dc.contributor.author |
Munro, Jacob |
en |
dc.contributor.author |
Millar, JS |
en |
dc.contributor.author |
Fernandez, Justin |
en |
dc.contributor.author |
Walker, Cameron |
en |
dc.contributor.author |
Howie, DW |
en |
dc.contributor.author |
Shim, Bo |
en |
dc.date.accessioned |
2020-09-17T21:48:45Z |
en |
dc.date.available |
2020-09-17T21:48:45Z |
en |
dc.date.issued |
2018-11 |
en |
dc.identifier.issn |
2049-4394 |
en |
dc.identifier.uri |
http://hdl.handle.net/2292/52942 |
en |
dc.description.abstract |
AIMS:Osteolysis, secondary to local and systemic physiological effects, is a major challenge in total hip arthroplasty (THA). While osteolytic defects are commonly observed in long-term follow-up, how such lesions alter the distribution of stress is unclear. The aim of this study was to quantitatively describe the biomechanical implication of such lesions by performing subject-specific finite-element (FE) analysis on patients with osteolysis after THA. PATIENTS AND METHODS:A total of 22 hemipelvis FE models were constructed in order to assess the transfer of load in 11 patients with osteolysis around the acetabular component of a THA during slow walking and a fall onto the side. There were nine men and two women. Their mean age was 69 years (55 to 81) at final follow-up. Changes in peak stress values and loads to fracture in the presence of the osteolytic defects were measured. RESULTS:The von Mises stresses were increased in models of those with and those without defects for both loading scenarios. Although some regions showed increases in stress values of up to 100%, there was only a moderate 11.2% increase in von Mises stress in the series as a whole. The site of fracture changed in some models with lowering of the load to fracture by 500 N. The most common site of fracture was the pubic ramus. This was more frequent in models with larger defects. CONCLUSION:We conclude that cancellous defects cause increases in stress within cortical structures. However, these are likely to lead to a modest decrease in the load to fracture if the defect is large (> 20cm3) or if the patient is small with thin cortical structures and low bone mineral density. Cite this article: Bone Joint J 2018;100-B:1455-62. |
en |
dc.format.medium |
Print |
en |
dc.language |
eng |
en |
dc.relation.ispartofseries |
The bone & joint journal |
en |
dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. |
en |
dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
en |
dc.subject |
Acetabulum |
en |
dc.subject |
Pubic Bone |
en |
dc.subject |
Humans |
en |
dc.subject |
Osteolysis |
en |
dc.subject |
Postoperative Complications |
en |
dc.subject |
Tomography, Spiral Computed |
en |
dc.subject |
Walking |
en |
dc.subject |
Arthroplasty, Replacement, Hip |
en |
dc.subject |
Follow-Up Studies |
en |
dc.subject |
Accidental Falls |
en |
dc.subject |
Finite Element Analysis |
en |
dc.subject |
Stress, Mechanical |
en |
dc.subject |
Weight-Bearing |
en |
dc.subject |
Models, Anatomic |
en |
dc.subject |
Aged |
en |
dc.subject |
Aged, 80 and over |
en |
dc.subject |
Middle Aged |
en |
dc.subject |
Female |
en |
dc.subject |
Male |
en |
dc.subject |
Periprosthetic Fractures |
en |
dc.title |
Risk analysis of patients with an osteolytic acetabular defect after total hip arthroplasty using subject-specific finite-element modelling. |
en |
dc.type |
Journal Article |
en |
dc.identifier.doi |
10.1302/0301-620x.100b11.bjj-2018-0092.r2 |
en |
pubs.issue |
11 |
en |
pubs.begin-page |
1455 |
en |
pubs.volume |
100-B |
en |
dc.rights.holder |
Copyright: The author |
en |
pubs.end-page |
1462 |
en |
pubs.publication-status |
Published |
en |
dc.rights.accessrights |
http://purl.org/eprint/accessRights/RestrictedAccess |
en |
pubs.subtype |
Journal Article |
en |
pubs.elements-id |
757044 |
en |
pubs.org-id |
Bioengineering Institute |
en |
pubs.org-id |
ABI Associates |
en |
pubs.org-id |
Engineering |
en |
pubs.org-id |
Engineering Science |
en |
pubs.org-id |
Medical and Health Sciences |
en |
pubs.org-id |
School of Medicine |
en |
pubs.org-id |
Surgery Department |
en |
dc.identifier.eissn |
2049-4408 |
en |
pubs.record-created-at-source-date |
2018-11-13 |
en |
pubs.dimensions-id |
30418069 |
en |