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European Journal of Orthopaedic Surgery & Traumatology

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01-12-2015 | Original Article • HIP - ARTHROPLASTY

Influence of cup-center-edge angle on micro-motion at the interface between the cup and host bone in cementless total hip arthroplasty: three-dimensional finite element analysis

Authors: Nobuhiro Kaku, Tomonori Tabata, Hiroshi Tsumura

Published in: European Journal of Orthopaedic Surgery & Traumatology | Issue 8/2015

Abstract

We verified the index cup position required for bulk bone grafting instead of morcellized grafting immediately after cementless total hip arthroplasty. Three-dimensional finite element analysis was used to evaluate changes in the volume of the slippage of the cup–host bone interface as micro-motion of the cup at the acetabular bone defect site depending on the cup-center-edge (CE) angle. The conditions of bulk bone grafts were similar to those of cortical bone. Slippage increased with decreasing cup-CE angle. A bulk bone graft tightly fixed to the host bone prevented considerably larger slippage between the cup and host bone. A smaller cup-CE angle increased the impact of the bulk bone graft on slippage. When the cup-CE angle was 0° or −10°, the criterion for slippage in favorable initial fixation in all conditions was <40 μm. Even if transplanted bulk bone is used, unless good fixation is obtained between the host bone, and the cup and bone graft, it is impossible to obtain reliable fixation of the cup with a cup-CE angle <−10° and slippage exceeding 40 μm. Bulk bone grafting tightly fixed to the host bone improves initial the cup–host bone fixation, especially when the cup-CE angle is small, such as <−10°. In clinical practice, negative factors are implicated in the initial fixation of various cups, and sufficient fixation between the host bone and cup or bulk bone graft using a screw is effective when the cup-CE angle is extremely small.

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Title: Influence of cup-center-edge angle on micro-motion at the interface between the cup and host bone in cementless total hip arthroplasty: three-dimensional finite element analysis
Authors: Nobuhiro Kaku
Tomonori Tabata
Hiroshi Tsumura
Publication date: 01-12-2015
Publisher: Springer Paris
Published in: European Journal of Orthopaedic Surgery & Traumatology / Issue 8/2015
Print ISSN: 1633-8065
Electronic ISSN: 1432-1068
DOI: https://doi.org/10.1007/s00590-015-1697-z

At a glance: The STEP trials

Springer Medicine

Influence of cup-center-edge angle on micro-motion at the interface between the cup and host bone in cementless total hip arthroplasty: three-dimensional finite element analysis

Abstract

At a glance: The STEP trials

Springer Medicine

Abstract

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