Spinal Implants

Univ.-Prof. biol. hum. Hendrik Schmidt

Learn more about our research on implants for the spine.

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Improvement of existing spinal implants

Specific back pain is one of the most common causes of degenerative diseases of the lumbar spine, in the course of which there may be segment instability, facet joint arthrosis or spinal stenosis structures. Surgical therapies were designed to stabilize the segment to relieve overstressed structures and eliminate a possibly resulting narrowing of the spinal canal with compression of neural structures in the past. Today the most effective surgical treatment in segment instability is the anterior inter-corporeal fusion (spinal fusion). With autogenous cancellous bone augmented cages (spacers, cage) the therapeutically desired stabilization of the lumbar spine is brought about.

While stability must always be regarded as primary goal, implants were developed to additionally provide mobility. Especially mobile disc prostheses have to be named, but also interspinous implants which are placed in between the spinous processes, or so called dynamic implants which - contrary to rigid fixators - leave some mobility and ought to release the intervertebral discs and the facet joints.

Publications

Non-fusion Implants

2014
The effect of design parameters of interspinous implants on kinematics and load bearing: an in vitro study.

Schilling C, Pfeiffer M, Grupp TM, Blömer W, Rohlmann A
Eur Spine J. 2014 Apr;23(4):762-71
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2013
Parameters influencing the outcome after total disc replacement at the lumbosacral junction. Part 2: distraction and posterior translation lead to clinical failure after a mean follow-up of 5 years.

Strube P, Hoff EK, Schmidt H, Dreischarf M, Rohlmann A, Putzier M
Eur Spine J. 2013 Oct;22(10):2279-87
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2012
Which Radiographic Parameters Are Linked to Failure of a Dynamic Spinal Implant?

Hoff E, Strube P, Rohlmann A, Groß C, Putzier M
Clin Orthop Relat Res. 2012 Jul;470(7):1834-46
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Effect of multilevel lumbar disc arthroplasty on spine kinematics and facet joint loads in flexion and extension: a finite element analysis.
Schmidt H, Galbusera F, Rohlmann A, Zander T, Wilke HJ
Eur Spine J. 2012 Jun;21 Suppl 5:663-74
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2011
Pedicle-screw-based dynamic implants may increase posterior intervertebral disc bulging during flexion.

Boustani HN, Zander T, Disch AC, Rohlmann A
Biomed Tech (Berl). 2011 Dec;56(6):327-31
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2009
Influence of different artificial disc kinematics on spine biomechanics.

Zander T, Rohlmann A, Bergmann G
Clin Biomech (Bristol, Avon). 2009 Feb;24(2):135-42
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2008
Effect of position and height of a mobile core type artificial disc on the biomechanical behaviour of the lumbar spine.

Rohlmann A, Zander T, Bock B, Bergmann G
Proc Inst Mech Eng H. 2008 Feb;222(2):229-39
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2007
Biomechanische Konsequenzen von verschiedenen Positionierungen bewegungserhaltender Bandscheibenimplantate. Eine Finite-Elemente-Studie an der Lendenwirbelsäule.

Zander T, Rohlmann A, Bock B, Bergmann G
Orthopade. 2007 Mar;36(3):205-6, 208-11
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Comparison of the effects of bilateral posterior dynamic and rigid fixation devices on the loads in the lumbar spine: a finite element analysis.
Rohlmann A, Burra NK, Zander T, Bergmann G
Eur Spine J. 2007 Aug;16(8):1223-31
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2006
Effect of a posterior dynamic implant adjacent to a rigid spinal fixator.

Zander T, Rohlmann A, Burra NK, Bergmann G
Clin Biomech (Bristol, Avon). 2006 Oct;21(8):767-74
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2005
Effect of an interspinous implant on loads in the lumbar spine.

Rohlmann A, Zander T, Burra NK, Bergmann G
Biomed Tech (Berl). 2005 Oct;50(10):343-7
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Effect of total disc replacement with ProDisc on intersegmental rotation of the lumbar spine.
Rohlmann A, Zander T, Bergmann G
Spine (Phila Pa 1976). 2005 Apr 1;30(7):738-43
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Implants for Fusion

2012
Which postures are most suitable in assessing spinal fusion using radiostereometric analysis?

Boustani HN, Rohlmann A, van der Put R, Burger A, Zander T
Clin Biomech (Bristol, Avon). 2012 Feb;27(2):111-6
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2009
Large sizes of vertebral body replacement do not reduce the contact pressure on adjacent vertebral bodies per se.

Zander T, Bergmann G, Rohlmann A
Med Eng Phys. 2009 Dec;31(10):1307-12
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2007
Comparison of the effects of bilateral posterior dynamic and rigid fixation devices on the loads in the lumbar spine: a finite element analysis.

Rohlmann A, Burra NK, Zander T, Bergmann G
Eur Spine J. 2007 Aug;16(8):1223-31
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2006
Effects of fusion-bone stiffness on the mechanical behavior of the lumbar spine after vertebral body replacement.

Rohlmann A, Zander T, Bergmann G
Clin Biomech (Bristol, Avon). 2006 Mar;21(3):221-7
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2005
Comparison of the biomechanical effects of posterior and anterior spine-stabilizing implants.

Rohlmann A, Zander T, Bergmann G
Eur Spine J. 2005 Jun;14(5):445-53
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2002
Einfluss eines doppelten Zwischenwirbelkäfigs auf das mechanische Verhalten der Lendenwirbelsäule

Rohlmann A, Zander T, Fehrmann M, Klöckner C, Bergmann G
Biomed Tech (Berl). 2002 May;47(5):124-9
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Einfluss von Implantaten zum Ersatz eines Wirbelkörpers auf das mechanische Verhalten der Lendenwirbelsäule.
Rohlmann A, Zander T, Fehrmann M, Klöckner C, Bergmann G
Orthopade. 2002 May;31(5):503-7
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1999
Internal spinal fixator stiffness has only a minor influence on stresses in the adjacent discs.

Rohlmann A, Calisse J, Bergmann G, Weber U
Spine (Phila Pa 1976). 1999 Jun 15;24(12):1192-5; discussion 1195-6
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Further Surgical Techniques

2012
Comparison of four reconstruction methods after total sacrectomy: A finite element study.

Zhu R, Cheng LM, Yu Y, Zander T, Chen B, Rohlmann A
Clin Biomech (Bristol, Avon). 2012 Oct;27(8):771-6
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2010
Stabilization of the osteoporotic spine from a biomechanical viewpoint.

Heyde CE, Rohlmann A, Weber U, Kayser R
Orthopade. 2010 Apr;39(4):407-16
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2006
Spinal loads after osteoporotic vertebral fractures treated by vertebroplasty or kyphoplasty.

Rohlmann A, Zander T, Bergmann G
Eur Spine J. 2006 Aug;15(8):1255-64
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2005
Einfluss der Wirbelkörpersteifigkeit vor und nach Vertebroplastik auf den intradiskalen Druck.

Rohlmann A, Zander T, Jony, Weber U, Bergmann G
Biomed Tech (Berl). 2005 May;50(5):148-52
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2004
Analysis of simulated single ligament transection on the mechanical behaviour of a lumbar functional spinal unit.

Zander T, Rohlmann A, Bergmann G
Biomed Tech (Berl). 2004 Jan-Feb;49(1-2):27-32
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2003
Influence of graded facetectomy and laminectomy on spinal biomechanics.

Zander T, Rohlmann A, Klöckner C, Bergmann G
Eur Spine J. 2003 Aug;12(4):427-34
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2002
Comparison of the mechanical behavior of the lumbar spine following mono- and bisegmental stabilization.

Zander T, Rohlmann A, Klöckner C, Bergmann G
Clin Biomech (Bristol, Avon). 2002 Jul;17(6):439-45
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Effect of bone graft characteristics on the mechanical behavior of the lumbar spine.
Zander T, Rohlmann A, Klöckner C, Bergmann G
J Biomech. 2002 Apr;35(4):491-7
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Scoliosis

2008
Flexible non-fusion scoliosis correction systems reduce intervertebral rotation less than rigid implants and allow growth of the spine: a finite element analysis of different features of orthobiom (TM).

Rohlmann A, Zander T, Burra NK, Bergmann G
Eur Spine J. 2008 Feb;17(2):217-23
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2006
Effect of different surgical strategies on screw forces after correction of scoliosis with a VDS implant.

Rohlmann A, Richter M, Zander T, Klöckner C, Bergmann G
Eur Spine J. 2006 Apr;15(4):457-64
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Barbara Schiller

Secretariat Prof. Hendrik Schmidt

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