Abstract
Primary stability has a great influence on behaviour during day-to-day activities and on the long-term success of uncemented acetabular components. Achieving this stability by pushing the acetabular bush (uncemented fixation) is a common practice today. In this paper, it was tried to establish a criterion for the success of fixing the acetabular cup by evaluating the short-term stability. The influence of the contact parameters established between the cup and the peripheral area of the acetabulum was investigated in this paper. These parameters depend on the intraoperative procedures: reaming and fixation. Reaming is considered without residual stress, but the acetabulum has been remodelled (a sphere has been adapted through an optimization algorithm). Uncemented fixation (press fit) involves a series of load impulses applied to the cup, simulating the impact strokes through the surgeon’s hammer. Finite Element Method (FEM) was used for this simulation along with a pelvis model based on computed tomography (CT) data. Consequently, there is a postoperative state of residual effort. Assessing this state of effort could lead to a good estimation of short-term stability.
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