Stress shielding in periprosthetic bone following a total knee replacement: Effects of implant material,design and alignment |
| |
| Institution: | 1. Mechanical Behaviour of Materials Laboratory, School of Engineering, University of Portsmouth, Anglesea Road, Portsmouth PO1 3DJ, UK\n;2. Spires Portsmouth Hospital, Bartons Road, Havant PO9 5NP, UK;1. Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Malaysia;2. Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, Malaysia;3. Department of Civil Engineering, Aalborg University, Denmark;4. Department of Management and Engineering, University of Padova, Italy;1. Department of Orthopaedics, Orthopaedic Research Laboratory, University Medical Centre Nijmegen, Nijmegen, The Netherlands;2. Laboratory for Biomechanical Engineering, University of Twente, Enschede, The Netherlands;1. Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto M5S 3G9, ON, Canada;2. Department of Mechanical and Industrial Engineering, Ryerson University, Toronto M5B 2K3, ON, Canada;3. Martin Orthopaedic Biomechanics Laboratory, St. Michael''s Hospital, Toronto M5B 1W8, ON, Canada;4. Department of Mechanical and Industrial Engineering, University of Toronto, Toronto M5S 3G8, ON, Canada |
| |
| Abstract: | Periprosthetic bone strain distributions in some of the typical cases of total knee replacement (TKR) were studied with regard to the selection of material, design and the alignments of tibial components to examine which conditions are more forgiving than the others to stress shielding post a TKR. Four tibial components with two implant designs (cruciate sacrificing and cruciate retaining) and material properties (metal-backed (MB) and all-polyethylene (AP)) were considered in a specimen-specific finite element tibia bone model loaded in a neutral position. The influence of tibial material and design on the periprosthetic bone strain response was investigated under the peak loads of walking and stair descending/ascending. Two of the models were also modified to examine the effect of selected implant malalignment conditions (7° posterior, 5° valgus and 5° varus) on stress shielding in the bone, where the medio-lateral load share ratios were adjusted accordingly. The predicted increases of bone density due to implantation for the selected cases studied were also presented.For the cases examined, the effect of stress shielding on the periprosthetic bone seems to be more significantly influenced by the implant material than by the implant geometry. Significant stress shielding is found in MB cases, as opposed to increase in bone density found in AP cases, particularly in the bones immediately beneath the baseplate. The effect of stress shielding is reduced somewhat for the MB components in the malaligned positions compared with the neutral case. In AP cases, the effect of stress shielding is mostly low except in the varus position, possibly due to off-loading of lateral condyle. Increases in bone density are found in both MB and AP cases for the malaligned conditions. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
