Strain Gauge and Photoelastic Evaluation of the Load Transfer in the Pelvis in Total Hip Replacement: The Effect of the Position of the Axis of Rotation

1989 ◽  
Vol 203 (2) ◽  
pp. 103-107 ◽  
Author(s):  
A W Miles ◽  
P B McNamee
Keyword(s):  
Total Hip Replacement ◽  
Acetabular Component ◽  
Strain Gauge ◽  
Hip Replacement ◽  
Load Transfer ◽  
Acetabular Cup ◽  
Total Hip ◽  
Axis Of Rotation ◽  
Strain Gauge Measurements

Aseptic loosening of the acetabular component is the principal long-term complication in total hip replacement. Radiographic evidence suggests a higher incidence of loosening with medialization of the axis of rotation of the acetabular cup. A simplified two-dimensional photoelastic investigation of the load transfer in the pelvis demonstrates that the stress distribution is substantially changed when this axis of rotation is medialized. Strain gauge measurements on three dry hemi-pelvic bones confirm this effect. It is postulated that the redistribution of load resulting from medialization may result in inadequate skeletal support for the acetabular component predisposing to loosening.

scholarly journals Total Hip Replacement: Exchange of a Loose Perforated Press-Fit Cup with a Porous-Coated Press-Fit Cup in a Dog

VCOT Open ◽  
2020 ◽  
Vol 03 (02) ◽  
pp. e129-e133
Author(s):  
Stephanie M.M. Colthurst ◽  
James O. Simcock ◽  
Ricky G. Cashmore
Keyword(s):  
Total Hip Replacement ◽  
Hip Replacement ◽  
Internal Diameter ◽  
Acetabular Cup ◽  
Total Hip ◽  
Press Fit ◽  
Long Term Follow Up ◽  
Excellent Functional Outcome ◽  
Head Neck

Abstract Objective The aim of this study was to report the successful revision of a loose perforated press-fit cup by exchange with a porous-coated press-fit cup while maintaining the original locking stem and head–neck unit. Methods Cup revision was performed in a dog with a loose acetabular cup that had undergone total hip replacement with a perforated press-fit cup and locking stem 29 months previously. The original locking stem was well integrated. A single session cup exchange was performed by implantation of a 28-mm porous-coated press-fit cup with 16 mm internal diameter to allow the original locking stem and head–neck unit to be preserved. Results Revision total hip arthroplasty by cup exchange resulted in excellent functional outcome with long-term follow-up 18 months postoperatively. There were no intraoperative or postoperative complications. Conclusion A loose perforated press-fit cup was successfully revised with a porous press-fit cup while allowing preservation of the initial locking stem and head–neck unit.

Durability of Zirconia-Based Ceramics and Composites for Total Hip Replacement

2007 ◽  
Vol 361-363 ◽  
pp. 791-794 ◽  
Author(s):  
Laurent Gremillard ◽  
Jérôme Chevalier
Keyword(s):  
Total Hip Replacement ◽  
Hip Replacement ◽  
High Hardness ◽  
Clinical Results ◽  
Degradation Mechanisms ◽  
Acetabular Cup ◽  
Total Hip ◽  
Specific Degradation ◽  
Metal Polymer

Ceramics have been increasingly used in orthopaedics during the last 30 years. Their biological inertness, high hardness and good mechanical strength make them excellent candidates for components such as femoral heads and acetabular cup in Total Hip Replacement prostheses. Currently used bio-inert ceramics – alumina and zirconia – give good clinical results, especially compared to metal – polymer couplings. However, they are subjected to severe biological, tribological and mechanical solicitations during more than fifteen years for the most successful prostheses. They answer these solicitations by presenting specific degradation mechanisms. We will thus examine the phenomena that can account for the long-term behaviour of zirconia components (heads and cups) in THR prostheses.

Long Term Results of Cementless Total Hip Replacement for Reversal of hip Ankylosis

2009 ◽  
Vol 19 (2) ◽  
pp. 120-127 ◽  
Author(s):  
Samuel S. Rajaratnam ◽  
Shaun A. Sexton ◽  
Tim S. Waters ◽  
William L. Walter ◽  
Bernard A. Zicat ◽  
...  
Keyword(s):  
Total Hip Replacement ◽  
Hip Replacement ◽  
Long Term Results ◽  
Harris Hip Score ◽  
Acetabular Cup ◽  
Total Hip ◽  
And Function ◽  
Lost To Follow Up ◽  
Cementless Total Hip Replacement

Fifteen patients (16 hips) with an ankylosed hip joint for a mean of 36 years (3.5 to 65), had their hips converted to a cementless Total Hip Replacement (THR). They were followed-up for a median of 10.75 years (5.0 to 19) with none lost to follow-up. All patients showed improved mobility and function post-operatively. The Harris Hip Score improved from 70 (SEM 3.4) to 83 post-operatively (SEM 4.4), which was statistically significant (p < 0.05). There was one acetabular cup revision at 5 years post implantation for aseptic loosening. All other femoral and acetabular components remained clinically and radiographically well fixed. We conclude that a previously ankylosed hip can be effectively converted to a cementless total hip replacement with good long term results.

Long-term results of harris total hip replacement

1986 ◽  
Vol 1 (4) ◽  
pp. 229-236 ◽  
Author(s):  
Paul F. Lachiewicz ◽  
Byron D. Rosenstein
Keyword(s):  
Total Hip Replacement ◽  
Hip Replacement ◽  
Long Term Results ◽  
Total Hip
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