Hip joint contact forces in normal subjects and subjects with total hip prostheses: walking and stair and ramp negotiation

2002 ◽  
Vol 17 (2) ◽  
pp. 130-139 ◽  
Author(s):  
B.W Stansfield ◽  
A.C Nicol
Keyword(s):  
Hip Joint ◽  
Normal Subjects ◽  
Contact Forces ◽  
Hip Prostheses ◽  
Total Hip ◽  
Joint Contact ◽  
Total Hip Prostheses

A Three-Axis Hip Joint Simulator for Wear and Friction Studies on Total Hip Prostheses

1996 ◽  
Vol 210 (3) ◽  
pp. 175-185 ◽  
Author(s):  
Vesa O Saikko
Keyword(s):  
Hip Joint ◽  
External Rotation ◽  
Frictional Torque ◽  
Hip Prostheses ◽  
Total Hip ◽  
Flexion Extension ◽  
Single Station ◽  
Wear And Friction ◽  
Total Hip Prostheses ◽  
Hip Joint Simulator

A three-axial, single-station hip joint simulator was designed and built for wear and friction studies on total hip prostheses. The design of the apparatus is described in detail. Continuous level walking is simulated. All three motion components, flexion-extension, abduction-adduction and internal-external rotation, are included. The motions are implemented electromechanically and the uniaxial load pneumatically. The load is measured continuously. For accurate measurement of wear, the apparatus has a loaded control joint, which also renders both the test and control joints self-centring, as they are loaded in series. The frictional torque of the test joint can be measured continuously throughout the wear test, which is an exceptional feature. Four tests of five million cycles each were completed using 32 mm diameter Co-Cr-Mo femoral heads and 5.6 mm thick, metal-backed, ultra-high molecular weight polyethylene acetabular cups as test specimens. Their wear and friction behaviour is described and discussed in relation to previous simulator studies and clinical observations. The lubricant was distilled water, maintained at body temperature. The wear of the cups was measured gravimetrically at intervals. The average wear rate was 3.9 mg/one million cycles, corresponding to 0.03 mm/year, and the average coefficient of friction was 0.01.

Analysis of surface stresses for the tribological system in total hip prostheses

2006 ◽  
Vol 39 ◽  
pp. S529
Author(s):  
B.-A. Behrens ◽  
G. Helms ◽  
O. Pösse ◽  
I. Nolte ◽  
A. Meyer-Lindenberg ◽  
...  
Keyword(s):  
Hip Prostheses ◽  
Total Hip ◽  
Surface Stresses ◽  
Tribological System ◽  
Total Hip Prostheses

scholarly journals Numerical investigations of stress shielding in total hip prostheses

2008 ◽  
Vol 222 (5) ◽  
pp. 593-600 ◽  
Author(s):  
B-A Behrens ◽  
C J Wirth ◽  
H Windhagen ◽  
I Nolte ◽  
A Meyer-Lindenberg ◽  
...  
Keyword(s):  
Stress Shielding ◽  
Hip Prostheses ◽  
Numerical Investigations ◽  
Total Hip ◽  
Total Hip Prostheses

Clinical, Radiographic, and Scintigraphic Comparison of the Mechanical Stability of Mueller and Zweymueller Total Hip Prostheses

Orthopedics ◽  
1999 ◽  
Vol 22 (11) ◽  
pp. 1037-1043
Author(s):  
Marios Stamatakis ◽  
Panagiotis Korovessis ◽  
Anna Mastorakou ◽  
Maria Profanti ◽  
Panagiotis N Soukakos
Keyword(s):  
Mechanical Stability ◽  
Hip Prostheses ◽  
Total Hip ◽  
Total Hip Prostheses

scholarly journals Total Hip Prostheses in Standing, Sitting and Squatting Positions: An Overview of Our 8 Years Practice Using the EOS Imaging Technology

2015 ◽  
Vol 9 (1) ◽  
pp. 26-44 ◽  
Author(s):  
Jean-Yves Lazennec ◽  
Marc-Antoine Rousseau ◽  
Adrien Brusson ◽  
Dominique Folinais ◽  
Maria Amel ◽  
...  
Keyword(s):  
Innovative Technology ◽  
Hip Prostheses ◽  
Total Hip ◽  
Eos Imaging ◽  
Abnormal Posture ◽  
Total Hip Prostheses ◽  
The Subject ◽  
2D And 3D ◽  
Active Patients

More total hip arthroplasty (THA) is performed worldwide and especially in younger and more active patients compared to earlier decades. One of the focuses of THA research in the future will be on optimizing the radiological follow-up of these patients using 2D and 3D measurements of implants position while reducing the radiation dose delivered. Low-dose EOS® imaging is an innovative slot-scanning radiograph system providing valuable information in patient functional positions (standing, sitting and even squatting positions). EOS has been proven accurate and reliable without significant inconvenience caused by the metallic artifacts of implants. The ability to obtain precise data on implant orientation according to the patient posture opens new perspectives for a comprehensive analysis of the pelvic frontal and sagittal balance and its potential impact on implants function and failures. We report our 8 years experience on our first 300 THA patients using this technology routinely for pre and post op evaluation. Our results will be compared and confronted with the actual literature about this innovative technology. We shall especially emphasize our experience about patients with abnormal posture and the evolution of the subject over time, because the phenomenon of an aging spine is frequently associated with the process of aging hips.

A 5-Year Survival Analysis of 160 Biomet Magnum M2 metal-on-Metal Total Hip Prostheses

2015 ◽  
Vol 26 (1) ◽  
pp. 50-56 ◽  
Author(s):  
Maarten C. Koper ◽  
Nina M.C. Mathijssen ◽  
Stephan B.W. Vehmeijer
Keyword(s):  
Survival Analysis ◽  
Hip Prostheses ◽  
Total Hip ◽  
Metal On Metal ◽  
Total Hip Prostheses

scholarly journals Extracellular matrix metalloproteinases around loose total hip prostheses

1994 ◽  
Vol 65 (3) ◽  
pp. 281-286 ◽  
Author(s):  
Michiaki Takagi ◽  
Yrjö T Konttinen ◽  
Seppo Santavirta ◽  
Timo Sorsa ◽  
Arthur Z Eisen ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Matrix Metalloproteinases ◽  
Hip Prostheses ◽  
Total Hip ◽  
Total Hip Prostheses
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