Experimental validation of adaptive pedicle screws—a novel implant concept using shape memory alloys

Werner, Michael; Hammer, Niels; Rotsch, Christian; Berthold, Isabell; Leimert, Mario

doi:10.1007/s11517-019-02059-x

Cited by 12 publications

(16 citation statements)

References 23 publications

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“…Our own preliminary tests with new cementless implant systems, therefore, involved additional sheets made of SMA [ 7 ].…”

Section: Discussionmentioning

confidence: 99%

“…New concepts for advanced implant designs and geometry modifications aim to enhance bone anchorage to achieve subsequent stability, and are currently within the research focus of a number of groups [ 1 , 2 , 3 , 4 , 5 , 6 ]. Previous studies by our own group were concerned with the development of expandable screws [ 7 ]. Additionally, another preliminary study by our own group showed that unprocessed SMA sheets are biocompatible and appropriate for application in orthopedic surgery [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

“…SMA expansion sheets developed as part of a previous study [ 7 ] were designed to expand in cancellous bone similarly to a dowel, increasing the contact surface and wedging within the bone [ 7 ]. These previously designed sheets had smooth surfaces, which resulted in increased anchoring stability.…”

Section: Introductionmentioning

confidence: 99%

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Biological Cell Investigation of Structured Nitinol Surfaces for the Functionalization of Implants

et al. 2020

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Expandable implants including shape memory alloy (SMA) elements have great potential to minimize the risk of implant loosening and to increase the primary stability of bone anchoring. Surface structuring of such elements may further improve these properties and support osteointegration and bone healing. In this given study, SMA sheets were processed by deploying additive and removal manufacturing technologies for 3D-printed surgical implants. The additive technology was realized by applying a new laser beam melting technology to print titanium structures on the SMA sheets. The removal step was realized as a standard process with an ultrashort-pulse laser. The morphology, metabolic activity, and mineralization patterns of human bone marrow stromal cells were examined to evaluate the biocompatibility of the new surface structures. It was shown that both surface structures support cell adhesion and the formation of a cytoskeleton. The examination of the metabolic activity of the marrow stromal cells on the samples showed that the number of cells on the laser-structured samples was lower when compared to the 3D-printed ones. The calcium phosphate accumulation, which was used to examine the mineralization of marrow stromal cells, was higher in the laser-structured samples than in the 3D-printed ones. These results indicate that the additive- and laser-structured SAM sheets seem biocompatible and that the macrostructure surface and manufacturing technology may have positive influences on the behavior of the bone formation. The use of the new additive technique and the resulting macrostructures seems to be a promising approach to combine increased anchorage stability with simultaneously enhanced osteointegration.

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“…Our own preliminary tests with new cementless implant systems, therefore, involved additional sheets made of SMA [ 7 ].…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Biological Cell Investigation of Structured Nitinol Surfaces for the Functionalization of Implants

et al. 2020

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“…The aim of osteoporotic treatment is, therefore, to increase the primary stability and fatigue strength of implants. Our first approaches showed that the use of a superelastic Nickel–Titanium shape memory alloy (NiTi SMA) to anchor elements in titanium (Ti6Al4V) bone implants has a great potential to increase primary stability within the bone [ 7 , 8 , 9 ]. Ti6Al4V is a widely used standard material for bone implants in medical technology, especially in osteosynthesis [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…Ti6Al4V is a widely used standard material for bone implants in medical technology, especially in osteosynthesis [ 10 ]. The use of nickel–titanium shape memory alloys (thermal and superelastic alloys) have also been widely researched and are used in human medicine [ 7 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Hybrid Production of a Superelastic Shape Memory Alloy with Additively Manufactured Structures for Medical Implants

et al. 2021

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The demographic change in and the higher incidence of degenerative bone disease have resulted in an increase in the number of patients with osteoporotic bone tissue causing. amongst other issues, implant loosening. Revision surgery to treat and correct the loosenings should be avoided, because of the additional patient stress and high treatment costs. Shape memory alloys (SMA) can help to increase the anchorage stability of implants due to their superelastic behavior. The present study investigates the potential of hybridizing NiTi SMA sheets with additively manufactured Ti6Al4V anchoring structures using laser powder bed fusion (LPBF) technology to functionalize a pedicle screw. Different scanning strategies are evaluated, aiming for minimized warpage of the NiTi SMA sheet. For biomechanical tests, functional samples were manufactured. A good connection between the additively manufactured Ti6Al4V anchoring structures and NiTi SMA substrate could be observed though crack formation occurring at the transition area between the two materials. These cracks do not propagate during biomechanical testing, nor do they lead to flaking structures. In summary, the hybrid manufacturing of a NiTi SMA substrate with additively manufactured Ti6Al4V structures is suitable for medical implants.

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Biomechanical design and analysis of auxetic pedicle screw to resist loosening

Yao

Yuan

Huang

et al. 2021

Computers in Biology and Medicine

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Experimental validation of adaptive pedicle screws—a novel implant concept using shape memory alloys

Cited by 12 publications

References 23 publications

Biological Cell Investigation of Structured Nitinol Surfaces for the Functionalization of Implants

Biological Cell Investigation of Structured Nitinol Surfaces for the Functionalization of Implants

Investigation into the Hybrid Production of a Superelastic Shape Memory Alloy with Additively Manufactured Structures for Medical Implants

Biomechanical design and analysis of auxetic pedicle screw to resist loosening

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