scholarly journals Stability of small pegs for cementless implant fixation

2017 ◽  
Vol 35 (12) ◽  
pp. 2765-2772 ◽  
Author(s):  
Diogo M. Geraldes ◽  
Ulrich Hansen ◽  
Jonathan Jeffers ◽  
Andrew A. Amis
Keyword(s):  
Implant Fixation ◽  
Cementless Implant

Progressive Loss of Implant Fixation in a Preclinical Rat Model of Cemented Knee Arthroplasty

2020 ◽  
Author(s):  
Kenneth A Mann ◽  
Mark A Miller ◽  
Jeffrey K Rossow ◽  
Megan E Tatusko ◽  
Jason A Horton ◽  
...  
Keyword(s):  
Knee Arthroplasty ◽  
Rat Model ◽  
Implant Fixation ◽  
Progressive Loss

Use of small cannulated screws for fixation in foot surgery

2000 ◽  
Vol 90 (5) ◽  
pp. 240-246 ◽  
Author(s):  
AE Burns
Keyword(s):  
Effective Means ◽  
Bone Screws ◽  
Cannulated Screws ◽  
Implant Fixation ◽  
Foot Surgery ◽  
Fixation Failure ◽  
Untoward Event ◽  
Patient Noncompliance

Use of cannulated bone screws, as compared with use of traditional bone screws, has been reported to decrease surgical time, allow for more precise screw placement, and reduce sources of error. Cannulation of the smaller-size screws that are routinely used in foot surgery has not been available until the last few years. This article reports on the use of the small cannulated screws manufactured by Alphatec Manufacturing, Inc (Palm Desert, California). The screw sizes available in the Mini Lag Screw System are 2.7, 3.5, and 4.0 mm. A long-term clinical and radiographic prospective evaluation of 70 procedures performed on 49 patients was conducted. The follow-up time for all patients was 2 years. None of the 70 implants fractured, and seven procedures (in seven patients) resulted in some type of implant-fixation failure. All of the fixation failures, however, appeared to be related to an untoward event or patient noncompliance. These smaller cannulated screws proved to be a reliable and effective means of fixation in foot surgery.

scholarly journals Cemented versus uncemented fixation in total hip replacement: a systematic review and meta-analysis of randomized controlled trials

2013 ◽  
Vol 5 (1) ◽  
pp. 8 ◽  
Author(s):  
Ali Abdulkarim ◽  
Prasad Ellanti ◽  
Nicola Motterlini ◽  
Tom Fahey ◽  
John M. O’Byrne
Keyword(s):  
Systematic Review ◽  
Randomized Controlled Trials ◽  
Controlled Trials ◽  
Implant Fixation ◽  
Short Term ◽  
Optimal Method ◽  
Radiographic Findings ◽  
Total Hip ◽  
Randomized Controlled ◽  
Significant Difference

The optimal method of fixation for primary total hip replacements (THR), particularly fixation with or without the use of cement is still controversial. In a systematic review and metaanalysis of all randomized controlled trials comparing cemented versus uncemented THRS available in the published literature, we found that there is no significant difference between cemented and uncemented THRs in terms of implant survival as measured by the revision rate. Better short-term clinical outcome, particularly an improved pain score can be obtained with cemented fixation. However, the results are unclear for the long-term clinical and functional outcome between the two groups. No difference was evident in the mortality and the post operative complication rate. On the other hand, the radiographic findings were variable and do not seem to correlate with clinical findings as differences in the surgical technique and prosthesis design might be associated with the incidence of osteolysis. We concluded in our review that cemented THR is similar if not superior to uncemented THR, and provides better short term clinical outcomes. Further research, improved methodology and longer follow up are necessary to better define specific subgroups of patients in whom the relative benefits of cemented and uncemented implant fixation can be clearly demonstrated.

scholarly journals No association between serum metal ions and implant fixation in large-head metal-on-metal total hip arthroplasty

2014 ◽  
Vol 85 (4) ◽  
pp. 355-362 ◽  
Author(s):  
Mette Holm Hjorth ◽  
Kjeld Søballe ◽  
Stig Storgaard Jakobsen ◽  
Nina Dyrberg Lorenzen ◽  
Inger Mechlenburg ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Metal Ions ◽  
Hip Arthroplasty ◽  
Implant Fixation ◽  
Total Hip ◽  
Large Head ◽  
Metal On Metal

Finite Element Assessment of a Porous Tibial Implant Design Using Rhombic Dodecahedron Structure

2021 ◽  
Vol 318 ◽  
pp. 71-81
Author(s):  
Basma Eltlhawy ◽  
Tawfik El-Midany ◽  
Noha Fouda ◽  
Ibrahim Eldesouky
Keyword(s):  
Finite Element ◽  
Clinical Performance ◽  
Bone Ingrowth ◽  
Maximum Shear Stress ◽  
Compressive Loading ◽  
Stress Shielding ◽  
Titanium Implant ◽  
Implant Design ◽  
Implant Fixation ◽  
Rhombic Dodecahedron

The current research presents a novel porous tibia implant design based on porous structure. The implant proximal portion was designed as a porous rhombic dodecahedron structure with 500 μm pore size. Finite element method (FEM) was used to assess the stem behavior under compressive loading compared to a solid stem model. CATIA V5R18 was used for modeling both rhombic dodecahedron and full solid models. Static structural analysis was carried out using ANSYS R18.1 to asses the implant designs. The results indicated enhanced clinical performance of tibial-knee implants compared to the solid titanium implant via increasing the maximum von-Mises stresses by 64% under the tibial tray in porous implant which reduce stress shielding. Also, the maximum shear stress developed in bone/implant interface was reduced by 68% combined with relieving the stress concentration under the stem tip to relieve patients' pain. Finally, porous implants provide cavities for bone ingrowth which improve implant fixation.

scholarly journals Finite-element analysis of the influence of tibial implant fixation design of total ankle replacement on bone–implant interfacial biomechanical performance

2020 ◽  
Vol 28 (3) ◽  
pp. 230949902096612
Author(s):  
Jian Yu ◽  
Chao Zhang ◽  
Wen-Ming Chen ◽  
Dahang Zhao ◽  
Pengfei chu ◽  
...  
Keyword(s):  
Finite Element ◽  
Total Ankle Replacement ◽  
Implant Design ◽  
Fixation Method ◽  
Implant Loosening ◽  
Implant Fixation ◽  
Bone Resection ◽  
Bone Implant ◽  
Initial Stability ◽  
Ankle Replacement

Purpose: Implant loosening in tibia after primary total ankle replacement (TAR) is one of the common postoperative problems in TAR. Innovations in implant structure design may ideally reduce micromotion at the bone–implant interface and enhance the bone-implant fixation and initial stability, thus eventually prevents long-term implant loosening. This study aimed to investigate (1) biomechanical characteristics at the bone–implant interface and (2) the influence of design features, such as radius, height, and length. Methods: A total of 101 finite-element models were created based on four commercially available implants. The models predicted micromotion at the bone–implant interface, and we investigated the impact of structural parameters, such as radius, length, and height. Results: Our results suggested that stem-type implants generally required the highest volume of bone resection before implantation, while peg-type implants required the lowest. Compared with central fixation features (stem and keel), peripherally distributed geometries (bar and peg) were associated with lower initial micromotions. The initial stability of all types of implant design can be optimized by decreasing fixation size, such as reducing the radius of the bars and pegs and lowering the height. Conclusion: Peg-type tibial implant design may be a promising fixation method, which is required with a minimum bone resection volume and yielded minimum micromotion under an extreme axial loading scenario. Present models can serve as a useful platform to build upon to help physicians or engineers when making incremental improvements related to implant design.

Lamination for subdermal implant fixation

2009 ◽  
Vol 91B (1) ◽  
pp. 17-25 ◽  
Author(s):  
Bryan D. Hori ◽  
Royann J. Petrell ◽  
Andrew W. Trites ◽  
Tamara Godbey
Keyword(s):  
Implant Fixation ◽  
Subdermal Implant
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