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- Title
Mechanical testing of a device for subcutaneous internal anterior pelvic ring fixation versus external pelvic ring fixation.
- Authors
Osterhoff, Georg; Tiziani, Simon; Ferguson, Stephen J; Spreiter, Gregor; Scheyerer, Max J; Spinas, Gian-Leza; Wanner, Guido A; Simmen, Hans-Peter; Werner, Clément Ml; Werner, Clément M L
- Abstract
<bold>Background: </bold>Although useful in the emergency treatment of pelvic ring injuries, external fixation is associated with pin tract infections, the patient's limited mobility and a restricted surgical accessibility to the lower abdomen. In this study, the mechanical stability of a subcutaneous internal anterior fixation (SIAF) system is investigated.<bold>Methods: </bold>A standard external fixation and a SIAF system were tested on pairs of Polyoxymethylene testing cylinders using a universal testing machine. Each specimen was subjected to a total of 2000 consecutive cyclic loadings at 1 Hz with sinusoidal lateral compression/distraction (+/-50 N) and torque (+/- 0.5 Nm) loading alternating every 200 cycles. Translational and rotational stiffness were determined at 100, 300, 500, 700 and 900 cycles.<bold>Results: </bold>There was no significant difference in translational stiffness between the SIAF and the standard external fixation when compared at 500 (p = .089), 700 (p = .081), and 900 (p = .266) cycles. Rotational stiffness observed for the SIAF was about 50 percent higher than the standard external fixation at 300 (p = .005), 500 (p = .020), and 900 (p = .005) cycles. No loosening or failure of the rod-pin/rod-screw interfaces was seen.<bold>Conclusions: </bold>In comparison with the standard external fixation system, the tested device for subcutaneous internal anterior fixation (SIAF) in vitro has similar translational and superior rotational stiffness.
- Publication
BMC Musculoskeletal Disorders, 2014, Vol 15, Issue 1, p111
- ISSN
1471-2474
- Publication type
journal article
- DOI
10.1186/1471-2474-15-111