naa a22 4500 510818587 CHVBK 20180411083520.0 cr unu---uuuuu 180411e20130801xx s 000 0 eng 10.1007/s12306-012-0234-z doi (NATIONALLICENCE)springer-10.1007/s12306-012-0234-z Biomechanical assays for the study of the effects of hip prostheses: application to the reconstruction of bone defects with femoral allografts [Elektronische Daten] [Alberto Francés, Rafael Claramunt, Juan-Luis Cebrian, Fernando Marco, Yaiza Lópiz, Ramon Rullanç, Antonio Ros, Luis López-Durán] There is a need to study and validate the mechanical behavior of the bone-implant total hip prosthesis and the treatment of its complications with experimental studies due to the limitations showed by numerical methods. Epoxy resin replicas of a femur (stereolithography) and a mechanical validation were performed. We studied three cases: intact femur (Case 1); non-defective femur with non-cemented LD primary stem (Case 2); and femur with a cavitary defect, short cemented stem over an impacted allograft (Case 3). The test pieces were connected to 7 strain gauges. Three assays per piece were carried out with a vertical and oblique load (load-unload curves after a sequence between 0 and 145.9N). We measured the k coefficient (distance from the natural state of the strains) and stability of the stem (flexion-compression by strain gauges 1, 2, 5, and 7 and transversal lengthening by strain gauges 3, 4, and 6). Results of the strain gauge analysis revealed linearity of results in all cases, and more so in load than in unload. Gauge 7 (proximal) revealed shortening in all cases. Gauges 2 and 5 provided qualitatively similar data due to a significant increase in rigidity. K coefficients were obtained with a nonsignificant difference when each of the test pieces was compared with Case 2. The results were reproducible in all 7 gauges. Observation of the load-unload curves in all the test pieces assayed shows that there are no variations in the pattern of behavior (when comparing the stability of a primary stem and a stem in the simulated reconstructed femoral defect. If these reconstructions are considered theoretically appropriate for giving primary stability to the stem—a sine qua non for the success of replacement surgery—then our study is novel. Istituti Ortopedici Rizzoli, 2012 Stereolithography nationallicence Photoelasticity nationallicence Strain gauge analysis nationallicence Revision hip arthroplasty nationallicence Francés Alberto Servicio de Cirugía Ortopédica y Traumatología, Hospital Clínico San Carlos, C/Río Pisuerga n° 16, Boadilla del Monte, 28669, Madrid, Spain aut Claramunt Rafael Departamento de Mecánica Estructural, ETSI Industriales, Universidad Politécnica de Madrid, Madrid, Spain aut Cebrian Juan-Luis Servicio de Cirugía Ortopédica y Traumatología, Hospital Clínico San Carlos, C/Río Pisuerga n° 16, Boadilla del Monte, 28669, Madrid, Spain aut Marco Fernando Servicio de Cirugía Ortopédica y Traumatología, Hospital Clínico San Carlos, C/Río Pisuerga n° 16, Boadilla del Monte, 28669, Madrid, Spain aut Lópiz Yaiza Servicio de Cirugía Ortopédica y Traumatología, Hospital Clínico San Carlos, C/Río Pisuerga n° 16, Boadilla del Monte, 28669, Madrid, Spain aut Rullanç Ramon Servicio de Cirugía Ortopédica y Traumatología, Hospital Clínico San Carlos, C/Río Pisuerga n° 16, Boadilla del Monte, 28669, Madrid, Spain aut Ros Antonio Departamento de Mecánica Estructural, ETSI Industriales, Universidad Politécnica de Madrid, Madrid, Spain aut López-Durán Luis Servicio de Cirugía Ortopédica y Traumatología, Hospital Clínico San Carlos, C/Río Pisuerga n° 16, Boadilla del Monte, 28669, Madrid, Spain aut MUSCULOSKELETAL SURGERY Springer Milan 97/2(2013-08-01), 123-130 2035-5106 97:2<123 2013 97 12306 https://doi.org/10.1007/s12306-012-0234-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12306-012-0234-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Francés Alberto Servicio de Cirugía Ortopédica y Traumatología, Hospital Clínico San Carlos, C/Río Pisuerga n° 16, Boadilla del Monte, 28669, Madrid, Spain aut NATIONALLICENCE 700 1- Claramunt Rafael Departamento de Mecánica Estructural, ETSI Industriales, Universidad Politécnica de Madrid, Madrid, Spain aut NATIONALLICENCE 700 1- Cebrian Juan-Luis Servicio de Cirugía Ortopédica y Traumatología, Hospital Clínico San Carlos, C/Río Pisuerga n° 16, Boadilla del Monte, 28669, Madrid, Spain aut NATIONALLICENCE 700 1- Marco Fernando Servicio de Cirugía Ortopédica y Traumatología, Hospital Clínico San Carlos, C/Río Pisuerga n° 16, Boadilla del Monte, 28669, Madrid, Spain aut NATIONALLICENCE 700 1- Lópiz Yaiza Servicio de Cirugía Ortopédica y Traumatología, Hospital Clínico San Carlos, C/Río Pisuerga n° 16, Boadilla del Monte, 28669, Madrid, Spain aut NATIONALLICENCE 700 1- Rullanç Ramon Servicio de Cirugía Ortopédica y Traumatología, Hospital Clínico San Carlos, C/Río Pisuerga n° 16, Boadilla del Monte, 28669, Madrid, Spain aut NATIONALLICENCE 700 1- Ros Antonio Departamento de Mecánica Estructural, ETSI Industriales, Universidad Politécnica de Madrid, Madrid, Spain aut NATIONALLICENCE 700 1- López-Durán Luis Servicio de Cirugía Ortopédica y Traumatología, Hospital Clínico San Carlos, C/Río Pisuerga n° 16, Boadilla del Monte, 28669, Madrid, Spain aut NATIONALLICENCE 773 0- MUSCULOSKELETAL SURGERY Springer Milan 97/2(2013-08-01), 123-130 2035-5106 97:2<123 2013 97 12306 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer