scholarly journals Early and medium-term results of total joint arthroplasty of first carpo-metacarpal joint

2020 ◽  
Vol 27 (4) ◽  
pp. 19-27
Author(s):  
Ekaterina N. Simonova ◽  
Timofei I. Aleksandrov ◽  
Valeriy M. Prokhorenko
Keyword(s):  
Study Groups ◽  
Joint Arthroplasty ◽  
Contributing Factors ◽  
Press Fit ◽  
Early Results ◽  
The Press ◽  
Orthopedic Care ◽  
Ceramic Implants ◽  
Instrumental Methods ◽  
Joint Evaluation

Introduction. Reviews dedicated to surgical treatment of the first carpo-metacarpal joint repeatedly state that the evaluation of arthroplasty results is difficult. This is due to the small clinical study groups and the lack of description of all types of outcomes. The aim of the study is to analyze obtained early and midterm results of ceramic CMC-arthroplasty. The endoprosthesis are represented with unbound proximal and distal components made of ceramic material. The interaction of the head and cup is represented with no intersecting forces that impede on the multi-axial movement. The surgical technique of CMC-1 joint arthroplasty prescribes the installation of components by the press-fit fixation. There is a brief emphasis on the features of the joint and contributing factors for the development of risarthrosis. Early results are described. Cases of unsatisfactory outcomes are described separately. Materials and methods. The study group included patients from 33 to 72 years. The total number of observers was 28 people. We performed revision endoprosthetics in 2 cases (7%), which were associated with aseptic instability of the proximal component according to the osteoporosis. It obvious that endoprosthetics is the only method of orthopedic care that allows maintain mobility and achieve stability of the destroyed CMC joint. Evaluation of the results was carried out by clinical and instrumental methods. Results. It cannot be denied that the CMC arthroplasty is the only method of orthopedic care that allows to preserve mobility and achieve stability of the broken joint. Conclusion. Arthroplasty of the carpo-metacarpal joint with ceramic implants is a promising method of orthopedic care, that allows to restore the function of the hand.

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

scholarly journals Cementless vs Cemented Total Ankle Arthroplasty: A Prospective Comparison of the Laterally Placed Trabecular Metal Ankle

2019 ◽  
Vol 4 (4) ◽  
pp. 2473011419S0045
Author(s):  
Alastair S.E. Younger ◽  
Federico G. Usuelli ◽  
Donald Bohay ◽  
Fabian Krause ◽  
Eric Giza ◽  
...  
Keyword(s):  
Statistical Significance ◽  
Pain Scale ◽  
Rank Test ◽  
Trabecular Metal ◽  
Chi Square ◽  
Press Fit ◽  
Early Results ◽  
Prospective Comparison ◽  
The Press ◽  
Difficulty Scale

Category: Ankle, Ankle Arthritis Introduction/Purpose: The laterally placed trabecular metal ankle replacement is placed using a jig and a fibular osteotomy. The tibia and talus are reamed to match the curved contour of the replacement. Additional fixation is achieved using two rails on the tibial and talar component. Additional cement fixation can be used by a bead of cement on the rail to assist in early component fixation. Cement fixation did not cover the entire ingrowth surface but was only used on the rails as per the technique manual. The purpose of this study is to compare the early results of 113 total ankle replacements with and without rail cement. Methods: 121 patients were enrolled in a prospective study. 10 centers were involved. 3 patients underwent revision and 5 withdrew (1 death, 2 lost to follow up and 2 requested discontinuation). Patients were assigned cement or no cement based on the surgeons practice. EQ5D, AOFAS, AOS scores were obtained preoperatively and at 6 weeks, 6 months, and yearly thereafter. Revision of metal components for infection or loosening were secondary end points. Statistical significance was tested by the Wilcoxon Signed Rank Test 26 and set at p= 0.05. 95% confidence intervals are given. 59 ankles had cement, and 53 had press fit. The demographics showed the cement augmentation patients were heavier and older. The cement cases had longer surgical times (169 minutes, CI 159 to 179 vs 154, CI 144 to 163). Of 113 cases, 113 were followed at 1 year, and 100 at 2 years and 67 at 3 years. Results: The press fit components without cement showed statistically better outcomes at 6 weeks for the AOFAS score. The EQ5D favored the press fit component at 6 weeks, 6 months and 1 year. For the AOS pain scale the 6 month results favored the press fit component, and for the difficulty scale the results favored the press fit components at 6 weeks and 1 year. Survivorship for all joint replacements (revision of metal components) was 96 percent for the total cohort, with 2 metal components in two ankles being revised, both in the cementless group (chi square not significant). Conclusion: As all outcomes to date favor press fit fixation there does not seem to be any need to augment fixation with cement in this total ankle design. There were two metal component revisions in the cementless group and one associated with loosening. There major are demographic differences between the groups and so an RCT would be required to correctly answer the question.

Auszugverhalten von Schaftfräsern*/Pull-out behavior of end mills – Experimental study on different clamping devices with various clamping mechanisms

2018 ◽  
Vol 108 (05) ◽  
pp. 353-358
Author(s):  
E. Abele ◽  
F. Ali ◽  
M. Berger
Keyword(s):  
Experimental Study ◽  
Test Bench ◽  
Mechanical Load ◽  
Mechanisms Of Action ◽  
Heavy Duty ◽  
Press Fit ◽  
Pull Out ◽  
The Press ◽  
End Mills ◽  
Tool Position

Aus Schwerzerspanung und Turbinenschaufelfertigung ist bekannt, dass Werkzeuge aus dem Spannfutter ausgezogen werden. Die veränderte Werkzeugposition führt zur Abweichung von den vorgegebenen Toleranzen und einer geringeren Fertigungsqualität oder Beschädigung des Werkstücks. Der Artikel untersucht das Auszugsverhalten verschiedener Spannfutter. Mit einem Prüfstand können die Einflüsse der mechanischen Belastung und der Klemmlänge auf die Haltekraft im Pressverband betrachtet und die Wirkmechanismen beim Auszug des Werkzeuges aus dem Spannfutter sensorisch ermittelt werden.   From heavy-duty cutting and turbine blade manufacturing it is known that tools pull out from chucks. A change in tool position leads to deviations from tolerance and decreases manufacturing quality or damages the workpiece. This article explores the extension behavior of different chucks on a specifically designed test bench. This allows determining how mechanical load and clamping length influence the holding force in the press fit and what mechanisms of action affect the extraction of the tool from the chuck.

14-Year Median Follow-Up Using the Press-Fit Condylar Sigma Design for Total Knee Arthroplasty

2013 ◽  
Vol 28 (8) ◽  
pp. 1286-1290 ◽  
Author(s):  
Shantanu S. Patil ◽  
George Branovacki ◽  
Mersadies R. Martin ◽  
Pamela A. Pulido ◽  
Yadin D. Levy ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Press Fit ◽  
The Press ◽  
Total Knee

Rationale of the Press-Fit Cup

1995 ◽  
pp. 190-199
Author(s):  
E. Morscher
Keyword(s):  
Press Fit ◽  
The Press

Loosening and Osteolysis with the Press-Fit Condylar Posterior-Cruciate-Substituting Total Knee Replacement

2001 ◽  
Vol 83 (3) ◽  
pp. 398-403 ◽  
Author(s):  
Stephen A. Mikulak ◽  
Ormonde M. Mahoney ◽  
Mylene A. dela Rosa ◽  
Thomas P. Schmalzried
Keyword(s):  
Total Knee Replacement ◽  
Knee Replacement ◽  
Press Fit ◽  
The Press ◽  
Total Knee

Interface Biomechanical Properties between Femora and Bioactive Ceramic Coatings Prostheses during the Initial Implant Stage

2007 ◽  
Vol 336-338 ◽  
pp. 1806-1809
Author(s):  
Liu Ding Tang ◽  
W.M. Zhao ◽  
L.Y. Tian ◽  
Bing Zhe Li
Keyword(s):  
Circumferential Stress ◽  
Biomechanical Properties ◽  
Ceramic Coatings ◽  
Homogeneous Layer ◽  
Ti Alloy ◽  
Biomechanical Models ◽  
Press Fit ◽  
The Press ◽  
Shearing Strength ◽  
Bioactive Ceramic

Biomechanical models of implanting prostheses into femora by means of press fit, i.e. the mechanics of non-homogeneous layer-like composites, have been used to quantify the press-fit strength and circumferential stress of the interface, when femora are partially replaced by different thicknesses of bioactive ceramic coatings on a prosthesis surface during the initial implant stage. The maximum press-fit strength appears on the interface between femora and Ti alloy prostheses with non-coating; the press-fit strength decreases with the increased thickness of the coating. The circumferential stress displayed as the large tensile stress at the femoral side of the interface; the compressive stress, appeared at the side of the coating and Ti alloy prosthesis. The shearing strength, jointing between the prostheses and femora would be bigger with the thinner bioactive ceramic coatings. Considering the biodegradability of bioactive ceramic coatings, e.g. hydroxyapatite, HA, it is concluded that the optimum thickness of the bioactive ceramic coatings will be about 50-60 microns.

Ten-Year Results of the Press Fit Condylar Sigma Cobalt–Chrome Total Knee Replacement

2018 ◽  
Vol 32 (03) ◽  
pp. 222-226
Author(s):  
Ivan Brenkel ◽  
Phil Walmsley ◽  
Oisin Keenan
Keyword(s):  
Outcome Measures ◽  
Oxford Knee Score ◽  
High Survival ◽  
Real World Data ◽  
Press Fit ◽  
Patient Reported ◽  
The Press ◽  
Aseptic Revision ◽  
Total Knee ◽  
Cobalt Chrome

AbstractTotal knee arthroplasty (TKA) is reliant on safe and effective implants. The Press Fit Condylar Sigma Cobalt–Chrome (PFCSCC) was introduced in 2006, but no reports have examined long-term failure rates and patient-reported outcome measures (PROMs). The primary aim of this study was to assess survival outcomes of the PFCSCC at 10 years after implantation. Prospective data collection was performed on all patients undergoing primary TKA in one orthopaedic department using this prosthesis exclusively from February 1, 2006, to January 31, 2007. Follow-up was at 10 years. Survival analysis was performed using two primary outcome measures: (1) all-cause joint revision and (2) aseptic revision. Secondary outcomes measures included the American Knee Society Score (AKSS) and Oxford Knee Score (OKS). In total, 249 knees of 233 patients underwent primary TKA. Mean patient age was 66.7 years (range 34–80), and mean body mass index (BMI) was 30 kg/m2 (20.7–40.1). Reviewing all causes of revisions, 14 joints (5.6%) of 14 patients required reoperation. Of these, nine were for deep infection, including six in the first year. Four (1.6%) underwent aseptic revision. Mean AKSS changed from 47.6 to 90.4 (n = 140; p < 0.001) at 10 years, and mean OKS changed from 38.3 to 23.2 (n = 149; p < 0.001). Prospective analysis of consecutive TKA cases using this design of prosthesis demonstrated high survival rates of 94.4% (all-cause revision) and 98.4% (aseptic revision) at 10 years. Postoperative gains in PROMs were sustained at 10 years. These real-world data represent a substantial extension to previous reports for the PFCSCC and suggest that it is not prone to late mechanical failure.

The influence of acetabular bone cracks in the press-fit hip replacement: Numerical and experimental analysis

2013 ◽  
Vol 28 (6) ◽  
pp. 635-641 ◽  
Author(s):  
A. Ramos ◽  
R.J. Duarte ◽  
C. Relvas ◽  
A. Completo ◽  
J.A. Simões
Keyword(s):  
Experimental Analysis ◽  
Hip Replacement ◽  
Acetabular Bone ◽  
Press Fit ◽  
The Press
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