title: Total hip arthroplasty by using a cementless ultrashort stem: a subject-specific finite element analysis for a young patient clinical case.
abstract: In this article, a subject-specific finite element analysis has been developed to study a clinical case of a surgically misaligned hip prosthesis with an ultrashort stem. It was set out to study the strain energy density pattern, comparing the results obtained with computed tomography images. The authors developed two other numerical models: the first one analyzes the stress and strain distributions in the healthy femur (without prosthesis) and the second one analyzes the same boneimplant biomechanical system of the clinical case but assuming the prosthesis in the proper position. The misaligned prosthesis produced an overload at the proximal posterior plane of the femur, as confirmed by computed tomography images, which detect the formation of new bone. The numerical model of the correctly positioned prosthesis demonstrated that the bone is not overloaded and that the position of neutral axis does not significantly shift from the physiological condition.
authors: Department of Electronic Engineering, Chemistry and Industrial Engineering, University of Messina, Messina, Italy. gabriella.epasto@unime.it
authors: Gabriella
authors: G
authors: Epasto
authors: Albina
authors: A
authors: Foti
authors: Eugenio
authors: E
authors: Guglielmino
authors: Michele A
authors: MA
authors: Rosa
mesh_terms: D000328:Adult; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D001696:Biomechanical Phenomena; D005260:Female; D005269:Femur / Q000033:anatomy & histology / Q000502:physiology; D020342:Finite Element Analysis; D006622:Hip Prosthesis; D006801:Humans; D021621:Imaging, Three-Dimensional; D019300:Medical Errors; D008954:Models, Biological; D018482:Muscle, Skeletal / Q000502:physiology; D016059:Range of Motion, Articular; D013314:Stress, Mechanical; D014057:Tomography, X-Ray Computed
keywords: Biomechanics; computed tomography; finite element analysis; orthopedics; short-stemmed implant; total hip arthroplasty