scholarly journals Development of a Novel in Silico Model to Investigate the Influence of Radial Clearance on the Acetabular Cup Contact Pressure in Hip Implants

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1282 ◽  
Author(s):  
Saverio Affatato ◽  
Massimiliano Merola ◽  
Alessandro Ruggiero
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
In Silico ◽  
Element Model ◽  
Wear Testing ◽  
Radial Clearance ◽  
Maximum Pressure ◽  
Acetabular Cup ◽  
Hip Joint Replacement ◽  
Total Hip

A hip joint replacement is considered one of the most successful orthopedic surgical procedures although it involves challenges that must be overcome. The patient group undergoing total hip arthroplasty now includes younger and more active patients who require a broad range of motion and a longer service lifetime of the implant. The current replacement joint results are not fully satisfactory for these patients’ demands. As particle release is one of the main issues, pre-clinical experimental wear testing of total hip replacement components is an invaluable tool for evaluating new implant designs and materials. The aim of the study was to investigate the cup tensional state by varying the clearance between head and cup. For doing this we use a novel hard-on-soft finite element model with kinematic and dynamic conditions calculated from a musculoskeletal multibody model during the gait. Four different usual radial clearances were considered, ranging from 0 to 0.5 mm. The results showed that radial clearance plays a key role in acetabular cup stress-strain during the gait, showing from the 0 value to the highest, 0.5, a difference of 44% and 35% in terms of maximum pressure and deformation, respectively. Moreover, the presented model could be usefully exploited for complete elastohydrodynamic synovial lubrication modelling of the joint, with the aim of moving towards an increasingly realistic total hip arthroplasty in silico wear assessment accounting for differences in radial clearances.

Experimental and Finite Element Investigation of Cementless Cup/Bone Interface After Total Hip Arthroplasty

2004 ◽  
Author(s):  
Ivan Zivkovic ◽  
Farid Amirouche ◽  
Francisco Romero ◽  
Mark Gonzalez
Keyword(s):  
Finite Element ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Bone Ingrowth ◽  
Element Model ◽  
Loading Conditions ◽  
Acetabular Cup ◽  
Bone Interface ◽  
Total Hip ◽  
Cementless Cup

Permanent fixation of a cementless total hip arthroplasty requires bone ingrowth into the femoral and acetabular components. Early micromotion at the acetabular cup/bone interface can preclude ingrowth threatening long term fixation. To better characterize micromotion of the interface under loading conditions, an experimental and finite element (FE) study was undertaken. In this study cadaver hemi-pelvises were implanted with cementless acetabular cups and subjected to cyclical axial load and torque. Detailed finite element model, validated with experimental results, was developed to further analyze the conditions affecting the initial stability and loosening of the interface for different loading conditions.

scholarly journals Effects of the depth of the acetabular component during simulated acetabulum reaming in total hip arthroplasty

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jianlin Zuo ◽  
Meng Xu ◽  
Xin Zhao ◽  
Xianyue Shen ◽  
Zhongli Gao ◽  
...  
Keyword(s):  
Stress Concentration ◽  
Total Hip Arthroplasty ◽  
Acetabular Component ◽  
Hip Arthroplasty ◽  
Peak Stress ◽  
Element Model ◽  
Coverage Rate ◽  
Acetabular Cup ◽  
Total Hip ◽  
Rotation Center

AbstractWe aimed to evaluate whether there are differences in the rotation center, cup coverage, and biomechanical effects between conventional and anatomical technique. Computed tomography scans of 26 normal hips were used to simulate implantation of acetabular component. The hip rotation center and acetabular component coverage rate were calculated. Moreover, a finite element model of the hip joint was generated to simulate and evaluate the acetabular cup insertion. Micromotion and the peak stress distribution were used to quantify the biomechanical properties. The medial and superior shifts of the rotation center were 5.2 ± 1.8 mm and 1.6 ± 0.7 mm for the conventional reaming technique and 1.1 ± 1.5 mm and 0.8 ± 0.5 mm for anatomical technique, respectively. The acetabular component coverage rates for conventional reaming technique and anatomical technique were 86.8 ± 4% and 70.0 ± 7%, respectively. The micromotion of the cup with conventional reaming technique was greater than that with anatomical technique. The peak stress concentration was highest in the superior portion with conventional reaming technique, whereas with anatomical technique, there was no stress concentration. Paradoxically although the acetabular component coverage rate is larger with conventional reaming technique, anatomical technique provides less micromotion and stress concentration for initial cup stability. Thus, anatomical technique may be more suitable for acetabulum reaming during primary total hip arthroplasty.

CT-based automated planning of acetabular cup for total hip arthroplasty (THA) based on hybrid use of two statistical atlases

2016 ◽  
Vol 11 (12) ◽  
pp. 2253-2271 ◽  
Author(s):  
Yoshiyuki Kagiyama ◽  
Itaru Otomaru ◽  
Masaki Takao ◽  
Nobuhiko Sugano ◽  
Masahiko Nakamoto ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Automated Planning ◽  
Acetabular Cup ◽  
Total Hip

Assessment of an Orthopaedic Templating Software Package for Uncemented Total Hip Arthroplasty

2020 ◽  
Vol 4 (04) ◽  
pp. 155-157
Author(s):  
Michael Newman ◽  
David Hartwright
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Acetabular Cup ◽  
Total Hip ◽  
Pelvic Radiograph ◽  
Uncemented Total Hip Arthroplasty ◽  
Femoral Stems ◽  
Hip Arthroplasties ◽  
Acetabular Components ◽  
Insight Into

AbstractThe aim of this study was to assess a large, single-surgeon dataset of uncemented total hip arthroplasties that had been templated using software. This assessment compared preoperative templated predictions with what was implanted with regard to (1) femoral prosthesis size and (2) acetabular cup size. The operation notes for two types of uncemented total hip arthroplasty performed by a single surgeon between January 9, 2008, and March 21, 2019, were assessed. The data were refined so that only those that were fully templated on a correctly calibrated pelvic radiograph were included. This provided a total of 153 cases. The predicted software template was compared with actual implanted component sizes. With regard to the femoral stems, the templating software was exactly correct in 45.75% of cases and was accurate to within one size in 87.59% of cases. With regard to the acetabular component, the templating software was exactly correct in 52.94% of cases and was accurate to within one size (2 mm) in 86.94% of cases. Templating software offers an accurate prediction of the size of uncemented femoral and acetabular components. In addition, the benefits of templating include cognitive rehearsal, insight into potentially challenging aspects of surgery, and highlighting intraoperative issues where there is a large intraoperative deviation from what is templated. This study demonstrates the congruence and reproducibility of templating software when compared with other smaller studies performed in the literature.

A new pin-on-disk wear testing method for simulating wear of polyethylene on cobalt-chrome alloy in total hip arthroplasty

2001 ◽  
Vol 16 (5) ◽  
pp. 658-665 ◽  
Author(s):  
Charles R. Bragdon ◽  
Daniel O. O'Connor ◽  
Jay D. Lowenstein ◽  
Murali Jasty ◽  
Stephen A. Biggs ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Wear Testing ◽  
Total Hip ◽  
Testing Method ◽  
Pin On Disk ◽  
Cobalt Chrome Alloy ◽  
Cobalt Chrome

scholarly journals Compression of the Femoral Vessels by a Pseudotumor after Metal-on-Metal Total Hip Arthroplasty

2017 ◽  
Vol 2017 ◽  
pp. 1-5
Author(s):  
Yasuaki Tamaki ◽  
Tomohiro Goto ◽  
Takahiko Tsutsui ◽  
Tomoya Takasago ◽  
Keizo Wada ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Vascular Compression ◽  
Acetabular Cup ◽  
Primary Metal ◽  
Total Hip ◽  
Circulatory Disturbance ◽  
Metal Head ◽  
Metal On Metal ◽  
Femoral Vessels

Here we present a case of pseudotumor following total hip arthroplasty (THA) that resulted in a circulatory disturbance caused by compression of the femoral vasculature. A 63-year-old man presented with pain, swelling, and redness of the left leg 5 years after primary metal-on-metal THA using the AML-Plus stem, Pinnacle® acetabular cup, and 36 mm diameter Ultamet™ metal head system (DePuy Orthopaedics, Warsaw, IN). Enhanced computed tomography and magnetic resonance imaging revealed a large cystic lesion extending from the left hip anteriorly to the intrapelvic region and compressing the left femoral vessels. Percutaneous puncture of the lesion yielded a dark red aspirate and the patient was diagnosed to have a pseudotumor causing compression of the femoral vessels. We performed revision surgery to replace the metal head and metal liner with a smaller ceramic head and polyethylene liner without removal of the stem. Corrosion of the head-neck junction was identified intraoperatively with no obvious wear on the bearing surfaces. The left leg swelling and redness improved immediately postoperatively. A large pseudotumor should be kept in mind as a cause of vascular compression with unilateral leg edema in a patient who has undergone metal-on-metal THA.

Failure Mode of Polyethylene Liner in Total Hip Arthroplasty with Harris-Galante II Acetabular Cup

2004 ◽  
Vol 39 (7) ◽  
pp. 766
Author(s):  
Byung Woo Min ◽  
Ki Cheol Bae ◽  
Kyung Jae Lee ◽  
Sung Won Sohn ◽  
Chul Hyung Kang
Keyword(s):  
Total Hip Arthroplasty ◽  
Failure Mode ◽  
Hip Arthroplasty ◽  
Polyethylene Liner ◽  
Acetabular Cup ◽  
Total Hip
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