scholarly journals Evaluation of the feasibility of acetabular cup pre-determination in revision total hip arthroplasty via X-ray of the bone stock of the anterosuperior acetabulum

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Jingwei Zhang ◽  
Keyu Kong ◽  
Yingjun Chi ◽  
Xiaoliang Liu ◽  
Yiming Zeng ◽  
...  
Keyword(s):  
Contact Line ◽  
Primary Stability ◽  
Roc Curves ◽  
Line Length ◽  
Contact Length ◽  
Bone Stock ◽  
Acetabular Cup ◽  
X Ray ◽  
Revision Tha ◽  
Cage Group

Abstract Purpose This study was aimed to explore (1) location on AP pelvic X-ray that displayed bone stock in anterosuperior acetabulum; (2) whether X-ray could provide enough evidence to evaluate whether bone stock could provide support for acetabular cup; (3) criteria to determine whether anterosuperior bone stock could provide sufficient support for cup on X-ray. Methods Our study retrospectively collected 43 patients who underwent revision THA for cup loosening from 2014 to 2019. The position of anterosuperior acetabular bone stock was compared between X-ray and CT-based 3-D reconstruction. Seventy-millimeter acetabular cup was implanted simulatively to obtain the contact line between acetabular cup and superolateral remaining bone stock. The contact line length and the angle were measured. Patients were divided into cup group and cage group, and ROC curves of both contact line length and angle were drawn. Results The superolateral part of acetabulum on X-ray could reflect the anterosuperior host bone stock of acetabulum according to the comparison of anteroposterior pelvic X-ray and 3-D reconstruction. Critical point was chosen when we got the highest sensitivity with a 100% specificity in ROC curves. The critical values of contact length and angle were 15.58 mm and 25.5°. Conclusions Surgeons could assess the anterosuperior bone stock of acetabulum by AP pelvic X-ray to decide whether revision could be done merely using cup or need customized cage. Clinically, when contact line length was larger than 16 mm or contact angle was larger than 25.5°, adoption of cup could obtain primary stability in the revision surgery in most cases.

scholarly journals Influence of Synthetic Bone Substitutes on the Anchorage Behavior of Open-Porous Acetabular Cup

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1052 ◽  
Author(s):  
Volker Weißmann ◽  
Tim Ramskogler ◽  
Christian Schulze ◽  
Rainer Bader ◽  
Harald Hansmann
Keyword(s):  
Primary Stability ◽  
Bone Substitutes ◽  
Fixation Strength ◽  
Bone Stock ◽  
Structural Elements ◽  
Acetabular Cup ◽  
Load Bearing ◽  
Synthetic Bone ◽  
Press Fit ◽  
Pull Out

Background: The development in implants such as acetabular cups using additive manufacturing techniques is playing an increasingly important role in the healthcare industry. Method: This study compared the primary stability of four selectively laser-melted press-fit cups (Ti6Al4V) with open-porous, load-bearing structural elements on the surface. The aim was to assess whether the material of the artificial bone stock affects the primary stability of the acetabular cup. The surface structures consist of repeated open-porous, load-bearing elements orthogonal to the acetabular surface. Experimental pull-out and lever-out tests were performed on exact-fit and press-fit cups to evaluate the primary stability of the cups in different synthetic bone substitutes. The acetabular components were placed in three different commercially available synthetic materials (ROHACELL-IGF 110, SikaBlock M330, Sawbones Solid Rigid). Results & conclusions: Within the scope of the study, it was possible to show the differences in fixation strength between the tested acetabular cups depending on their design, the structural elements used, and the different bone substitute material. In addition, functional correlations could be found which provide a qualitative reference to the material density of the bone stock and the press-fit volume of the acetabular cups.

Explainable Prediction of Whether The Acetabular Cup Is Placed in The “Safe Zone” from X-ray Images

2021 ◽  
Author(s):  
Fuchang Han ◽  
Shenghui Liao ◽  
Chao Xiong ◽  
Haitao Wei ◽  
Renzhong Wu ◽  
...  
Keyword(s):  
Safe Zone ◽  
Acetabular Cup ◽  
X Ray

scholarly journals Use of a New Off-the-shelf 3D-printed Trabecular Titanium Acetabular Cup in Chinese Patients Undergoing Hip Revision Surgery: Short- to Mid-term Clinical and Radiological Outcomes

2021 ◽  
Author(s):  
Guangqian Shang ◽  
Shuai Xiang ◽  
Cuicui Guo ◽  
Jianjun Guo ◽  
Peng Wang ◽  
...  
Keyword(s):  
Bone Ingrowth ◽  
Chinese Patients ◽  
Control Group ◽  
Upward Movement ◽  
Observation Group ◽  
Acetabular Cup ◽  
Sf 36 ◽  
Revision Tha ◽  
3D Printed

Abstract Background: Revision total hip arthroplasty (THA) has been a challenge for surgeons. The purpose of this study was to explore the short-to mid-term clinical and radiological outcomes of Chinese patients who underwent revision THA using a new off-the-shelf three-dimensional (3D)-printed trabecular titanium (TT) acetabular cup by comparison with a conventional porous coated titanium acetabular cup, to provide a reference for the recommendation of this prostheses.Methods: A retrospective analysis of 57 patients (57 hips) who received revision THA was performed from January 2016 to June 2019. A total of 23 patients received 3D-printed cups (observation group) and 34 patients received non-3D-printed cups (control group). Clinical scores including Visual Analogue Scale (VAS), Harris Hip Score (HHS) and Short Form 36 (SF-36), upward movement of the hip center of rotation（HCOR）and limb-length discrepancy (LLD), stabilization and bone ingrowth of cups were compared between two groups. The multivariate linear regression was used to determine the factors potentially influencing the HHS score. Postoperative complications in the two groups were also recorded. Results: All 57 patients were routinely followed up. The average follow-up durations in the control and observation groups were 43.57 ± 13.68 (24–65) months and 41.82 ± 11.44 (24–64) months, respectively (p = 0.618). The postoperative clinical scores significantly improved in both groups compared to the preoperative scores (p < 0.05). The VAS score did not significantly differ between the groups at 3 or 12 months postoperatively, or at the last follow-up (p > 0.05). The HHS and SF-36 scores did not significantly differ between the groups at 3 months postoperatively (p > 0.05) but differed at 12 months postoperatively and the last follow-up (p < 0.05). Compared with the control group, the postoperative recovery of HCOR and LLD was better in the observation group (p < 0.05). All cups remained stable, with no loosening throughout the follow-up period. But the observation group had a significantly better rate of bone ingrowth compared to the control group (p = 0.037). Multivariate linear regression analysis showed that different cup types, upward movement of the HCOR, and LLD influenced the HHS score at the last follow-up (p < 0.05). None of the patients exhibited severe postoperative complications.Conclusion: The new off-the-shelf 3D-printed TT acetabular cup demonstrated encouraging short-to mid-term clinical outcomes in Chinese patients. It can effectively relieve pain, improve hip function, provide satisfactory biological fixation and high survival rate. But further follow up is necessary to assess its long-term outcomes.

The Role of Clinical “Experience” in Diagnostic Performance

1998 ◽  
Vol 18 (2) ◽  
pp. 163-167 ◽  
Author(s):  
Angelo Fasoli ◽  
Silvia Lucchelli ◽  
Renato Fasoli
Keyword(s):  
Pulmonary Embolism ◽  
Multiple Regression ◽  
Clinical Experience ◽  
Diagnostic Performance ◽  
Roc Curves ◽  
Clinical Findings ◽  
X Ray ◽  
Biochemical Studies ◽  
Recorded Data

Twenty-one physicians examined records of 43 patients who had attended the hospital because of chest pain. Of these patients, 20 had had coronary heart disease (CHD), 15 had had nonspecific pain, and eight had had pulmonary embolism. The physicians indicated the probability of CHD in each case on the basis of 18 clinical findings, not including ECG, x-ray, or biochemical studies. The trial was repeated five years later, using the same records, by 16 of the same physicians. Diagnostic accuracy was evaluated by ROC curves, and the weight ascribed to each cue was inferred by multiple regression with estimated probability of CHD as the dependent variable. No significant change of areas under the ROC curves with increasing length of clinical experience was observed. Multiple regression was significant in 30 of 37 analyses. The distributions of most physicians' estimates of probabilities had similar shapes five years apart. It is concluded that “experience” does not have a clear role in diagnostic performance based on recorded data and that personal calibration and preferences in estimating probabilities often persist for years.

The synergetic effect of pelvic rotation and X-ray offset on radiographic angles of the acetabular cup

2019 ◽  
Vol 57 (11) ◽  
pp. 2359-2371
Author(s):  
Jing-Xin Zhao ◽  
Xiu-Yun Su ◽  
Zhe Zhao ◽  
Ruo-Xiu Xiao ◽  
Guo-Fei Sun ◽  
...  
Keyword(s):  
Synergetic Effect ◽  
Acetabular Cup ◽  
Pelvic Rotation ◽  
X Ray

Measuring anatomical acetabular cup orientation with a new X-ray technique

2006 ◽  
Vol 11 (2) ◽  
pp. 69-75 ◽  
Author(s):  
Otto Müller ◽  
Patrik Reize ◽  
Dirk Trappmann ◽  
Nikolaus Wülker
Keyword(s):  
Acetabular Cup ◽  
X Ray

Study on the Characteristics of Contact Line and Liquid Film in Rectangular Microgrooves Under Vibration Conditions

2011 ◽  
Author(s):  
Wei Cao ◽  
Xuegong Hu ◽  
Chaohong Guo ◽  
Dawei Tang
Keyword(s):  
Liquid Film ◽  
Contact Line ◽  
Heat Input ◽  
High Speed ◽  
Mechanical Vibration ◽  
Line Length ◽  
Oscillation Period ◽  
Wide Field ◽  
High Speed Camera ◽  
Phase Contact

With the help of a high-speed camera (30000 Frames/second) and a wide-field stereo-microscope, the effects of mechanical vibration on the meniscus film and triple-phase contact line in rectangular microgrooves were experimentally investigated. Distilled water was used as working liquid. The images of the oscillated meniscus film in an oscillation period were captured through the high speed camera and they were analyzed using a MATLAB program. The results show that as the vibration table moves upward, the length of contact line increases; as the vibration table moves downward, the length of contact-line decreases. During the oscillation, the axial liquid film spreads upward further along the microgrooves and the deformation of the contact line becomes more obvious. The increase of the triple-phase contact line length caused by the external mechanical vibration is helpful for contact line heat transfer enhancement. Besides, deformation curve of the contact line with and without heat input under different vibration conditions is similar, while the contact line with heat input is shorter.

scholarly journals Mode Bifurcation on Contact Line Dynamics at Oil/Water Interface Depending on the Contact Line Length

2021 ◽  
Vol 9 ◽  
Author(s):  
Daigo Yamamoto ◽  
Jumpei Maeno ◽  
Yuki Manabe ◽  
Yasunao Okamoto ◽  
Erika Nawa-Okita ◽  
...  
Keyword(s):  
Contact Line ◽  
Glass Tube ◽  
Glass Container ◽  
Line Length ◽  
Water Interface ◽  
Wave Patterns ◽  
Glass Tubes ◽  
Inner Diameter ◽  
Contact Line Motion ◽  
Oil Water

The motion of the contact line at the oil/water interface caused by chemical reactions is well known as a typical example of artificial active matter in the field of nonlinear science. When water (containing trimethylstearylammonium chloride) and nitrobenzene (containing iodide anion) phases are in contact, the regulated traveling-wave patterns appear along the inner wall of the glass container. In this study, we demonstrate a new dynamical mode of the contact line, an up-and-down motion, which becomes dominant with the decrease in the size of a glass tube, and the probability of occurrence is extremely high when the diameter of the glass tube is below 1 mm. A physicochemical model of the contact line motion that incorporates the spatiotemporal variation of the surfactant concentration on a glass surface is proposed, and its effect on the wettability of oil/water phases on the walls of the glass tubes is studied. The present model can reproduce the mode bifurcation of the dynamical motion depending on the inner diameter of the glass tubes.

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.

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