Spinal segment range of motion as a function of in vitro test conditions: Effects of exposure period, accumulated cycles, angular-deformation rate, and moisture condition
✍ Scribed by Wilke, Hans-Joachim ;Jungkunz, Bettina ;Wenger, Karl ;Claes, Lutz E.
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 142 KB
- Volume
- 251
- Category
- Article
- ISSN
- 0003-276X
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✦ Synopsis
Background:
The purpose of this study was to thoroughly evaluate the relationship of possible mechanical and environmental conditions in the testing of spinal joint segments, including ambient-temperature exposure, accumulated test cycles, angular-deformation rate, and moisture condition on the motion characteristics of joints, with the example of isolated spinal segments.
Methods:
In one test, controlled loading was applied to six motion segments every 8 hours in each of the primary anatomical directions while moisture was held constant. in a second test, 18 specimens were divided equally into moisture-static, air-exposed, and slowly irrigated groups and loaded to 500 cycles. in a third test, a similar sample was tested over a range of angular-deformation rates (0.6-5.1 degrees/second).
Results:
Range of motion (rom) increased steadily with ambient-temperature exposure time, resulting in a 10% change at about 20 hours but was most stable in the moisture-static group over both accumulated load cycles and loading rate changes.
Conclusions:
The most critical factor for functional testing of spinal segments appears to be length of exposure.