scholarly journals Durability and Biological Response of a New Posterior Dynamic Stabilization System Using Polyethylene with Vitamin E

2018 ◽  
Vol 2018 ◽  
pp. 1-5
Author(s):  
Koji Matsumoto ◽  
Yasuaki Tokuhashi
Keyword(s):  
Vitamin E ◽  
Pedicle Screw ◽  
Inflammatory Cell ◽  
Facet Joint ◽  
Biological Response ◽  
Dynamic Stabilization ◽  
Inflammatory Cell Infiltration ◽  
Stabilization System ◽  
Sliding Surface ◽  
Posterior Dynamic Stabilization

Objective. The purpose of this study was to evaluate the durability and biological response of a new Posterior Dynamic Stabilization system using polyethylene with vitamin E on the sliding surface. Summary of Background Data. The use of polyethylene with vitamin E on the sliding surface in Posterior Dynamic Stabilization has not been reported previously. Methods. A developed pedicle screw-based Posterior Dynamic system consists of four parts: a set screw, a rod, a ball, and a pedicle screw. The rod is inserted into the through hole of the ball, and the ball is sandwiched by the set screw. (1) Fatigue Wear Test. Testing was conducted under a dynamic compressive load of 50N at a speed of 1 Hz for 1 million cycles. We examined the loss of polyethylene due to abrasion in 3 units. (2) Biological Response in Pigs. In two pigs, a new pedicle screw and a conventional pedicle screw were inserted in L2 and L3/4, and L4 and L2/3, respectively. After breeding for 6 months, autopsies were performed. CT imaging was used to evaluate bone union of the facet joint. Abrasive specimens were prepared, and abrasion powder and inflammatory cell infiltration were evaluated microscopically. Results. The average loss of polyethylene due to abrasion was -0.01 mg. In all units, polyethylene showed a decrease of 0.1 mm or less at the contact point with the set screw. The facet joints between the conventional screws exhibited bone fusion, but the facet joint between the conventional and the new screw retained mobility with no bony fusion. No abrasion powder was found and inflammatory cell infiltration was only minimally observed. Conclusion. The new Posterior Dynamic Stabilization system exhibited a high level of durability and biological safety.

scholarly journals Complications associated with the Dynesys dynamic stabilization system: a comprehensive review of the literature

2016 ◽  
Vol 40 (1) ◽  
pp. E2 ◽  
Author(s):  
Martin H. Pham ◽  
Vivek A. Mehta ◽  
Neil N. Patel ◽  
Andre M. Jakoi ◽  
Patrick C. Hsieh ◽  
...  
Keyword(s):  
Pedicle Screw ◽  
Lumbar Fusion ◽  
Dynamic Stabilization ◽  
Adjacent Segment ◽  
Fracture Rate ◽  
Complication Rates ◽  
Stabilization System ◽  
Lumbar Degenerative Disease ◽  
Rate Profile ◽  
Pedicle Screw Loosening

The Dynesys dynamic stabilization system is an alternative to rigid instrumentation and fusion for the treatment of lumbar degenerative disease. Although many outcomes studies have shown good results, currently lacking is a comprehensive report on complications associated with this system, especially in terms of how it compares with reported complication rates of fusion. For the present study, the authors reviewed the literature to find all studies involving the Dynesys dynamic stabilization system that reported complications or adverse events. Twenty-one studies were included for a total of 1166 patients with a mean age of 55.5 years (range 39–71 years) and a mean follow-up period of 33.7 months (range 12.0–81.6 months). Analysis of these studies demonstrated a surgical-site infection rate of 4.3%, pedicle screw loosening rate of 11.7%, pedicle screw fracture rate of 1.6%, and adjacent-segment disease (ASD) rate of 7.0%. Of studies reporting revision surgeries, 11.3% of patients underwent a reoperation. Of patients who developed ASD, 40.6% underwent a reoperation for treatment. The Dynesys dynamic stabilization system appears to have a fairly similar complication-rate profile compared with published literature on lumbar fusion, and is associated with a slightly lower incidence of ASD.

scholarly journals Pedicle Screw-Based Posterior Dynamic Stabilization: Literature Review

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Dilip K. Sengupta ◽  
Harry N. Herkowitz
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Surgical Treatment ◽  
Pedicle Screw ◽  
Clinical Evidence ◽  
Dynamic Stabilization ◽  
Low Back ◽  
Design Rationale ◽  
Clinical Instability ◽  
Posterior Dynamic Stabilization

Posterior dynamic stabilization (PDS) indicates motion preservation devices that are aimed for surgical treatment of activity related mechanical low back pain. A large number of such devices have been introduced during the last 2 decades, without biomechanical design rationale, or clinical evidence of efficacy to address back pain. Implant failure is the commonest complication, which has resulted in withdrawal of some of the PDS devices from the market. In this paper the authors presented the current understanding of clinical instability of lumbar motions segment, proposed a classification, and described the clinical experience of the pedicle screw-based posterior dynamic stabilization devices.

scholarly journals Early Clinical & Radiographic Results of NFix II Posterior Dynamic Stabilization System

2008 ◽  
Vol 2 (2) ◽  
pp. 69-75
Author(s):  
Frank L. Acosta ◽  
Finn Bjarke Christensen ◽  
Jeffrey D. Coe ◽  
Tae-Ahn Jahng ◽  
Scott H. Kitchel ◽  
...  
Keyword(s):  
Dynamic Stabilization ◽  
Stabilization System ◽  
Posterior Dynamic Stabilization
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