Effects of Cervical Cages on Load Distribution of Cancellous Core

Teo, Ee-Chon; Yang, Kai; Fuss, Franz Konstantin; Lee, Kim-Kheng; Qiu, Tian-Xia; Ng, Hong-Wan

doi:10.1097/00024720-200406000-00010

Cited by 21 publications

(18 citation statements)

References 26 publications

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“…The literature includes many studies describing FE models of the intact cervical spine (Yoganandan et al 1996;Maurel et al 1997;Teo and Ng 2001;Goel and Clausen 1998). Some authors focus on cervical fusion procedures (Teo et al 2004;Pitzen et al 2002), but, to our knowledge, computational studies predicting the biomechanics of the spine implanted with a cervical disc prosthesis have not yet been performed.…”

Section: Introductionmentioning

confidence: 99%

Biomechanics of the C5-C6 Spinal Unit Before and After Placement of a disc prosthesis

Galbusera

Fantigrossi

Raimondi

et al. 2006

Biomech Model Mechanobiol

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The study consists of a biomechanical comparison between the intact C5-C6 spinal segment and the same segment implanted with the Bryan artificial disc prosthesis (Medtronic Ltd., Memphis, TN, USA), by the use of the finite element (FE) method. Our target is the prediction of the influence of prosthesis placement on the resulting mechanics of the C5-C6 spine unit. A FE model of the intact C5-C6 segment was built, employing realistic models of the vertebrae, disc and ligaments. Simulations were conducted imposing a compression preload combined to a flexion/extension moment, a pure lateral bending moment and a pure torsion moment, and the calculated results were compared to data from literature. The model was then modified to include the Bryan cervical disc prosthesis, and the simulations were repeated. The location of the instantaneous center of rotation (ICR) of C5 with respect to C6 throughout flexion/extension was calculated in both models. In general, the moment-rotation curves obtained from the disc prosthesis-implanted model were comparable to the curves obtained from the intact model, except for a slightly greater stiffness induced by the artificial disc. The position of the calculated ICRs was rather stable throughout flexion-extension and was generally confined to a small area, qualitatively matching the corresponding physiological region, in both models. These results imply that the Bryan disc prosthesis allows to correctly reproduce a physiological flexion/extension at the implanted level. The results of this study have quantified aspects that may assist in optimizing cervical disc replacement primarily from a biomechanical point of view.

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Section: Introductionmentioning

confidence: 99%

Biomechanics of the C5-C6 Spinal Unit Before and After Placement of a disc prosthesis

Galbusera

Fantigrossi

Raimondi

et al. 2006

Biomech Model Mechanobiol

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“…Each cage uses tines, threads, or texturing to resist displacement better than bone graft. Despite the variability in industry product, size and placement of the cage are mechanically paramount to design (Teo et al, 2004). Concomitantly, bioresorbable polymer cages have been mechanically compared to titanium cages with mixed results.…”

Section: Anterior Cervicalmentioning

confidence: 99%

Challenges to bone formation in spinal fusion

Reid

Johnson

Wang

2011

Journal of Biomechanics

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“…Zahlreiche Arbeiten haben sich mit den mechanischen Eigenschaften der verschiedenen Stabilisationssysteme und den damit erreichten klinischen Ergebnissen beschäftigt [7,14,19,20,21,36,40,41,42,56,61]. Trotz kontroverser Aussagen scheint sicher zu sein, dass die klinischen Ergebnisse durch die kombinierte Verwendung eines Plattensystems mit einem den Diskusraum straff füllen-den Platzhalter (Cage, "strut graft", Kompositgraft) wesentlich verbessert wurden [3,4,10,11,13,16,18,28,29,37,38,39,50,52,60].…”

Section: Diskussionunclassified

“…Die Qualität und Quantität der Stabilität wird durch die mechanischen Eigenschaften des verwendeten Osteosynthesematerials und durch die Qualität des eigenen Knochens entschieden [7,14,19,20,21,36,40,41,42,56,61]. Die Vaskularität wird von der körpereigenen örtlichen Gewebequalität und besonders von der Art des eingesetzten Transplantatsmaterials/ Ersatzmaterials beeinflusst [8,47,58].…”

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Vordere Spondylodesen an der unteren Halswirbelsäule

Sándor

Barzó

Kuncz

et al. 2008

Chirurg

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Physical alterations in cervical fusions endanger healing. Experimentally we determined less stability loss in fixations using cancellous bone grafts than in those using tricortical grafts. Four hundred eighty-five Patients underwent anterior cervical fusion, for a total of 700 Segments. Patients were divided into four groups: (1) nonlocked H plate with autogenous cancellous bone, (2) nonlocked H plate with autogenous tricortical graft, (3) locked cervical plate with tricortical graft, and (4) stand-alone cage with cancellous bone. Evaluations included X-ray and random CT scan examinations. Our results suggest that anterior cervical fusions using nonlocked H screw plate systems with pure autogenous cancellous bone grafts provide the fastest (6 weeks) and most secure bone healing (P=0.00001), whereas fixations using nonlocked or locked screw plate systems and tricortical autograft require prolonged healing and develop nonunions more frequently. Complete consolidation was achieved using stand-alone cages filled with pure autogenous cancellous bone, but bony healing was delayed due to the cage. Rate of nonunions were: groups 1 and 4 0%, and groups 2 and 3 4.5% and 21%, respectively.

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Effects of Cervical Cages on Load Distribution of Cancellous Core

Cited by 21 publications

References 26 publications

Biomechanics of the C5-C6 Spinal Unit Before and After Placement of a disc prosthesis

Biomechanics of the C5-C6 Spinal Unit Before and After Placement of a disc prosthesis

Challenges to bone formation in spinal fusion

Vordere Spondylodesen an der unteren Halswirbelsäule

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