Acoustic Vibration and Mechanical In Vivo Analysis of the Hip Joint After a Total Hip Arthroplasty

2007 ◽  
Author(s):  
D. A. Glaser ◽  
R. D. Komistek ◽  
H. E. Cates ◽  
M. Mahfouz
Keyword(s):  
Femoral Head ◽  
Total Hip Replacement ◽  
Hip Joint ◽  
Hip Replacement ◽  
Acoustic Vibration ◽  
Valuable Insight ◽  
Acetabular Cup ◽  
Total Hip ◽  
Resonance Frequencies

The major complications following total hip replacement (THA) are implant loosening, dislocation, instability, fracture and infection. It is hypothesized that vibration, in the range of the resonance frequencies, may cause pain, bone degeneration and fracture. A further understanding of the physical response resulting from impact during femoral head sliding may lead to valuable insight pertaining to THA failure. Therefore, the first objective of this present study was to determine if frequencies propagating through the hip joint near resonant frequencies may lead to wear or loosening of the components. Recently, studies found that femoral head sliding, often referred to as hip separation, between the acetabulum cup and the femoral head does occur, which may also play a role in complications observed with THA today, but a the effects of hip separation and the causes of its occurrence has not been studied as jet. Therefore, the second objective of this study was to determine if a sound sensor, externally attached, could be used to correlate impact loading sounds from femoral head sliding in the acetabular cup. Additional objective of this study was to develop a mathematical model that better simulates the in vivo loading conditions of total hip replacement patients using in vivo fluoroscopic and ground reaction data as input.

Possible Tactics Variants of Total Hip Replacement in Dysplastic Coxarthrosis

2004 ◽  
Vol 11 (4) ◽  
pp. 29-34
Author(s):  
I F Akhtyamov ◽  
S V Turenkov ◽  
A D Taranenko ◽  
I F Akhtyamov ◽  
S V Turenkov ◽  
...  
Keyword(s):  
Femoral Head ◽  
Total Hip Replacement ◽  
Hip Joint ◽  
Joint Replacement ◽  
Hip Replacement ◽  
Pelvic Osteotomy ◽  
Femoral Head Coverage ◽  
Pathologic Process ◽  
Total Hip ◽  
Terminal Stage

Conception for the choice of total hip replacement variant in adult patients with dysplastic coxarthrosis is presented. Criteria for the choice are interrelation of hip joint elements that is evaluated according to the femoral head coverage index elaborated by the authors. The conception was used in 126 patients (136 joints). Advantages of two-steps treatment of dysplastic coxarthrosis were detected: correction of joint elements correlation (pelvic osteotomy by Hiarу) at early stages of pathologic process and subsequent joint replacement at the terminal stage.

3-D Model of a Total Hip Replacement In Vivo Providing Hydrodynamic Pressure and Film Thickness for Walking and Bicycling

2003 ◽  
Vol 125 (6) ◽  
pp. 777-784 ◽  
Author(s):  
Donna M. Meyer, ◽  
John A. Tichy,
Keyword(s):  
Total Hip Replacement ◽  
Hip Replacement ◽  
Hydrodynamic Lubrication ◽  
Hydrodynamic Pressure ◽  
Fluid Film ◽  
Joint Fluid ◽  
Acetabular Cup ◽  
Total Hip ◽  
Pressure Distributions

Formulation of a 3-D lubrication simulation of a total hip replacement in vivo is presented using a finite difference approach. The goal is to determine if hydrodynamic lubrication is taking place, how thick the joint fluid film is and over what percentage of two gait cycles, (walking and bicycling), the hydrodynamic lubricating action is occurring, if at all. The assumption of rigid surfaces is made, which is conservative in the sense that pure hydrodynamic lubrication is well known to predict thinner films than elastohydrodynamic lubrication (EHL) for the same loading. The simulation method includes addressing the angular velocity direction changes and accurate geometry configuration for the acetabular cup and femoral head components and provides a range of results for material combinations of CoCrMo-on-UHMWPE, CoCrMo-on-CoCrMo, and alumina-on-alumina components. Results are in the form of the joint fluid film pressure distributions, load components and film thicknesses of the joint fluid, for the gait cycles of walking and bicycling. Results show hydrodynamic action occurs in only about 10% of a walking gait cycle and throughout nearly 90% of a bicycling gait. During the 10% of the walking cycle that develops hydrodynamic lubrication, the minimum fluid film thicknesses are determined to be between 0.05 μm and 1.1 μm, while the range of film thicknesses for bicycling is between 0.1 μm and 1.4 μm, and occurs over 90% of the bicycling gait. Pressure distributions for these same periods are in the range of 2 MPa to 870 MPa for walking and 1 MPa to 24 MPa for bicycling.

Total Hip Replacement after Failed Femoral Head and Neck Excision in Two Dogs and Two Cats

2012 ◽  
Vol 41 (1) ◽  
pp. 136-142 ◽  
Author(s):  
Noel Fitzpatrick ◽  
Laura Pratola ◽  
Russell Yeadon ◽  
Christos Nikolaou ◽  
Michael Hamilton ◽  
...  
Keyword(s):  
Femoral Head ◽  
Head And Neck ◽  
Total Hip Replacement ◽  
Hip Replacement ◽  
Total Hip

Psoriasis Vulgaris Caused by Ceramic Inserts Used in Total Hip Replacement

2012 ◽  
Vol 16 (6) ◽  
pp. 448-450 ◽  
Author(s):  
Fujio Higuchi ◽  
Daisuke Tsuruta ◽  
Yumiko Ishibashi ◽  
Kazuko Imamura ◽  
Tokiko Shimoyama ◽  
...  
Keyword(s):  
Nous Avons ◽  
Total Hip Replacement ◽  
Hip Joint ◽  
Hip Replacement ◽  
Nuclear Factor Κb ◽  
Total Hip ◽  
First Case ◽  
The Right ◽  
Ceramic Insert ◽  
Psoriatic Lesions

Background: Ceramics are inorganic nonmetallic materials and are used as bioinert components in joint replacement surgeries. Ceramics are known to be low allergenic. We experienced a ceramic-induced psoriasis. Objective: We report a first case of possible ceramic-induced psoriasis caused by a ceramic insert. Methods: A 55-year-old female received an implanted ceramic-on-ceramic total hip replacement for osteoarthritis of the right hip joint. Following surgery, she developed psoriatic lesions, which continued for 10 years. We suspected that psoriasis was caused by a ceramic insert and removed it surgically. Results: When the ceramic insert was replaced with a polyethylene-on-metal hip joint, the psoriatic lesions completely disappeared. Conclusion: The pathogenesis of psoriasis is still an enigma, although deregulation of nuclear factor κB signaling and resulting abnormal cytokine secretion are speculated to be involved. Ceramics may affect these signaling events and cause the onset of psoriasis. Renseignements de base: Les céramiques sont des matériaux non métalliques inorganiques et sont utilisées comme composants bio-inertes dans les arthroplasties. Les céramiques sont reconnues pour être peu allergisantes. Nous avons observé un psoriasis provoqué par la céramique. Objectif: Nous exposons un premier cas possible de psoriasis provoqué par la céramique causé par un implant en céramique. Méthodes: Une femme de 55 ans a reçu une prothèse céramique-sur-céramique implantée lors d'une arthroplastie totale de la hanche pour traiter l'arthrose de l'articulation de la hanche droite. Après la chirurgie, elle a développé des lésions psoriasiques dont la manifestation s'est poursuivie pendant 10 ans. Nous avons soupçonné que le psoriasis était causé par l'implant en céramique, et nous l'avons enlevé chirurgicalement. Résultats: Une fois l'implant en céramique remplacé par une prothèse articulaire en polyéthylène-sur-métal, les lésions psoriasiques ont disparu complètement. Conclusion: La pathogenèse du psoriasis demeure une énigme, bien qu'on suppose que la dérégulation de la voie de signalisation NF-κB et que la sécrétion anormale de cytokines résultante soient impliquées. Les céramiques peuvent affecter ces événements de signalisation et provoquer l'apparition du psoriasis.

scholarly journals Total Hip Replacement: Results of a Postal Survey of Current Practice on the Cement Fixation of the Acetabular Cup in the UK

2004 ◽  
Vol 14 (3) ◽  
pp. 155-162
Author(s):  
R. Mootanah ◽  
P. Ingle ◽  
K. Cheah ◽  
J. K. Dowell ◽  
J. C. Shelton
Keyword(s):  
Total Hip Replacement ◽  
Hip Replacement ◽  
Current Practice ◽  
Postal Survey ◽  
Acetabular Cup ◽  
Total Hip ◽  
The Uk

scholarly journals Malunion of the Acetabulum Treated by Intra-articular Buttress

2020 ◽  
Vol 2020 ◽  
pp. 1-3
Author(s):  
D. Saragaglia ◽  
J. Gaillot
Keyword(s):  
Femoral Head ◽  
Total Hip Replacement ◽  
Clinical Result ◽  
Hip Replacement ◽  
Surgical Indications ◽  
Total Hip ◽  
Original Technique ◽  
Head Fragment

Acetabulum malunions are extremely difficult to treat, and for many years, surgical indications have been dominated by total hip replacement. We treated a protruding acetabular malunion, 20 years ago, using an intra-articular buttress, by means of an allograft corresponding to a femoral head fragment which had been cryopreserved. The radiological and clinical result with this extended follow-up is quite remarkable, which has motivated us to present this original technique.

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