Bone-Cement Interface Micromechanical Model under Cyclic Loading

2011 ◽  
Vol 488-489 ◽  
pp. 391-394
Author(s):  
J.A. Sanz-Herrera ◽  
H. Esteban ◽  
M.P. Ariza
Keyword(s):  
Bone Cement ◽  
Hip Replacement ◽  
Mechanical Characterization ◽  
Micromechanical Model ◽  
Volume Element ◽  
Implant Loosening ◽  
Cement Interface ◽  
Causes Of Failure ◽  
Interface Geometry

Total hip replacement is one of the most common techniques in orthopaedic surgery, and one of the most important surgical advances of the last XX century. Normally, implant is fixed to bone by means of a polymer material known as bone cement, building an interface between implant and bone regions. Microscopically, two interfaces can be distinguished, namely, bone-cement and implant-cement interfaces. One of the main causes of failure is implant loosening due to fatigue of one of the two microscopic interfaces. In this work, a micromechanical analysis of bone-cement interface under cyclic forces is introduced. Both bone and cement are considered using different models based on fatigue damage over a statistically representative volume element (RVE) of the microstructure. This technique allows to homogenize mechanical stresses of the RVE yielding the effective macroscopic behavior of the bone-cement interface, avoiding experimental fitting case to case, once the interface geometry and mechanical characterization of the involved phases are known.

Effect of Tapered Geometry on the Load Transfer of an Idealized Cemented Hip Implant

2002 ◽  
Author(s):  
N. Nun˜o
Keyword(s):  
Residual Stresses ◽  
Bone Cement ◽  
Chemical Bond ◽  
Load Transfer ◽  
Hip Implants ◽  
Implant Loosening ◽  
Cement Interface ◽  
Grouting Material ◽  
Surrounding Bone ◽  
Causes Of Failure

Implant loosening of cemented hip implants is one of the major causes of failure of the arthroplasty. In cemented hip implants, the polymethyl methacrylate (PMMA), also called bone cement, is used as grouting material between the stem and the surrounding bone. During polymerisation of the cement, residual stresses are generated in the bulk cement. The bone cement does not have a chemical bond with the stem nor the bone; however, it fills completely the space between the two and serves to distribute the load being transferred from the stem to the bone. Numerical analyses on the load transfer of cemented hip implants usually do not include the residual stresses due to cement curing at the stem-cement interface [1–2].

Formation of a synovial-like membrane at the bone-cement interface: Its role in bone resorption and implant loosening after total hip replacement

1986 ◽  
Vol 29 (7) ◽  
pp. 836-842 ◽  
Author(s):  
Steven R. Goldring ◽  
Murali Jasty ◽  
Merrilee S. Roelke ◽  
Carolyn M. Rourke ◽  
F. Richard Bringhurst ◽  
...  
Keyword(s):  
Bone Resorption ◽  
Bone Cement ◽  
Total Hip Replacement ◽  
Hip Replacement ◽  
Implant Loosening ◽  
Cement Interface ◽  
Total Hip

scholarly journals Reproduction of fretting wear at the stem—cement interface in total hip replacement

2007 ◽  
Vol 221 (8) ◽  
pp. 963-971 ◽  
Author(s):  
L Brown ◽  
H Zhang ◽  
L Blunt ◽  
S Barrans
Keyword(s):  
Bone Cement ◽  
Total Hip Replacement ◽  
Hip Replacement ◽  
Fatigue Cracks ◽  
Cement Mantle ◽  
Fretting Wear ◽  
Cement Interface ◽  
Total Hip

The stem-cement interface experiences fretting wear in vivo due to low-amplitude oscillatory micromotion under physiological loading, as a consequence it is considered to play an important part in the overall wear of cemented total hip replacement. Despite its potential significance, in-vitro simulation to reproduce fretting wear has seldom been attempted and even then with only limited success. In the present study, fretting wear was successfully reproduced at the stem-cement interface through an in-vitro wear simulation, which was performed in part with reference to ISO 7206-4: 2002. The wear locations compared well with the results of retrieval studies. There was no evidence of bone cement transfer films on the stem surface and no fatigue cracks in the cement mantle. The cement surface was severely damaged in those areas in contact with the fretting zones on the stem surface, with retention of cement debris in the micropores. Furthermore, it was suggested that these micropores contributed to initiation and propagation of fretting wear. This study gave scope for further comparative study of the influence of stem geometry, stem surface finish, and bone cement brand on generation of fretting wear.

Effect of Tapered Geometry on the Load Transfer of an Idealized Cemented Hip Implant

2002 ◽  
Author(s):  
N. Nun˜o
Keyword(s):  
Residual Stresses ◽  
Bone Cement ◽  
Chemical Bond ◽  
Polymethyl Methacrylate ◽  
Load Transfer ◽  
Hip Implants ◽  
Cement Interface ◽  
Grouting Material ◽  
Surrounding Bone ◽  
Causes Of Failure

Implant looseining of cemented hip implants is one of the major causes of failure of the arthroplasty. In cemented hip implants, the polymethyl methacrylate (PMMA), also called bone cement, is used as grouting material between the stem and the surrounding bone. During polymerisation of the cement, residual stresses are generated in the bulk cement. The bone cement does not have a chemical bond with the stem nor the bone; however, it fills completely the space between the two and serves to distribute the load being transferred from the stem to the bone. Numerical analyses on the load transfer of cemented hip implants usually do not include the residual stresses due to cement curing at the stem-cement interface [1–2].

Changes in the bone-cement interface after total hip replacement. An in vivo animal study.

1982 ◽  
Vol 64 (8) ◽  
pp. 1188-1200 ◽  
Author(s):  
E L Radin ◽  
C T Rubin ◽  
E L Thrasher ◽  
L E Lanyon ◽  
A M Crugnola ◽  
...  
Keyword(s):  
Bone Cement ◽  
Animal Study ◽  
Total Hip Replacement ◽  
Hip Replacement ◽  
Cement Interface ◽  
Total Hip

The Influence of Cementing Technique and Blood on the Strength of the Bone-Cement Interface

1988 ◽  
Vol 17 (3) ◽  
pp. 131-133 ◽  
Author(s):  
G C Bannister ◽  
A W Miles
Keyword(s):  
Bone Cement ◽  
Hip Replacement ◽  
Interface Strength ◽  
Femoral Bone ◽  
Cementing Technique ◽  
Cement Interface ◽  
Bone Fixation ◽  
Lower Viscosity ◽  
Human Material ◽  
Cementing Techniques

The shear strength of the femoral bone-cement interface using four current techniques of cement insertion in total hip replacement was compared in paired human and ox femora. Ox bone proved to have mechanical properties comparable to human material, gave reproducible results, and was more readily available. In clean bone, lowering cement viscosity resulted in better bone fixation. When a thin layer of blood was interposed on brushed, washed bone, the interface strength was halved. Lower viscosity cementing techniques in the presence of blood conferred no advantage over cement inserted as thick dough.

En-bloc femoral cement removal after failure of cemented total hip replacement in two dogs

2013 ◽  
Vol 26 (02) ◽  
pp. 130-134 ◽  
Author(s):  
J. Song ◽  
J. G. Sheehy ◽  
J. Dyce
Keyword(s):  
Bone Cement ◽  
Total Hip Replacement ◽  
Hip Replacement ◽  
Periprosthetic Infection ◽  
Cement Mantle ◽  
Femoral Bone ◽  
En Bloc ◽  
Cement Interface ◽  
Total Hip ◽  
Cement Removal

SummaryIn two dogs with periprosthetic infection after total hip replacement, the femoral cement mantle was retrieved by proximal extraction without an invasive osteotomy or cortical fenestration. En-bloc femoral cement removal was performed by injection of polymethylmethacrylate cement into the central mantle void left after stem removal, and by threading a positive profile pin into the newly injected cement. Once the PMMA had polymerized, the pin was withdrawn with the entire mantle attached. This technique should be considered in patients with circumferential deterioration of the femoral bone-cement interface in which the diameter of the femoral isthmus would not obstruct withdrawal of the cement mantle.

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