A Study of Low Elastic Modulus Expandable Pedicle Screws in Osteoporotic Sheep

Shi, Lei; Wang, Ling; Guo, Zheng; Wu, Zixiang; Li, Da; Gao, Mingxuan; Wan, Shengpeng; Fu, Shishun; Li, Shujun; Lei, Wei

doi:10.1097/bsd.0b013e31820ef9f7

Cited by 19 publications

(21 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Different thread designs serve a diverse range of mechanical functions that must take into consideration the material properties of the bone that it is to be paired with [34–36, 38, 50]. Moreover, a screw material that would offer not only excellent mechanical properties but also exceptional biocompatible properties is crucial for successful long term performance [12, 51]. Design alteration is a topic of interest in the literature and the pros and cons of altering each design characteristic are individually discussed.…”

Section: Basic Screw Designmentioning

confidence: 99%

“…For instance, many pedicle screws are made out of stainless steel due to its biocompatibility and high strength [10, 13, 16, 28, 51, 62–66]; however, titanium has been considered to have superior mechanical and biological properties over stainless steel [51, 67]. For instance, with a lower modulus of elasticity, it is more flexible than stainless steel, which would allow for a reduction in stress shielding [12, 51]. Secondly, while it is considered to be a biocompatible material, it is also classified as bioactive which will thus promote osteointegration between the bone and screw [12, 51].…”

Section: Basic Screw Designmentioning

confidence: 99%

“…Studies have shown that an increased diameter of the screw may increase fixation and stability; however, the screw diameter is limited by the anatomy of the pedicle and the risk of a pedicle fracture. Alternatively, expandable screws have been proposed to create an increase in diameter at either its distal end [12, 18, 21, 22, 40–44] or more medially just past the posterior cortex [10, 45] after its implantation, reducing the risk of pedicle fracture but increasing the purchase in the vertebral body.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Designs and Techniques That Improve the Pullout Strength of Pedicle Screws in Osteoporotic Vertebrae: Current Status

Shea

Laun

Gonzalez-Blohm

et al. 2014

BioMed Research International

132

View full text Add to dashboard Cite

Osteoporosis is a medical condition affecting men and women of different age groups and populations. The compromised bone quality caused by this disease represents an important challenge when a surgical procedure (e.g., spinal fusion) is needed after failure of conservative treatments. Different pedicle screw designs and instrumentation techniques have been explored to enhance spinal device fixation in bone of compromised quality. These include alterations of screw thread design, optimization of pilot hole size for non-self-tapping screws, modification of the implant's trajectory, and bone cement augmentation. While the true benefits and limitations of any procedure may not be realized until they are observed in a clinical setting, axial pullout tests, due in large part to their reproducibility and ease of execution, are commonly used to estimate the device's effectiveness by quantifying the change in force required to remove the screw from the body. The objective of this investigation is to provide an overview of the different pedicle screw designs and the associated surgical techniques either currently utilized or proposed to improve pullout strength in osteoporotic patients. Mechanical comparisons as well as potential advantages and disadvantages of each consideration are provided herein.

show abstract

Section: Basic Screw Designmentioning

confidence: 99%

Section: Basic Screw Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Designs and Techniques That Improve the Pullout Strength of Pedicle Screws in Osteoporotic Vertebrae: Current Status

Shea

Laun

Gonzalez-Blohm

et al. 2014

BioMed Research International

132

View full text Add to dashboard Cite

show abstract

“…In recent years, goats, calves, dogs, pigs, and other large animals were used for research and development of the intrasegmental fixation instrument by more and more scholars [22–24]. In this research, goats at 2 to 3 months of age were selected.…”

Section: Discussionmentioning

confidence: 99%

A Biomechanical Research of Growth Control of Spine by Shape Memory Alloy Staples

Zhang

Zheng

et al. 2013

BioMed Research International

View full text Add to dashboard Cite

Shape memory alloy (SMA) staples in nickel titanium with shape memory effect are effective for spinal growth control. This study was designed to evaluate the biomechanical properties of the staples and observe the stability of the fixed segments spine after the staples were implanted. According to the vertical distance of the vertebrae, SMA staples of 5, 6.5, and 8 mm were designed. The recovery stress of 24 SMA staples in three groups was measured. The pullout strength of SMA staples and stainless steel staples in each functional spinal unit was measured. Each of the six fresh specimens was divided into three conditions: normal, single staple, and double staples. Under each condition, the angle and torque of spinal movements in six directions were tested. Results show that the differences in recovery stress and maximum pullout strength between groups were statistically significant. In left and right bending, flextion, and extention, the stability of spine was decreased in conditions of single staple and double staples. Biomechanical function of SMA staples was superior to stainless steel staple. SMA staples have the function of hemiepiphyseal compression and kyphosis and scoliosis model of thoracic vertebrae in goat could be successfully created by the fusionless technique.

show abstract

“…Therefore, materials with low Young's modulus are often preferred to realize healthy spine formation [28,29]. However, these devices also require high Young's modulus as they are subjected to bending during surgery to obtain the physiological curvature of the spine [30].…”

Section: Self-tunable Young's Modulusmentioning

confidence: 99%

Enhancing Functionalities of Metallic Materials by Controlling Phase Stability for Use in Orthopedic Implants

Nakai

Niinomi

Cho

et al. 2015

Interface Oral Health Science 2014

View full text Add to dashboard Cite

This chapter aims to review the recent trends pertaining to the enhanced functionalities, including low Young's modulus, self-tunable Young's modulus, and low magnetic susceptibility, of titanium and zirconium alloys for use in orthopedic implants. These value-added functionalities can be realized by controlling the type of crystal structure and their lattice structure stabilities, which are related to the phase stability of titanium and zirconium alloys. Keywords Magnetic susceptibility • Metallic materials • Orthopedic implant • Phase stability • Young's modulus IntroductionOne of the most important factors concerning the use of orthopedic implants is to ensure safety in usage, which is often associated with their mechanical reliability to endure physiologically cyclic loading and unexpected large loads during treatment. Given these considerations, metallic materials are advantageous over ceramic and polymeric materials for use as implantable materials. Therefore, more than 80 % of the implant devices used till date are made of metallic materials [1]. Another important factor concerning the use of orthopedic implants is their toxicity toward living tissues. In general, the human body inherently resists any incoming toxic element. In other words, human body exhibits low permittivity to highly toxic elements eluted from orthopedic implants [2]. That is, the toxicity of orthopedic implants depends not only on the nature of the metallic elements but also on the amount of them, which, in turn, strongly depends on the corrosion resistance of each metallic material. Therefore, in the human body, a metallic material with high corrosion resistance is highly imperative to ensure their safe usage as orthopedic implants.

show abstract

A Study of Low Elastic Modulus Expandable Pedicle Screws in Osteoporotic Sheep

Cited by 19 publications

References 0 publications

Designs and Techniques That Improve the Pullout Strength of Pedicle Screws in Osteoporotic Vertebrae: Current Status

Designs and Techniques That Improve the Pullout Strength of Pedicle Screws in Osteoporotic Vertebrae: Current Status

A Biomechanical Research of Growth Control of Spine by Shape Memory Alloy Staples

Enhancing Functionalities of Metallic Materials by Controlling Phase Stability for Use in Orthopedic Implants

Contact Info

Product

Resources

About