A Prospective Study of the Safety and Efficacy of 3D-printed Non-rigid Biomimetic Implant in Cervical and Thoracolumbar Spine

Study Purpose

Vertebral body resection is a wide accepted procedure in tumor resection, deformity correction, and anterior decompression in spondylosis, ossification of posterior longitudinal ligaments, and spondylodiscitis surgery. However, reconstruction of segmental defect is still challenging to spine surgeon, especially in 3-column resection, such as total en bloc spondylectomy in tumor patients. Various graft or prosthesis for reconstruction has been reported, such as structural allograft, Harms mesh cages, expandable cages, and carbon fiber stackable cages. There are no high evidence level study examining the superiority of those different methods. Recently, 3D printed vertebral body replacement has been reported in different disease entities as well, such as tumor, Kümmell's disease in osteoporosis, and spondylosis. 3D printed implant comes with superiority in production of complex geometries and regularity of the fine surface detailed that promote bone ingrowth. Although, 3D-printed titanium vertebra could achieved bone integration in human, a systemic review showed that the subsidence noted in 31.4% of spine surgery with 3D printed implants. In spine surgery, the fixation construct is sufficiently stiff, interbody motion can be reduced, and loading sharing promotes bone fusion. On the other hand, if the reconstruction is too stiff, stress shielding at fusion site occurs. The concept of dynamic fusion, as opposed to rigid fusion, has been demonstrated by an anterior cervical interbody fusion study in porcine model, demonstrating good bone formation, less postfusion stiffness, and a trend to less subsidence. Thus, we developed a 3D printed, custom-made, biomimetic prosthesis, with non-rigid structure, which has been tested in biomechanical study and porcine model, showing good bone formation and less stiffness as well. Therefore, we proposed a prospective clinical study to investigate safety, subsidence, and fusion of this prosthesis.

Recruitment Criteria

Accepts Healthy Volunteers Healthy volunteers are participants who do not have a disease or condition, or related conditions or symptoms	No
Study Type An interventional clinical study is where participants are assigned to receive one or more interventions (or no intervention) so that researchers can evaluate the effects of the interventions on biomedical or health-related outcomes. An observational clinical study is where participants identified as belonging to study groups are assessed for biomedical or health outcomes. Searching Both is inclusive of interventional and observational studies.	Interventional
Eligible Ages	20 Years - 79 Years
Gender	All

More Inclusion & Exclusion Criteria

Inclusion Criteria:

1. Age 20

- 79 years; 2.

Patient meet the indication for 1- to 3- level corpectomy, for primary bone tumor at spine, or metastatic tumor at spine. 3. Deficit confirmed by CT, MRI, and X-ray; 4. Pathology level located from C3 to L5. 5. Physically and mentally able and willing to comply with the protocol; 6. Signed informed consent; 7. NTU Spine Multidisciplinary Board confirmed tumor excision surgery is indicated. 8. Life expectancy longer than 6 months (Tokuhashi Scoring System)

Exclusion Criteria:

1. Patient does not meet the indication of corpectomy, which is under the surveillance. 2. More than three vertebrae required corpectomy; 3. Corpectomy levels above C3 and below L5. 4. T-score less than -2.5. 5. Known allergy to device materials

- such as titanium.

6. Any diseases or conditions that would preclude accurate clinical evaluation; 7. Daily, high-dose oral and/or inhaled steroid or a history of chronic use of high dose steroids; 8. BMI > 35. 9. Life expectancy less than 6 months

- (Tokuhashi Scoring System) 10.

The subject has received radiation therapy or chemotherapy at the trial site within one year; 11. Anterior spine surgery has been received at or near the spine surgery site; 12. The subject has systemic infection,or focal vertebral infection or trauma; 13. The subject has endocrine disorders or metabolic disorders known to affect bone formation, such as: Paget's disease, renal osteodystrophy, hypothyroidism; 14. The subject has neuromuscular diseases, those at risk of instability, implant fixation failure or postoperative care complications, including: spina bifida, cerebral palsy, and multiple sclerosis; 15. Osteopenia, osteomyelitis; 16. Pregnant women.

Trial Details

Trial ID: This trial id was obtained from ClinicalTrials.gov, a service of the U.S. National Institutes of Health, providing information on publicly and privately supported clinical studies of human participants with locations in all 50 States and in 196 countries.	NCT05396222
Phase Phase 1: Studies that emphasize safety and how the drug is metabolized and excreted in humans. Phase 2: Studies that gather preliminary data on effectiveness (whether the drug works in people who have a certain disease or condition) and additional safety data. Phase 3: Studies that gather more information about safety and effectiveness by studying different populations and different dosages and by using the drug in combination with other drugs. Phase 4: Studies occurring after FDA has approved a drug for marketing, efficacy, or optimal use.	N/A
Lead Sponsor The sponsor is the organization or person who oversees the clinical study and is responsible for analyzing the study data.	National Taiwan University Hospital
Principal Investigator The person who is responsible for the scientific and technical direction of the entire clinical study.	Fon-Yih Fon-Yih, PhD
Principal Investigator Affiliation	National Taiwan University Hospital
Agency Class Category of organization(s) involved as sponsor (and collaborator) supporting the trial.	Other
Overall Status	Not yet recruiting
Countries	Taiwan
Conditions The disease, disorder, syndrome, illness, or injury that is being studied.	Spinal Tumor

Additional Details

This is a single-arm prospective observational phase I clinical study to investigate the safety of the non-rigid 3D printed custom-made biomimetic implant. The implants are made of Titanium alloy. Patient receiving 1- to 3-level corpectomy at cervical and thoracolumbar spine. At first stage, we plan to enroll 3 cervical patients, and 3 thoracolumbar patients with non-rigid 3D printed custom-made biomimetic reconstructions. After 3 months observation after the last patients enrolled, we will conduct an interim investigation to investigate those 6 patients. if there is no re-operations due to acute post-operative reconstruction failure. We will continue the study. Total 9 cervical patients, and 9 thoracolumbar patients will be enrolled. Patients are evaluated preoperatively, right after surgery, and 1, 3, 6, 12 months postoperatively. Measure outcomes included overall success, VAS neck and back pain, patient satisfaction, anxiety score, SF-12 MCS/PCS, complications, subsequent surgery rate, and subsidence and fusion rate on radiological examination. Radiological evaluation, including X-ray and computed tomography, will be done pre-operatively, immediately after the surgery, and 1, 3, 6, 12 months postoperatively. In addition, neck disability index (NDI) will be evaluated in cervical patents, and SORGSQ 2.0 self-reported questionnaire will be applied for all oncology patients. The primary endpoint was a FDA composite definition of success comprising clinical improvement and absence of major complications and secondary surgery events.

Arms & Interventions

Arms

Experimental: 3D-printed

We developed a 3D printed, custom-made, biomimetic prosthesis, with non-rigid structure, which has been tested in biomechanical study and porcine model, showing good bone formation and less stiffness as well. Therefore, we proposed a prospective clinical study to investigate safety, subsidence, and fusion of this prosthesis.

Interventions

Device: - 3D-printed custom-made non-rigid biomimetic implant

Contact a Trial Team

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