Microseparation of the centers of alumina-alumina artificial hip joints during simulator testing produces clinically relevant wear rates and patterns

2000 ◽  
Vol 15 (6) ◽  
pp. 793-795 ◽  
Author(s):  
J. Nevelos ◽  
E. Ingham ◽  
C. Doyle ◽  
R. Streicher ◽  
A. Nevelos ◽  
...  
Keyword(s):  
Hip Joints ◽  
Wear Rates ◽  
Artificial Hip ◽  
Artificial Hip Joints

Wear and deformation of ceramic-on-polyethylene total hip replacements with joint laxity and swing phase microseparation

2003 ◽  
Vol 217 (2) ◽  
pp. 147-153 ◽  
Author(s):  
S Williams ◽  
M Butterfield ◽  
T Stewart ◽  
E Ingham ◽  
M Stone ◽  
...  
Keyword(s):  
Volume Change ◽  
Swing Phase ◽  
Joint Laxity ◽  
Acetabular Cup ◽  
Hip Joints ◽  
Wear Rates ◽  
Ceramic Femoral Head ◽  
Artificial Hip ◽  
Artificial Hip Joints

Wear of polyethylene and the resulting wear debris-induced osteolysis remains a major cause of long-term failure in artificial hip joints. There is interest in understanding engineering and clinical conditions that influence wear rates. Fluoroscopic studies have shown separation of the head and the cup during the swing phase of walking due to joint laxity. In ceramic-on-ceramic hips, joint laxity and microseparation, which leads to contact of the head on the superior rim of the cup, has led to localized damage and increased wear in vivo and in vitro. The aim of this study was to investigate the influence of joint laxity and microseparation on the wear of ceramic on polyethylene artificial hip joints in an in vitro simulator. Microseparation during the swing phase of the walking cycle produced contact of the ceramic head on the rim of the polyethylene acetabular cup that deformed the softer polyethylene cup. No damage to the alumina ceramic femoral head was found. Under standard simulator conditions the volume change of the moderately crosslinked polyethylene cups was 25.6 ± 5.3 mm3/million cycles and this reduced to 5.6 ± 4.2 mm3/million cycles under microseparation conditions. Testing under microseparation conditions caused the rim of the polyethylene cup to deform locally, possibly due to creep, and the volume change of the polyethylene cup when the head relocated was substantially reduced, possibly due to improved lubrication. Joint laxity may be caused by poor soft tissue tension or migration and subsidence of components. In ceramic-on-polyethylene acetabular cups wear was decreased with a small degree of joint laxity, while in contrast in hard-on-hard alumina bearings, microseparation accelerated wear. These findings may have significant implications for the choice of fixation systems to be used for different types of bearing couples.

scholarly journals Influence of Metallic Deposition on Ceramic Femoral Heads on the Wear Behavior of Artificial Hip Joints: A Simulator Study

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3569
Author(s):  
Jessica Hembus ◽  
Lisa Rößler ◽  
Mario Jackszis ◽  
Annett Klinder ◽  
Rainer Bader ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Wear Behavior ◽  
Laser Scanning Microscopy ◽  
Wear Testing ◽  
Hip Joints ◽  
Wear Rates ◽  
Artificial Hip ◽  
Femoral Heads ◽  
Wear Simulator ◽  
Artificial Hip Joints

Several retrieval studies have reported on metallic depositions on ceramic femoral heads, but the effect on the wear behavior of artificial hip joints has not been investigated in wear simulator studies. In the present study, retrieved ceramic heads with metallic depositions as third particles were tested against cross-linked ultra-high-molecular-weight polyethylene (UHMWPE) liners in a hip wear simulator. The amount of liner wear and expansion of metallic depositions on the heads were determined before and after wear testing with digital microscopy. The surface roughness of the heads was investigated in areas with and without metallic depositions by laser scanning microscopy. After five million load cycles, a non-significant reduction in the metallic formation on the retrieved heads was found. The metallic areas showed a higher surface roughness compared to unconcerned areas. The liners showed a higher wear rate of 1.57 ± 1.36 mg/million cycles for 28 mm heads and 2.42 ± 0.82 mg/million cycles for 36 mm heads with metallic depositions, in comparison with new ceramic heads with a 28 mm size ((−0.06 ± 0.89) mg/million cycles) and 36 mm size ((2.04 ± 0.46) mg/million cycles). Metallic transfer on ceramic heads can lead to an increased surface roughness and higher wear rates at the UHMWPE liners. Therefore, metallic contact of the ceramic femoral head should be avoided.

The influence of phospholipid concentration in protein-containing lubricants on the wear of ultra-high molecular weight polyethylene in artificial hip joints

2001 ◽  
Vol 215 (2) ◽  
pp. 259-263 ◽  
Author(s):  
J Bell ◽  
J L Tipper ◽  
E Ingham ◽  
M H Stone ◽  
J Fisher
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Phosphatidyl Choline ◽  
Bovine Serum ◽  
Hip Joints ◽  
Wear Rates ◽  
Artificial Hip ◽  
Artificial Hip Joints ◽  
Ultra High Molecular Weight

There is considerable interest in the wear of polyethylene and the resulting wear-debrisinduced osteolysis in artificial hip joints. Proteins play an important role as boundary lubricants in vivo in the pseudosynovial fluid, and these are reproduced in in vitro tests through the use of bovine serum. Little is known, however, about the effect of phospholipid concentrations within proteinaceous solutions on the wear of ultra-high molecular weight polyethylene (UHMWPE). The effects of protein-containing lubricants with 0.05, 0.5 and 5 per cent (w/v) phosphatidyl choline concentrations on the wear of ultra-high molecular weight polyethylene (UHMWPE) were compared with 25 per cent (v/v) bovine serum which had 0.01 per cent (w/v) lipid; the effects were compared in a hip joint simulator with smooth (n = 4) and scratched (n = 3) femoral heads. The control bovine serum lubricant produced UHWMPE wear of 55 and 115mm3/106 cycles on the smooth and rough heads respectively. The increased phospholipid concentration significantly reduced the wear rate. At the higher concentration (5% w/v phosphatidyl choline) the average wear was reduced to less than 2 mm3/106 cycles. Even with the relatively low concentrations of 0.05% w/v phosphatidyl choline the wear was reduced by at least threefold compared with the bovine serum tests for both the smooth and rough femoral heads. There may be considerable differences in the phospholipid concentrations in patients' synovial fluid and this is highly likely to produce considerable variation in wear rates. In vitro, differences in the phospholipid concentration of lubricants may also cause variation in wear rates between different simulator tests.

Metal-On-Metal Articulation for Artificial Hip Joints: Laboratory Study and Clinical Results

1996 ◽  
Vol 210 (3) ◽  
pp. 223-232 ◽  
Author(s):  
R M Streicher ◽  
M Semlitsch ◽  
R Schön ◽  
H Weber ◽  
C Rieker
Keyword(s):  
Hip Joint ◽  
Laboratory Data ◽  
Clinical Results ◽  
Hip Joints ◽  
Wear Rates ◽  
Metal On Metal ◽  
Artificial Hip ◽  
Artificial Joint Replacement ◽  
Artificial Hip Joints ◽  
Screening Device

As wear is inevitable with artificial joint replacement, it has to be minimized to avoid possible aseptic loosening following osteolysis due to particle-initiated foreign body reaction. Co-Cr-Mo-C alloys have a long history with only minimum wear when articulating with themselves. This investigation shows that the choice of the alloy has an effect on the wear rate of this articulation couple. Tribological studies in a screening device, a pendulum apparatus and a hip joint simulator showed a marked influence of the environment as well as the diameter of the implants with metal-on-metal articulation. A wear-resistant combination with low friction characteristics has been developed by using a wrought Co-Cr-Mo-C alloy and reducing the implant diameter to 28 mm. Clinical wear rates are comparable with laboratory data and demonstrate the potential of the metal-on-metal articulation to solve the problem of wear-induced osteolysis of hip joint endoprostheses.

A Model on the Motion of Wear Particles in the Synovial Fluid of an Artificial Hip Joint

2009 ◽  
Author(s):  
Sunny M. Jhurani ◽  
C. Fred Higgs
Keyword(s):  
Synovial Fluid ◽  
Submicron Particles ◽  
Hip Joints ◽  
Wear Rates ◽  
Macrophage Activity ◽  
Artificial Hip Joint ◽  
Pmma Bone Cement ◽  
Artificial Hip ◽  
Artificial Hip Joints ◽  
Ultra High Molecular Weight

Improvements in surgical procedures, installation techniques and properties of materials have resulted in a remarkable reduction in the failure of artificial hip joints (AHJ) due to infection. However, the durability of these replacements is greatly limited by premature osteolysis and eventual joint loosening, caused by macrophage activity in response to the release of submicron particles of ultra-high molecular weight polyethylene (UHMWPE) cup material [1–4]. The wear debris is mainly due to wear between the bearing surfaces, and these wear rates are known to be accelerated by the third body action of polymethylmethacrylate (PMMA) bone cement particles and metallic fragments of the femoral head material scattered within the synovial fluid lubricant [5]. This study is focused on development of a model that simulates the motion of UHMWPE particles in the synovial fluid between the AHJ bearing surfaces during articulation.

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