A Motion Transducer for Use in the Intact In-Vitro Human Lumbar Spine

1977 ◽  
Vol 99 (3) ◽  
pp. 160-165 ◽  
Author(s):  
T. A. Koogle ◽  
R. L. Piziali ◽  
D. A. Nagel ◽  
I. Perkash
Keyword(s):  
Lumbar Vertebrae ◽  
Limited Range ◽  
Spinal Fixation ◽  
Human Lumbar Spine ◽  
Fixation Devices ◽  
Six Degree Of Freedom ◽  
Spinal Fixation Devices ◽  
Two Bodies ◽  
Motion Transducer

An electromechanical transducer was developed to enable measurement of the general six degree-of-freedom relative motion between lumbar vertebrae of the in-vitro human spine. The transducer system is to be used in the evaluation of various spinal fixation devices in studies of fracture dislocated spines. Preliminary testing of the system has shown it to be an accurate and general means of measuring relative spatial motion between two bodies over a limited range.

Comparison of loads on internal spinal fixation devices measured in vitro and in vivo

1997 ◽  
Vol 19 (6) ◽  
pp. 539-546 ◽  
Author(s):  
A. Rohlmann ◽  
G. Bergmann ◽  
F. Graichen ◽  
U. Weber
Keyword(s):  
Spinal Fixation ◽  
Fixation Devices ◽  
Spinal Fixation Devices

The Volume of Motion: Introduction, Derivation, and an Application Comparing Various Spinal Fixation Devices

1993 ◽  
Vol 115 (1) ◽  
pp. 43-46 ◽  
Author(s):  
J. J. Crisco
Keyword(s):  
Rigid Body ◽  
Three Dimensional ◽  
Spinal Fixation ◽  
Dimensional Parameter ◽  
Directional Information ◽  
One Dimensional ◽  
Fixation Devices ◽  
Spinal Fixation Devices ◽  
Mathematical Derivation

Range of motion (ROM), the displacement between two limits, is one of the most common parameters used to describe joint kinematics. The ROM is a one-dimensional parameter, although the motion at many normal and pathological joints is three-dimensional. Certainly, the ROM yields vital information, but an overall measure of the three-dimensional mobility at a joint may also be useful. The volume of motion (VOM) is such a measure. The translational VOM is the volume defined by all possible ROMs of a point on a rigid body. The rotational VOM, although its interpretation is not as tangible as the translational VOM, is a measure of the three-dimensional rotational mobility of a rigid body. The magnitude of the VOM is proportional to mobility; the VOM is a scaler, which does not contain any directional information. Experimental determination of the VOM is not practical since it would require applying loads in an infinite number of directions. The mathematical derivation given here allows the VOM to be calculated, with the assumption of conservative elasticity, from the resultant displacements of three distinct load vectors of equal magnitude. An example of the VOM is presented in the comparison of the biomechanical stabilizing potential of various spinal fixation devices.

Comparison of porcine and human lumbar spine flexion mechanics*

2003 ◽  
Vol 16 (01) ◽  
pp. 44-49 ◽  
Author(s):  
G. A. Dumas ◽  
D. A. Bednar ◽  
J. P. Dickey
Keyword(s):  
Lumbar Spine ◽  
Range Of Motion ◽  
Mechanical Tests ◽  
Neutral Position ◽  
Spinal Fixation ◽  
Potential Health ◽  
Human Lumbar Spine ◽  
Pure Moment ◽  
Low Stiffness

SummaryAnimal models have been proposed as an alternative to human spinal specimens for in vitro mechanical testing due to the limited availability, poor reproducibility, high cost, and potential health risk associated with human specimens. The purpose of this study was to directly compare the flexion biomechanics of porcine and human lumbar spines. We determined the range of motion, laxity zone and the stiffness under pure-moment flexion loading. The porcine and human specimens showed qualitative similarities in mechanical behaviour. However the porcine specimens demonstrated a number of quantitative differences including a less-stiff, more extensive, low-stiffness region around the neutral position and a larger flexion range of motion. The results suggest that the porcine lumbar spine may be a potential model for the human lumbar spine for certain in vitro mechanical tests including comparisons between spinal fixation constructs.

Clamping Stiffness and Its Influence on Load Distribution Between Paired Internal Spinal Fixation Devices

1996 ◽  
Vol 9 (3) ◽  
pp. 234???240 ◽  
Author(s):  
Antonius Rohlmann ◽  
Jorge Calisse ◽  
Georg Bergmann ◽  
Jens Radvan ◽  
Heinz-Michael Mayer
Keyword(s):  
Load Distribution ◽  
Spinal Fixation ◽  
Fixation Devices ◽  
Spinal Fixation Devices

F-0924 A Comparative Study on Stiffness and Stability of Spinal Fixation Devices.

2001 ◽  
Vol IV.01.1 (0) ◽  
pp. 73-74
Author(s):  
Hiroki KAWASHIMA ◽  
Ko TAKANO ◽  
Kazuhiro HASEGAWA ◽  
Toshiaki HARA
Keyword(s):  
Comparative Study ◽  
Spinal Fixation ◽  
Fixation Devices ◽  
Spinal Fixation Devices

The effect of six degree of freedom loading sequence on the in-vitro compressive properties of human lumbar spine segments

2016 ◽  
Vol 49 (14) ◽  
pp. 3407-3414 ◽  
Author(s):  
D.B. Amin ◽  
I.M. Lawless ◽  
D. Sommerfeld ◽  
R.M. Stanley ◽  
B. Ding ◽  
...  
Keyword(s):  
Lumbar Spine ◽  
Degree Of Freedom ◽  
Compressive Properties ◽  
Human Lumbar Spine ◽  
Loading Sequence ◽  
Six Degree Of Freedom

A Reproducible Porcine Vertebral Fracture for Biomechanical Testing of Spinal Fixation Devices

1992 ◽  
Vol &NA; (284) ◽  
pp. 267???272 ◽  
Author(s):  
GORDON RUSSELL ◽  
GUY LAVOIE ◽  
ROBERT EVENSON ◽  
MARC MOREAU ◽  
DAVID BUDNEY ◽  
...  
Keyword(s):  
Vertebral Fracture ◽  
Biomechanical Testing ◽  
Spinal Fixation ◽  
Fixation Devices ◽  
Spinal Fixation Devices
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