Instrumented Vertebral Body Replacements

Univ.-Prof. biol. hum. Hendrik Schmidt

Severe compression fractures of a vertebral body or a tumour in the region of the spine sometimes require the replacement of a vertebral body by an implant. The loads on such an implant are not well known. In order to measure these loads, the commercially available vertebral body replacement "SYNEX" was modified. It allows the in vivo measurement of three force components and three moments acting on the implant. The 9-channel telemetry transmitter developed in our biomechanics laboratory was placed into the cylinder of the implant together with six load sensors and a coil for the inductive power supply.

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Measurements

Messung mit Wirbelkörperersatz
Telemeterized implant mount on plastic spine

Instrumented vertebral body replacements were implanted in five patients since 2006. Implantations in up to 1ten patients are planned. The implant loads, which probably correlate with the spinal load, will be measured for many activities of daily living. The example shows the implant loads for elevation of the right arm with a weight of 50 N in the hand. This causes an increase of the resultant implant force from about 400 N to nearly 900 N. Further results of the load measurements can be found in the data base
OrthoLoad.

Patients

Patients with instrumented vertebral body replacements during load measurements.

Publications

2014
Methods for Avoiding or Reducing High Spinal Loads in Everyday Life.

Rohlmann A, Graichen F, Bergmann G
Physiother Phys Rehabil, 2014 1(2): 105
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Spinal Loads during Post-Operative Physiotherapeutic Exercises.
Rohlmann A, Schwachmeyer V, Graichen F, Bergmann G
PLoS One. 2014 9(7):e102005, 3.23 Impact Factor
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Activities of everyday life with high spinal loads.
Rohlmann A, Pohl D, Bender A, Graichen F, Dymke J, Schmidt H, Bergmann G
PLoS One. 2014 9(5):e98510, 3.23 Impact Factor
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Spinal Loads during Cycling on an Ergometer.
Rohlmann A, Zander T, Graichen F, Schmidt H, Bergmann G
PLoS One. 2014 9(4):e95497, 3.23 Impact Factor
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How does the way a weight is carried affect spinal loads?
Rohlmann A, Zander T, Graichen F, Schmidt H, Bergmann G
Ergonomics. 2014 57(2):262-70, 1.61 Impact Factor
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Loads on a vertebral body replacement during locomotion measured in vivo.
Rohlmann A, Dreischarf M, Zander T, Graichen F, Bergmann G
Gait Posture. 2014 39(2):750-5
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In vivo measurements of the effect of whole body vibration on spinal loads.
Rohlmann A, Schmidt H, Gast U, Kutzner I, Damm P, Bergmann G
Eur Spine J. 2014 23(3):666-72, 2.47 Impact Factor
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2013
Monitoring the load on a telemeterised vertebral body replacement for a period of up to 65 months.

Rohlmann A, Dreischarf M, Zander T, Graichen F, Strube P, Schmidt H, Bergmann G
Eur Spine J. 2013 22(11):2575-81, 2.47 Impact Factor
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Correlation between back shape and spinal loads.
Srbinoska H, Dreischarf M, Consmüller T, Bergmann G, Rohlmann A
Journal of Biomechanics 2013. doi:pii: S0021-9290(13)00218-2. 10.1016/j.jbiomech.2013.04.024. , 2.75 Impact Factor
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Effect of an orthosis on the loads acting on a vertebral body replacement.
Rohlmann A, Zander T, Graichen F, Bergmann G
Clin Biomech (Bristol, Avon). 2013. pii: S0268-0033(13)00069-7., 1.88 Impact Factor
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2012
Lifting up and laying down a weight causes high spinal loads.
Rohlmann A, Zander T, Graichen F, Bergmann G
Journal of Biomechanics 2012. doi:pii: S0021-9290(12)00620-3. 10.1016/j.jbiomech.2012.10.022. , 2.75 Impact Factor
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Spinal loads during position changes.
Rohlmann A, Petersen R, Schwachmeyer V, Graichen F, Bergmann G
Clin Biomech (Bristol, Avon). 2012 27(8):754-8, 1.88 Impact Factor
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2011
Measured loads on a vertebral body replacement during sitting.

Rohlmann A, Zander T, Graichen F, Dreischarf M, Bergmann G
Spine J. 2011 11(9):870-875, 2.47 Impact Factor
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2010
Different arm positions and the shape of the thoracic spine can explain contradictory results in the literature about spinal loads for sitting and standing.

Dreischarf M, Bergmann G, Wilke HJ, Rohlmann A
Spine (Phila Pa 1976). 2010 Oct 15;35(22):2015-21., 2.45 Impact Factor
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Loads on a spinal implant measured in vivo during whole-body vibration.
Rohlmann A, Hinz B, Bluthner R, Graichen F, Bergmann G
Eur Spine J. 19(7) 1129-35, 2010, 2.47 Impact Factor
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2008
Loads on a Telemeterized Vertebral Body Replacement Measured in Two Patients.

Rohlmann A, Graichen F, Kayser R, Bender A, Bergmann G
Spine: 33(11) 1170-1179, 2008, 2.45 Impact Factor
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Loads on a telemeterized vertebral body replacement measured in three patients within the first postoperative month.
Rohlmann A, Graichen F, Bender A, Kayser R, Bergmann G
Clin Biomech: 23 147-158, 2008, 1.88 Impact Factor
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2007
An instrumented implant for vertebral body replacement that measures loads in the anterior spinal column.

Rohlmann A, Gabel U, Graichen F, Bender A, Bergmann G
Medical Engineering & Physics: 29 580-585, 2007, 1.84 Impact Factor
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