scholarly journals Primary stability of a press‐fit cup in combination with impaction grafting in an acetabular defect model

2020 ◽  
Author(s):  
Ronja A. Schierjott ◽  
Georg Hettich ◽  
Marc Baxmann ◽  
Federico Morosato ◽  
Luca Cristofolini ◽  
...  
Keyword(s):  
Primary Stability ◽  
Acetabular Defect ◽  
Impaction Grafting ◽  
Defect Model ◽  
Press Fit

Effect of cup medialization on primary stability of press-fit acetabular cups

2020 ◽  
Vol 80 ◽  
pp. 105172
Author(s):  
Federico Morosato ◽  
Luca Cristofolini ◽  
Francesco Castagnini ◽  
Francesco Traina
Keyword(s):  
Primary Stability ◽  
Press Fit

scholarly journals Comparison of the Primary Stability of Porous Tantalum and Titanium Acetabular Revision Constructs

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1783
Author(s):  
Nicholas A. Beckmann ◽  
Rudi G. Bitsch ◽  
Mareike Schonhoff ◽  
Klaus-Arno Siebenrock ◽  
Martin Schwarze ◽  
...  
Keyword(s):  
Relative Motion ◽  
Clinical Implication ◽  
Primary Stability ◽  
Titanium Implants ◽  
Acetabular Revision ◽  
Acetabular Defect ◽  
Implant Survival ◽  
Porous Tantalum ◽  
The Difference

Adequate primary stability of the acetabular revision construct is necessary for long-term implant survival. The difference in primary stability between tantalum and titanium components is unclear. Six composite hemipelvises with an acetabular defect were implanted with a tantalum augment and cup, using cement fixation between cup and augment. Relative motion was measured at cup/bone, cup/augment and bone/augment interfaces at three load levels; the results were compared to the relative motion measured at the same interfaces of a titanium cup/augment construct of identical dimensions, also implanted into composite bone. The implants showed little relative motion at all load levels between the augment and cup. At the bone/augment and bone/cup interfaces the titanium implants showed less relative motion than tantalum at 30% load (p < 0.001), but more relative motion at 50% (p = n.s.) and 100% (p < 0001) load. The load did not have a significant effect at the augment/cup interface (p = 0.086); it did have a significant effect on relative motion of both implant materials at bone/cup and bone/augment interfaces (p < 0.001). All interfaces of both constructs displayed relative motion that should permit osseointegration. Tantalum, however, may provide a greater degree of primary stability at higher loads than titanium. The clinical implication is yet to be seen

scholarly journals Effect of bearing friction torques on the primary stability of press-fit acetabular cups: A novel in vitro method

2018 ◽  
Vol 36 (10) ◽  
pp. 2745-2753 ◽  
Author(s):  
Alexander Jahnke ◽  
Stefan Schroeder ◽  
Carlos A. Fonseca Ulloa ◽  
Gafar A. Ahmed ◽  
Bernd A. Ishaque ◽  
...  
Keyword(s):  
Primary Stability ◽  
In Vitro Method ◽  
Press Fit ◽  
Bearing Friction

Primary Stability of Press-Fit-Implanted Osteochondral Grafts

2000 ◽  
Vol 28 (1) ◽  
pp. 24-27 ◽  
Author(s):  
Jochen Duchow ◽  
Thomas Hess ◽  
Dieter Kohn
Keyword(s):  
Primary Stability ◽  
Osteochondral Grafts ◽  
Press Fit

scholarly journals Estimation of the primary stability of the press-fit and screwed-in acetabular components after hip joint arthroplasty

2017 ◽  
Vol 0 (1) ◽  
pp. 92-97
Author(s):  
Oleg Loskutov ◽  
Nadiia Naumenko ◽  
Oleksandr Loskutov ◽  
Dmytro Syniehubov ◽  
Dmytro Gorobets ◽  
...  
Keyword(s):  
Hip Joint ◽  
Primary Stability ◽  
Joint Arthroplasty ◽  
Press Fit ◽  
The Press ◽  
Acetabular Components

Characterization of Acetabular Cup Insertion Forces in Cancellous Bone Proxy for Validation of an Invasive Sensing Model and Development of Automatic Prosthesis Installation Device: A Preliminary Study

2020 ◽  
Vol 15 (2) ◽  
Author(s):  
Kambiz Behzadi ◽  
Jesse Rusk
Keyword(s):  
Force Feedback ◽  
Primary Stability ◽  
The United States ◽  
Assistive Technologies ◽  
Medical Procedure ◽  
Implant Stability ◽  
Acetabular Cup ◽  
Total Hip ◽  
Press Fit ◽  
Preliminary Study

Abstract Total hip replacement is a widespread medical procedure, with over 300,000 surgeries performed each year in the United States alone. The vast majority of total hip replacements utilize press fit fixation. Successful seating of the implant requires a delicate balance between inserting the implant deep enough to obtain sufficient primary stability, while avoiding fracture of bone. To improve patient outcomes, surgeons need assistive technologies that can guide them as to how much force to apply and when to stop impacting. The development of such technology, however, requires a greater understanding of the forces experienced in bone and the resulting cup insertion and implant stability. Here, we present a preliminary study of acetabular cup insertion into bone proxy samples. We find that as the magnitude of force on the acetabular cup increases, cup insertion and axial extraction force increase linearly, then nonlinearly, and finally plateau with full insertion. Within the small nonlinear zone, approximately 90% of both cup insertion and extraction force are achieved with only 50% total energy required for full seating, posing the question as to whether full seating is an appropriate goal in press-fit arthroplasty. For repeated impacts of a given energy, cup displacement and force experienced in bone (measured force profile—MFP) increase correspondingly and reach a plateau over a certain number of impacts (number of impacts to seating—NOITS), which represents the rate of insertion. The relationship between MFP and NOITS can be exploited to develop a force feedback mechanism to quantitatively infer optimal primary implant stability.

Influence of press-fit parameters on the primary stability of uncemented femoral resurfacing implants

2009 ◽  
Vol 31 (1) ◽  
pp. 160-164 ◽  
Author(s):  
A. Gebert ◽  
J. Peters ◽  
N.E. Bishop ◽  
F. Westphal ◽  
M.M. Morlock
Keyword(s):  
Primary Stability ◽  
Press Fit ◽  
Femoral Resurfacing

A novel approach to determine primary stability of acetabular press-fit cups

2018 ◽  
Vol 80 ◽  
pp. 1-10 ◽  
Author(s):  
Volker Weißmann ◽  
Christian Boss ◽  
Rainer Bader ◽  
Harald Hansmann
Keyword(s):  
Primary Stability ◽  
Press Fit ◽  
Novel Approach

scholarly journals Biomechanical evaluation of the primary stability of three different types of femoral stem fixations for canine total hip replacement

2020 ◽  
Author(s):  
Charles Saban ◽  
Eric Viguier ◽  
Mathieu Taroni ◽  
Arnaud Baldinger ◽  
Margaux Blondel ◽  
...  
Keyword(s):  
Femoral Stem ◽  
Primary Stability ◽  
Longitudinal Axis ◽  
Transverse Displacement ◽  
Salvage Procedure ◽  
Total Hip ◽  
Press Fit ◽  
Femoral Stems ◽  
Mean Strain

Abstract Background: Total hip arthroplasty is the main salvage procedure performed for hip osteoarthritis in dogs. Two main types of femoral stems are available: cemented stems, which offer excellent primary stability but are subject to aseptic loosening in the long term, and cementless stems, which have good long-term outcomes but lack primary stability. The adjunction of a neutral rod through the neck of the cementless stem to the lateral cortex of the femur could offer better primary stability before osteointegration. The aim of this study was to compare the primary stability of three different femoral stems, cemented (cFS), press-fit cementless (pfFS), and rod-press-fit cementless stems (r-pfFS), by measuring their transverse displacement on cyclic assays and resistance to subsidence with unidirectional load compression parallel to the longitudinal axis of the femur.Results: The force-displacement and stress-strain curves were assessed. The work necessary for subsidence, strain to failure, and mean strain of the cyclic assays were calculated. No significant differences were observed in transverse displacement (p=0.263) or mean strain (p=0.244) during the cyclic tests or in work necessary for subsidence (p=0.079) or strain to failure (p=0.075). The cFS and r-pfFS were significantly more resistant to subsidence than was the pfFS (p<0,05). No significant differences were observed between the cFS and r-pfFS groups (p=0.48).Conclusions: Cementless femoral stems with transfixing rods offer significantly higher stability to compressive load parallel to the longitudinal axis of the femur than do standard cementless stems and a level of stability comparable to that of cemented stems. r-pfFSs may be valuable in limiting the subsidence and micro-motion of press-fit femoral stems and thus improving the state of osteointegration of the prosthesis during the short-term postoperative period.

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