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Open AccessArticle

Development of a Novel in Silico Model to Investigate the Influence of Radial Clearance on the Acetabular Cup Contact Pressure in Hip Implants

1
Laboratorio di Tecnologia Medica, IRCCS—Istituto Ortopedico Rizzoli, 40136 Bologna, Italy
2
Department of Industrial Engineering, University of Salerno, 84084 Salerno, Italy
*
Author to whom correspondence should be addressed.
Materials 2018, 11(8), 1282; https://doi.org/10.3390/ma11081282
Received: 18 June 2018 / Revised: 19 July 2018 / Accepted: 20 July 2018 / Published: 25 July 2018
A hip joint replacement is considered one of the most successful orthopedic surgical procedures although it involves challenges that must be overcome. The patient group undergoing total hip arthroplasty now includes younger and more active patients who require a broad range of motion and a longer service lifetime of the implant. The current replacement joint results are not fully satisfactory for these patients’ demands. As particle release is one of the main issues, pre-clinical experimental wear testing of total hip replacement components is an invaluable tool for evaluating new implant designs and materials. The aim of the study was to investigate the cup tensional state by varying the clearance between head and cup. For doing this we use a novel hard-on-soft finite element model with kinematic and dynamic conditions calculated from a musculoskeletal multibody model during the gait. Four different usual radial clearances were considered, ranging from 0 to 0.5 mm. The results showed that radial clearance plays a key role in acetabular cup stress-strain during the gait, showing from the 0 value to the highest, 0.5, a difference of 44% and 35% in terms of maximum pressure and deformation, respectively. Moreover, the presented model could be usefully exploited for complete elastohydrodynamic synovial lubrication modelling of the joint, with the aim of moving towards an increasingly realistic total hip arthroplasty in silico wear assessment accounting for differences in radial clearances. View Full-Text
Keywords: finite element analysis; total hip arthroplasty; UHMWPE; musculoskeletal multibody model; tribology finite element analysis; total hip arthroplasty; UHMWPE; musculoskeletal multibody model; tribology
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Affatato, S.; Merola, M.; Ruggiero, A. Development of a Novel in Silico Model to Investigate the Influence of Radial Clearance on the Acetabular Cup Contact Pressure in Hip Implants. Materials 2018, 11, 1282.

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