PT - JOURNAL ARTICLE AU - Hu, Kong-Zu AU - Zhang, Xian-Long AU - Wang, Cheng-Tao AU - Ji, Wen-Ting TI - The contour of cementless femoral stem has minor effect on initial periprosthetic von Mises stress distribution. A 3-dimensional finite element analysis DP - 2009 Jul 01 TA - Saudi Medical Journal PG - 947--951 VI - 30 IP - 7 4099 - http://smj.org.sa/content/30/7/947.short 4100 - http://smj.org.sa/content/30/7/947.full SO - Saudi Med J2009 Jul 01; 30 AB - OBJECTIVE: To evaluate periprosthetic von Mises stress distribution with cementless femoral stems of various contours.METHODS: The study was carried out at the Department of Orthopaedics, Shanghai 6th Hospital, Shanghai, China between May 2008 and February 2009. Finite element models of proximal femoral replacement with 4 cementless stems (Alloclassic, Ribbed Anatomic, VerSys, and Securi-fit) of various contours were set up. Under the loading conditions of walking and stair climbing, 3-dimensional periprosthetic von Mises stresses were calculated, and the stress distribution patterns were compared.RESULTS: Periprosthetic stresses were increased in level 1, 2, and 3 under the 2 loading conditions, and more considerably in level 2 and 3. The stresses were higher on the medial side in all cases. No remarkable difference was found in the patterns between the 4 stems.CONCLUSION: The contour design of femoral stem has minor effect on initial periprosthetic von Mises stress distribution.