Revision of a Charité artificial disc 9.5 years in vivo to a new Charité artificial disc: case report and explant analysis

David, Thierry

doi:10.1007/s00586-004-0842-x

Cited by 70 publications

(33 citation statements)

References 6 publications

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“…Constraints to lateral bending and axial rotation are provided by the saddle-shaped articulations. Unconstrained prostheses in the lumbar spine have been shown to be associated with rotational instability [1,10,23,24]. This problem has been analyzed biomechanically.…”

Section: Discussionmentioning

confidence: 99%

Local and global subaxial cervical spine biomechanics after single-level fusion or cervical arthroplasty

et al. 2009

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An experimental in vitro biomechanical study was conducted on human cadaveric spines to evaluate the motion segment (C4-C5) and global subaxial cervical spine motion after placement of a cervical arthroplasty device (Altia TDI TM ,Amedica, Salt Lake City, UT) as compared to both the intact spine and a single-level fusion. Six specimens (C2-C7) were tested in flexion/extension, lateral bending, and axial rotation under a ± 1.5 Nm moment with a 100 N axial follower load. Following the intact spine was tested; the cervical arthroplasty device was implanted at C4-C5 and tested. Then, a fusion using lateral mass fixation and an anterior plate was simulated and tested. Stiffness and range of motion (ROM) data were calculated. The ROM of the C4-C5 motion segment with the arthroplasty device was similar to that of the intact spine in flexion/extension and slightly less in lateral bending and rotation, while the fusion construct allowed significantly less motion in all directions. The fusion construct caused broader effects of increasing motion in the remaining segments of the subaxial cervical spine, whereas the TDI did not alter the adjacent and remote motion segments. The fusion construct was also far stiffer in all motion planes than the intact motion segment and the TDI, while the artificial disc treated level was slightly stiffer than the intact segment. The Altia TDI allows for a magnitude of motion similar to that of the intact spine at the treated and adjacent levels in the in vitro setting.

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Section: Discussionmentioning

confidence: 99%

Local and global subaxial cervical spine biomechanics after single-level fusion or cervical arthroplasty

et al. 2009

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“…1,2,3 However, larger series of retrieved implants have been discussed at recent national meetings. 4 Although the published literature regarding retrievals is currently limited, the state of knowledge is expanding rapidly.…”

mentioning

confidence: 99%

Explant Analysis of Total Disc Replacement

Anderson

Kurtz

Toth

2006

Seminars in Spine Surgery

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“…Another experimental study, by Nechtow et al [16], showed that the Charité could have either very little wear, or significant wear, depending on the input parameters used. Isolated clinical case studies have demonstrated that it is possible for an implanted Charité to function for many years without significant wear [2,10], duly recognizing the cost and complication risks of revising the implant, should a problem occur. More recently, however, clinical retrieval studies have shown that measurable wear does indeed occur in the Charité [11], and that subsequent wear particle generation invokes a response in periprosthetic tissue [20], although in ongoing clinical series, osteolysis incidence remains low.…”

Section: Discussionmentioning

confidence: 99%

Preferential superior surface motion in wear simulations of the Charité total disc replacement

et al. 2010

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Laboratory wear simulations of the dual-bearing surface Charité total disc replacement (TDR) are complicated by the non-specificity of the device's center of rotation (CoR). Previous studies have suggested that articulation of the Charité preferentially occurs at the superior-bearing surface, although it is not clear how sensitive this phenomenon is to lubrication conditions or CoR location. In this study, a computational wear model is used to study the articulation kinematics and wear of the Charité TDR. Implant wear was found to be insensitive to the CoR location, although seemingly non-physiologic endplate motion can result. Articulation and wear were biased significantly to the superior-bearing surface, even in the presence of significant perturbations of loading and friction. The computational wear model provides novel insight into the mechanics and wear of the Charité TDR, allowing for better interpretation of in vivo results, and giving useful insight for designing future laboratory physical tests.

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Revision of a Charité artificial disc 9.5 years in vivo to a new Charité artificial disc: case report and explant analysis

Cited by 70 publications

References 6 publications

Local and global subaxial cervical spine biomechanics after single-level fusion or cervical arthroplasty

Local and global subaxial cervical spine biomechanics after single-level fusion or cervical arthroplasty

Explant Analysis of Total Disc Replacement

Preferential superior surface motion in wear simulations of the Charité total disc replacement

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