has a history of allergy to bovine products or a history of anaphylaxis.
22. Has history of endocrine or metabolic disorder known to affect osteogenesis (e.g., Paget's disease, renal osteodystrophy, Ehlers-Danlos syndrome, or osteogenesis imperfecta).

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
rhBMP-2/ACS	rhBMP-2/ACS/INTERFIX™	-
Autogenous bone	Autogenous bone/INTERFIX™	-

Primary Outcome Measures

Name	Time	Method
Pain/Disability Status	24 month	The self-administered Oswestry Low Back Pain Disability Questionnaire will be used. Success for each individual patient will be defined as pain/disability improvement postoperatively according to the following definition: Preoperative Score - Postoperative Score \>= 15
Neurological Status	24 month	Neurological status will be assessed preoperatively and postoperatively using a comprehensive neurological status scale.
Fusion	24 month	Fusion is defined as: 1. Evidence of bridging trabeculae.; 2. No evidence of motion as defined by: a. No more than 3mm difference in translation on the lateral flexion/extension radiographs as determined by superimposing the two views, one upon the other. b.Less than 5° difference in angular motion between flexion and extension as seen on lateral flexion/extension radiographs.; 3. No evidence of radiolucency surrounding greater than 50% of either device.

Secondary Outcome Measures

Name	Time	Method
Patient Satisfaction	24 month
Hip (Donor Site) Pain	24 month
Disc Height Measurement	24 month
Patient Global Perceived Effect	24 month
General Health Status (SF-36)	24 month
Pain Status (back pain, leg pain)	24 month