Cortical Bone Trajectory Screws vs. Traditional Pedicle Screws Fixation

Second Affiliated Hospital of Wenzhou Medical University

Status: Unknown

Conditions: Spinal Stenosis Lumbar; Intervertebral Disc Degeneration; Lumbar Disc Herniation

Treatments: Procedure: pedicle screws; Procedure: cortical bone trajectory screws

Study type: Interventional

Funder types: Other

Identifiers

NCT03105167

SAHoWMU-CR2017-08-106

Details and patient eligibility

About

Transforaminal lumbar interbody fusion (TLIF) had been favorable for effectively decrease pain and disability in specific spinal disorders; however, there has been concern regarding pedicle screw placement during TLIF surgery. Recently, several biomechanical studies had demonstrated that CBT technique achieves screw purchase and strength equivalent to or greater than the traditional method. Furthermore, Only 1 report examined the surgical outcomes of TLIF with CBT screws fixation compared with TLIF using traditional pedicle screws fixation. TLIF with CBT screws fixation may be effective for specific spinal disorders, but the evidence supporting this possibility is still limited.

Full description

Methods and analysis: Blinded Randomized Controlled Trial (RCT) will be conducted. A total of 108 participants will be randomly allocated to either a CBT-TLIF group or a PS-TLIF group at a ratio of 1:1. The primary clinical outcome measures are: change in back and lower limb pain with Visual analogue scale (VAS) and change in quality adjusted life years (QALY) will be assessed by EQ-5D-5L. Measurements will be carried out at five fixed time points (pre-operatively and at 3, 6, 12 and 24 months).

Ethics and dissemination: The study had been reviewed and approved by the ethics committee of the Second affiliated hospital of the Wenzhou Medical University, Wenzhou, China(batch:2017-03). The results will be presented in peer-reviewed journals and related website within 2 years after the last operation.

Enrollment: 108 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

1. Age of at least 18 years;
2. All of participants will be informed consent;
3. Chronic low back pain (visual analogue scale at least 3 out of 10 at rest and at least 5 out of 10 under physical strain) after having failed conservative treatment for 6 months;
4. Single-segment lower lumbar vertebral disease (Including lumbar spinal cannal stenosis, foraminal stenosis, segmental instability, lumbar disc herniation, and painful disc degeneration (back disc);

Exclusion criteria

1. Serious deformity of lumbar vertebrae;
2. Dysplasia of lumbar pedicle or vertebral laminar;
3. Obvious osteoporosis of lumbar vertebrae;
4. Metabolic bone diseases such as osteomalacia or Paget's disease;
5. Spondylolisthesis > grade 2 (Meyerding);
6. Caudaequina injury or severe radiculopathy;
7. Post inflammatory instability of the vertebral spine;
8. Body mass index > 30;
9. Immunologic diseases or Metabolic syndrome;
10. Therapy with systemic corticosteroids or immunosuppressants;
11. Current using Coumadin (or Warfarin) or Heparin therapy for more than 6 months at the time of operation.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Double Blind

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108 participants in 2 patient groups

CBT-TLIF group

Experimental group

Description:

Patients who are randomised to the CBT-TLIF group will have cortical bone trajectory screws instead of pedicle screws During the opreation. After preventive use of antibliotics,A small skin incision was made at the fused segment, an entry point for insertion of the CBT screws was drilled in the junction of the center of the superior articular process and 1 mm inferior to the inferior border of the transverse process according to Matsukawa et al.A straight probe was used to create a trajectory for the CBT screws from the entry point to the opposite corner of the pedicle and vertebral body under anteroposterior fluoroscopic guidance.nilateral facetectomy is performed to gain access to the intervertebral disc.Afterwards, interbody fusion was performed.Device: CBT screws.

Treatment:

Procedure: cortical bone trajectory screws

PS-TLIF group

Experimental group

Description:

Patients who are randomised to the PS-TLIF group will have pedicle screws During the opreation. A posterior midline incision, about 6 cm, was performed at the level of interest level under fluoroscopic guidance. Pedicle screws were inserted into the vertebral body by using freehand, and the inferior and superior articular processes and part pf the lamina were removed by using an osteotome. To expose the lateral border of the ipsilateral nerve root, the ligamentum flavum was removed. Afterwards, interbody fusion was performed.Device:traditional pedicle screws.

Treatment:

Procedure: pedicle screws