Flexible device for vertebral body replacement

Main, J; Wells, Mark; Spengler, Dan M.; Strauss, Alvin M.; Keller, Tony S.

doi:10.1016/0141-5425(89)90119-2

Cited by 5 publications

(2 citation statements)

References 17 publications

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“…Zusätzli-che Probleme wie Pseudarthrose, Transplantatsinterung mit daraus resultierender Kyphose sowie ungewollte Transplantatwanderung mit Fehllage, führten zu einem vermehrten Einsatz von Cages als Wirbelkörperersatz an der thorakolumbalen Wirbelsäule [2,5,6,13,17]. Der Meshed Titanium Cage nach Harms (DePuy Acromed, Sulzbach, Germany) ist einer der bekanntesten nichtdistrahierbaren Cages, der als Wirbelkörperersatz zur Anwendung kommt [16].…”

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Expandierbare Cages als Wirbelk�rperersatz

Khodadadyan-Klostermann

Schaefer

Schleicher

et al. 2004

Chirurg

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Design variations of expandable cages for vertebral body replacement do not show any significant effect on the biomechanical results. There was no significant difference found, between the biomechanical properties of expandable and non-expandable cages. After corporectomy, isolated implantation of expandable cages plus anterior plating was not able to restore normal stability of the motion segment. As a consequence, isolated anterior stabilization using cages plus LCDCP should not be used for vertebral body replacement in the thoraco-lumbar spine.

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Expandierbare Cages als Wirbelk�rperersatz

Khodadadyan-Klostermann

Schaefer

Schleicher

et al. 2004

Chirurg

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“…Compared to [2], friction caused by motion of two parts can be avoided. Unlike in [5], the monolithic geometry renders assembly work redundant. To proof the performance of AM solid state hinges, their durability in context to the fatigue limit of the material still has to be assessed.…”

Section: Discussionmentioning

confidence: 99%

Design of Flexible Implants for Preservation of Physiological Mobility Exploiting Additive Manufacturing

Kimm¹,

Jauer²,

Hinke³

et al.

EPiC Series in Health Sciences

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Due to tumors or bone fractures caused by high mechanical impact, the affected tissue has to be removed. The implantation of a stabilizing replacement is a common solution for defect bridging and support of bone ossification. Preserving the physiological mobility after the treatment could prevent stress shielding or overload of the surrounding muscles and ligaments. [1]In case of a critical vertebral body defect, the body and its attached disks have to be removed. Thereafter the adjacent vertebral bodies are braced together resulting in limited physiological spine movability. A flexible implant adapted to and preserving the patient-specific physiological spine mobility would be a desirable solution. [2] [3]To realize such an implant additive manufacturing (AM) can be used as a key technology. AM offers the following advantages: The build-up of almost any desired complex geometry shape, without additional costs. A monolithic geometry with enhanced functionalities combined in only one part and one material. A cost-efficient implant individualization based on patient specific requirements. [4]Relating to flexibility, the integration of solid state hinges tailored to the patient specific physiological mobility is possible. Hereby, assembly work is neglectable and abrasion will be prevented due to the absence of friction partners. A challenge to overcome will be the durability of the design. It is limited by the fatigue of the material caused by implant motion.

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Wirbelk�rperersatz in der Wirbels�ulenchirurgie

et al. 2004

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Autografts and allogeneous bone grafts as well as cages are used for the reconstruction of the anterior column after corpectomy. Recently, expandable cages for vertebral body replacement have been developed. Based on our own experience, the purpose of this study was to summarize the available biomechanical and clinical data of expandable corpectomy cages and to compare it with established fixation techniques. If used correctly, expandable cages offer several surgical advantages in comparison to non-expandable cages. However there were no significant differences between the biomechanical properties of expandable and non-expandable cages. Additionally, design variations of expandable corpectomy cages did not show any significant impact on the biomechanical stability. Currently available mid-term clinical and radiological data on the treatment of fractures, metastasis and infection of the cervical, thoracic and lumbar spine demonstrated no significant difference between expandable and non-expandable cages. However, the increased stress-shielding effect of expandable cages compared to non-expandable cages might result in a deterioration of the long-term clinical outcome.

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Flexible device for vertebral body replacement

Cited by 5 publications

References 17 publications

Expandierbare Cages als Wirbelk�rperersatz

Expandierbare Cages als Wirbelk�rperersatz

Design of Flexible Implants for Preservation of Physiological Mobility Exploiting Additive Manufacturing

Wirbelk�rperersatz in der Wirbels�ulenchirurgie

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