19 Harley St, London, W1G 9QJ, UK
We are London's Top Spine Clinic

Biomechanical evaluation of DTRAX Facet System.

Related Articles

Biomechanical evaluation of DTRAX Facet System.

J Biomech Eng. 2014 Jan 1;

Authors: Leasure J, Buckley J

Objective: A majority of the middle-aged population exhibit cervical spondylosis that may require decompression and fusion of the affected level. Minimally invasive cervical fusion is an attractive option for decreasing operative time, morbidity, and mortality rates. A novel device, the DTRAX facet screw system (Providence Medical) promises minimally invasive deployment resulting in decompression of the neuroforamen and interfacet fusion. Present study investigates the effectiveness of the device in minimizing intervertebral motion to promote fusion, decompression of the nerve root during bending activity, and performance of the implant to adhere to anatomy during repeated bending loads. Methods: We observed flexion, extension, lateral bending, and axial rotation range of motion in cadaver models of c-spine treated with DTRAX as stand-alone and supplementing anterior plating. DTRAX was deployed bilaterally at single levels. Specimens were placed at the limit of range-of-motion in flexion, extension, axial bending, and lateral bending. 3-D images of the foramen were taken and post-processed to quantify changes in foraminal area. Stand-alone DTRAX specimens were subjected to 30K cycles at 2 Hz of non-simultaneous flexion-extension and lateral bending under compressive load and xray imaged at regular cycle intervals for quantitative measurements of device loosening. Results: Stand-alone DTRAX increased specimen rigidity in all directions except extension. 86% of all deployments resulted in some level of foraminal distraction. Rate of effective distraction was maintained in flexed, extended, and axially rotated postures. Two specimens demonstrated no detectable implant loosening (<0.25 mm). Three showed unilateral sub-clinical loosening (0.4 mm maximum), and one had sub-clinical loosening bilaterally (0.5 mm maximum). Conclusion: Results of our study are comparable to previous investigations into the rigidity of other stand-alone minimally invasive technologies. DTRAX system effectively increased rigidity of the affected level comparable to predicate systems. Results of this study indicates DTRAX increases foraminal area in the cervical spine, and decompression is maintained during bending activities. Clinical studies will be necessary to determine whether the magnitude of decompression observed in this cadaveric study will effectively treat cervical radiculopathy; however, results of this study, taken in context of successful decompression treatments in the lumbar spine, are promising for the continued development of this product. Results of this biomechanical study are encouraging for the continued investigation of this device in animal and clinical trials, as they suggest the device is well fixated and mechanically competent.

PMID: 24389961 [PubMed – as supplied by publisher]

Share to care...

Share on facebook
Share on twitter
Share on pinterest
Share on google
Share on linkedin
Share on skype

What we do...

The Harley Street Hospital


What is London spine unit and How it Works

The London Spine Unit was established in 2005 and has successfully treated over 5000 patients. All conditions are treated.

We treat all spinal disorders

The London Spine Unit specialises in Minimally Invasive Treatments allowing rapid recovery and return to normal function

Trusted by patients worldwide

The London Spine Unit provides the highest quality care to all patients and has VIP services for those seeking exceptional services

What our patients say about us ......

L5 Nerve Root Compression

A very good experience. Efficient and friendly. Aftercare at the hospital was excellent. Patricia M. You May Also Like:Patient following nerve root and facet joint

Read More »

Patient with bulging disc

Staff are very polite and the surgeon was charming. Felt confident throughout diagnosis and treatment. Staff both helpful, good natured and understanding. I am improving all the

Read More »