Reconstruction of the Acetabular Bone Defect with Morselized Bone Grafts in Acetabular Cup Revision Screw fixed Hemispherical Cup vs. Bipolar Cup

1996 ◽  
Vol 31 (3) ◽  
pp. 519
Author(s):  
Yougn Min Kim ◽  
Hee Joong Kim ◽  
Gyu Hwan Kim ◽  
Sang Min Lee ◽  
Chung Hoon Lee
Keyword(s):  
Bone Defect ◽  
Bone Grafts ◽  
Acetabular Cup ◽  
Acetabular Bone ◽  
Acetabular Bone Defect ◽  
Cup Revision

scholarly journals Acetabular Bone Defect in Total Hip Arthroplasty for Crowe II or III Developmental Dysplasia of the Hip: A Finite Element Study

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Yinqiao Du ◽  
Jun Fu ◽  
Jingyang Sun ◽  
Guoqiang Zhang ◽  
Jiying Chen ◽  
...  
Keyword(s):  
Bone Defect ◽  
Developmental Dysplasia ◽  
Von Mises Stress ◽  
Acetabular Cup ◽  
Acetabular Bone ◽  
Fea Model ◽  
Acetabular Bone Defect ◽  
The Stability ◽  
Von Mises ◽  
Different Diameters

Background. The purpose of this study was to establish the finite element analysis (FEA) model of acetabular bone defect in Crowe type II or III developmental dysplasia of the hip (DDH), which could evaluate the stability of the acetabular cup with different types of bone defects, different diameters of femoral ceramic heads, and the use of screws and analyze the stress distribution of screws. Methods. The FEA model was based on the CT scan of a female patient without any acetabular bone defect. The model of acetabular bone defect in total hip arthroplasty for Crowe II or III DDH was made by the increasing superolateral bone defect area of the acetabular cup. Point A was located in the most medial part of the acetabular bone defect. A 52 mm PINNACLE cup with POROCOAT Porous coating was implanted, and two screws (the lengths were 25 mm and 40 mm) were implanted to fix the acetabular cup. The stability of the acetabular cup and the von Mises stress of point A and screws were analyzed by a single-legged stance loading applied in 1948 N (normal working). The different diameters of the femoral ceramic head (28 mm, 32 mm, and 36 mm) were also analyzed. Results. The von Mises stress of point A was gradually increased with the increasing uncoverage values. When the uncoverage values exceeded 24.5%, the von Mises stress of point A without screws increased significantly, leading to instability of the cup. Screws could effectively reduce the von Mises stress of point A with uncoverage values of more than 24.5%. However, the peak von Mises stress in the screws with the uncoverage values that exceeded 24.5% was considerably increased. The diameter of the femoral ceramic head had no significant effect on the von Mises stress and the stability of the acetabular cup. Conclusions. We recommend that uncoverage values of less than 24.5% with or without screw is safe for patients with Crowe II or III DDH.

scholarly journals Reconstruction of Severe Acetabular Bone Defect with 3D Printed Ti6Al4V Augment: A Finite Element Study

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Jun Fu ◽  
Ming Ni ◽  
Jiying Chen ◽  
Xiang Li ◽  
Wei Chai ◽  
...  
Keyword(s):  
Finite Element ◽  
Yield Strength ◽  
Bone Defect ◽  
Cancellous Bone ◽  
Acetabular Bone ◽  
Fea Model ◽  
Acetabular Bone Defect ◽  
3D Printed ◽  
Von Mises ◽  
Von Mises Stresses

Purpose. The purpose of this study was to establish the finite element analysis (FEA) model of acetabular bone defect reconstructed by 3D printed Ti6Al4V augment and TM augment and further to analyze the stress distribution and clinical safety of augments, screws, and bones.Methods. The FEA model of acetabular bone defect reconstructed by 3D printed Ti6Al4V augment was established by the CT data of a patient with Paprosky IIIA defect. The von Mises stresses of augments, screws, and bones were analyzed by a single-legged stance loading applied in 3 increments (500 N, 2000 N, and 3000 N).Results. The peak von Mises stresses under the maximal loading in the 3D printed augments, screws, and cortical bone were less than the yield strength of the corresponding component. However, the peak stress in the bone was greater than the yield strength of cancellous bone under walking or jogging loading. And under the same loading, the peak compressive and shear stresses in bone contact with TM augment were larger than these with 3D printed augment.Conclusions. The FEA results show that all the components will be intact under single-legged standing. However, partial cancellous bone contacted with 3D printed augment and screws will lose efficacy under walking or jogging load. So we recommend that patients can stand under full bearing, but can not walk or jog immediately after surgery.

scholarly journals In Vivo Reconstruction of the Acetabular Bone Defect by the Individualized Three-Dimensional Printed Porous Augment in a Swine Model

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Jun Fu ◽  
Yi Xiang ◽  
Ming Ni ◽  
Xiaojuan Qu ◽  
Yonggang Zhou ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Bone Defect ◽  
Bone Ingrowth ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Acetabular Bone ◽  
Acetabular Bone Defect ◽  
3D Printed ◽  
Matching Degree

Background and Purpose. This study established an animal model of the acetabular bone defect in swine and evaluated the bone ingrowth, biomechanics, and matching degree of the individualized three-dimensional (3D) printed porous augment. Methods. As an acetabular bone defect model created in Bama miniswine, an augment individually fabricated by 3D print technique with Ti6Al4V powders was implanted to repair the defect. Nine swine were divided into three groups, including the immediate biomechanics group, 12-week biomechanics group, and 12-week histological group. The inner structural parameters of the 3D printed porous augment were measured by scanning electron microscopy (SEM), including porosity, pore size, and trabecular diameter. The matching degree between the postoperative augment and the designed augment was assessed by CT scanning and 3D reconstruction. In addition, biomechanical properties, such as stiffness, compressive strength, and the elastic modulus of the 3D printed porous augment, were measured by means of a mechanical testing machine. Moreover, bone ingrowth and implant osseointegration were histomorphometrically assessed. Results. In terms of the inner structural parameters of the 3D printed porous augment, the porosity was 55.48 ± 0.61 % , pore size 319.23 ± 25.05   μ m , and trabecular diameter 240.10 ± 23.50   μ m . Biomechanically, the stiffness was 21464.60 ± 1091.69   N / mm , compressive strength 231.10 ± 11.77   MPa , and elastic modulus 5.35 ± 0.23   GPa , respectively. Furthermore, the matching extent between the postoperative augment and the designed one was up to 91.40 ± 2.83 % . Besides, the maximal shear strength of the 3D printed augment was 929.46 ± 295.99   N immediately after implantation, whereas the strength was 1521.93 ± 98.38   N 12 weeks after surgery ( p = 0.0302 ). The bone mineral apposition rate (μm per day) 12 weeks post operation was 3.77 ± 0.93   μ m / d . The percentage bone volume of new bone was 22.30 ± 4.51 % 12 weeks after surgery. Conclusion. The 3D printed porous Ti6Al4V augment designed in this study was well biocompatible with bone tissue, possessed proper biomechanical features, and was anatomically well matched with the defect bone. Therefore, the 3D printed porous Ti6Al4V augment possesses great potential as an alternative for individualized treatment of severe acetabular bone defects.

Initial stability of a highly porous titanium cup in an acetabular bone defect model

2018 ◽  
Vol 23 (4) ◽  
pp. 665-670 ◽  
Author(s):  
Kensei Yoshimoto ◽  
Yasuharu Nakashima ◽  
Miyo Wakiyama ◽  
Daisuke Hara ◽  
Akihiro Nakamura ◽  
...  
Keyword(s):  
Bone Defect ◽  
Porous Titanium ◽  
Defect Model ◽  
Acetabular Bone ◽  
Acetabular Bone Defect ◽  
Initial Stability ◽  
Highly Porous

Glass-Ceramic implant in acetabular bone defect: An experimental study

1992 ◽  
Vol 3 (4) ◽  
pp. 245-249 ◽  
Author(s):  
Satoru Yoshii ◽  
Takao Yamamuro ◽  
Takashi Nakamura ◽  
Masanori Oka ◽  
Haruki Takagi ◽  
...  
Keyword(s):  
Experimental Study ◽  
Bone Defect ◽  
Glass Ceramic ◽  
Acetabular Bone ◽  
Acetabular Bone Defect ◽  
Ceramic Implant

scholarly journals Stress analysis of a Burch-Schneider cage in an acetabular bone defect: A case study

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Katrien Plessers ◽  
Hans Mau
Keyword(s):  
Bone Defect ◽  
Long Term Results ◽  
Element Analysis ◽  
Large Defect ◽  
Acetabular Bone ◽  
Acetabular Bone Defect ◽  
Increased Risk ◽  
Acetabular Bone Defects ◽  
Von Mises ◽  
Von Mises Stresses

Burch-Schneider cages are often used for the treatment of acetabular bone defects. In several clinical studies these cages have shown good mid- to long-term results. However, a higher failure rate has been reported in large Paprosky IIIB defects compared with smaller Paprosky II-IIIA defects. This study aims to investigate the effect of cage support on cage failure by means of finite element analysis. The Von Mises stresses in both the implant and the bone are analyzed for a Burch-Schneider cage used in the following scenarios: (1) a large acetabular bone defect, (2) a small acetabular bone defect and (3) a large acetabular bone defect in combination with a reinforcement plate. The results show that implant and bone stresses are higher in the large defect (99th percentile of 146.6 and 73.5 MPa respectively) than in the small defect (99th percentile of 43.9 and 47.9 MPa respectively). Adding a reinforcement plate to posteriorly support the cage decreases the stresses but not fully compensates for the missing bone support (99th percentile of 93.1 and 55.3 MPa respectively). Since high stresses cause an increased risk for fatigue failure and implant loosening, sufficient implant support is required to reduce the risk of cage failure.

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