-
Handchir Mikrochir Plast Chir · Feb 2015
[Biomechanical testing of a new total wrist arthrodesis plate].
- Stefan Passin, N Pochlatko, D Ebi, A Spiegel, and M Sauerbier.
- Klinik für Plastische, Rekonstruktive und Brustchirurgie, Elblandklinikum Radebeul, Radebeul.
- Handchir Mikrochir Plast Chir. 2015 Feb 1; 47 (1): 32-7.
PurposeThe aim of this study was to evaluate the biomechanical properties of the APTUS wrist fusion plate in comparison to those of the AO wrist fusion plate.Material And Method6 APTUS wrist fusion plates (APTUS 2.5 TriLock Wrist Fusion Plate Long Bend) from Medartis (Basel, Switzerland) and 6 AO wrist fusion plates (= LCP Wrist Fusion Plate Standard Bend from Dupuy-Synthes, Bettlach, Switzerland) were installed according to the manufacturers' instructions on life-sized, fibre-glass reinforced polyamide models of a healthy human hand. Then fatigue testing with increasing loads on a monoaxial material testing machine was carried out and the force-movement measurements were recorded on a PC. For up to 50,000 cycles, loading was applied in a sinus-wave frequency of 4 Hz and a force ratio (FMin/FMax) of 0.1-70 N. After 50,000 cycles and then at every 10,000 cycles the load was increased by 15% until breakage or a deformation of over 15 mm at the point of force application of the implant occurred. In addition, the tear-out resistance of 5 screws of each type of plate was examined and the system tear-out resistance calculated. The mean values and standard deviations of fatigue strength, torsional moments and fatigue limits (load cycles) were checked for normal distribution and finally the results were compared by means of non-parametric and parametric statistical tests.ResultsPlate breakage occurred with the AO wrist fusion plate on average after 52,596 (SD±12,833) load cycles and with the APTUS wrist fusion plate after an average of 115,428 (SD±12,600) load cycles. For the AO wrist fusion plates, an average load of 6.3 (SD±0.8) Nm and for the APTUS plate one of 10 (SD±1.7) Nm led to failure. For the APTUS plate the screw tear-out resistance was calculated as 2,632 (SD±96) N while that for the AO plate was found to be 1,449 (SD±314) N.ConclusionIn comparison to the AO wrist fusion plate the APTUS wrist fusion plate has significantly higher fatigue resistance and tear-out strength. On the basis of 100,000 load cycles until bone healing in the case a wrist arthrodesis, use of the APTUS plate should enable bone healing to occur before the implant fails.© Georg Thieme Verlag KG Stuttgart · New York.
Notes
Knowledge, pearl, summary or comment to share?You can also include formatting, links, images and footnotes in your notes
- Simple formatting can be added to notes, such as
*italics*
,_underline_
or**bold**
. - Superscript can be denoted by
<sup>text</sup>
and subscript<sub>text</sub>
. - Numbered or bulleted lists can be created using either numbered lines
1. 2. 3.
, hyphens-
or asterisks*
. - Links can be included with:
[my link to pubmed](http://pubmed.com)
- Images can be included with:
![alt text](https://bestmedicaljournal.com/study_graph.jpg "Image Title Text")
- For footnotes use
[^1](This is a footnote.)
inline. - Or use an inline reference
[^1]
to refer to a longer footnote elseweher in the document[^1]: This is a long footnote.
.