K Hu1, X Zhang, J Zhu, C Wang, W Ji, X Bai. 1. Department of Orthopaedic Surgery, The 6th Shanghai People's Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, People's Republic of China.
Abstract
BACKGROUND: Many contour designs have been developed to improve the femoral stem in cementless total hip arthroplasty. AIMS: To assess the initial interfacial micromotion and stress distribution. METHODS: The prosthesis-bone interfacial micromotions and stress distributions of four commonly used femoral stems were assessed by finite element simulation: Alloclassic, Ribbed Anatomic, VerSys, and Secur-Fit. The proximal interfacial micromotions and stress distributions were calculated under the loading conditions of stair climbing. Three-dimensional micromotions were calculated in three proximal sections distal to the osteotomy level with 400 mm between each section. Medial, anterior, lateral and posterior points in each section were selected for calculations. RESULTS: The micromotions were <100 microm at all the selected points. Significant stress was detected along the sharp corners and ribs of the Alloclassic and Ribbed Anatomic stems, respectively. CONCLUSIONS: Significant stresses are associated with the stems with sharp edges.
BACKGROUND: Many contour designs have been developed to improve the femoral stem in cementless total hip arthroplasty. AIMS: To assess the initial interfacial micromotion and stress distribution. METHODS: The prosthesis-bone interfacial micromotions and stress distributions of four commonly used femoral stems were assessed by finite element simulation: Alloclassic, Ribbed Anatomic, VerSys, and Secur-Fit. The proximal interfacial micromotions and stress distributions were calculated under the loading conditions of stair climbing. Three-dimensional micromotions were calculated in three proximal sections distal to the osteotomy level with 400 mm between each section. Medial, anterior, lateral and posterior points in each section were selected for calculations. RESULTS: The micromotions were <100 microm at all the selected points. Significant stress was detected along the sharp corners and ribs of the Alloclassic and Ribbed Anatomic stems, respectively. CONCLUSIONS: Significant stresses are associated with the stems with sharp edges.
Authors: Amanda D Marshall; Jeffrey G Mokris; Richard D Reitman; Alicia Dandar; David R Mauerhan Journal: J Arthroplasty Date: 2004-08 Impact factor: 4.757
Authors: Martin Lindberg-Larsen; Christoffer C Jørgensen; Søren Solgaard; Anne G Kjersgaard; Henrik Kehlet Journal: Acta Orthop Date: 2017-03-14 Impact factor: 3.717