[Translated article] Significant improvement in axial load stability with the pre-tensioned pelvic external fixator: A biomechanical analysis in a model with type C Tile lesion

• Published in: Revista española de cirugía ortopédica y traumatología Vol. 67; no. 2; pp. T125 - 133
• Main Authors: Durán Garrido, F J, Pérez de la Blanca, A, Lombardo Torre, M, Delgado Rufino, B, Peña Trabalón, A, Queipo de Llano Temboury, A
• Format: Journal Article
• Language: English; Spanish
• Published: Spain 01.03.2023
• Subjects: Biomechanical Phenomena; Bone Nails; External Fixators; Fracture Fixation; Fractures, Bone; Humans; Pelvic Bones - injuries; Pelvic Bones - surgery; Pelvis - injuries; Pelvis - surgery; Fijación externa; Fractura de pelvis; External fixation; Pelvis fracture; Fijador pretensado; Biomechanical study; Estudio biomecánico; Pre-tensed fixator
• ISSN: 1988-8856
• DOI: 10.1016/j.recot.2022.08.005

The aim of our work is to check if the use of a pre-tensed bar connected to 2 supra-acetabular Schanz pins is more stable in a pelvic with a tile C1 injury. We used synthetic pelvis (N = 5) with a unstable vertical injury, stabilized with both the standard and the pre-tensed system. They both were submitted to axial loading. We measured applied forces and the position of markers that were positioned in the sacroiliac and symphysis joints. We determined the relative movements between injured surfaces, rigidity, resistance and when each system failed. When using the pre-tensed fixator, the rigidity was much higher in the sacro-iliac joint(P=.043) being 3.45 times higher, being also 2.06 times higher in pubic symphysis (P=.043). The resistance against failure was 2 times higher too (P=.043). The increased axial stability with the pre-tensed external fixator accords with its ability to make active compression in both posterior and anterior elements of the pelvic ring, which was previously demonstrated. This result supports the preliminary clinic outcomes that were obtained. The pre-tensed external fixator increases the axial stability of the pelvic ring's posterior elements in a synthethic pelvis with a Tile C1 injury, without decreasing it's capacity to achieve an anterior stability.