scholarly journals De-escalation exchange of loosened locked revision stems to a primary stem design: Complications, stem fixation and bone reconstruction in 15 cases

2012 ◽  
Vol 98 (2) ◽  
pp. 138-143 ◽  
Author(s):  
B. Miletic ◽  
O. May ◽  
N. Krantz ◽  
J. Girard ◽  
G. Pasquier ◽  
...  
Keyword(s):  
Bone Reconstruction ◽  
Stem Design ◽  
Primary Stem

New Model of Bone Reconstruction Specially Designed for Skull Base Surgery—Long-Term Testing in Primates

Skull Base ◽  
2007 ◽  
Vol 17 (S 1) ◽  
Author(s):  
Cleopatra Charalampaki ◽  
Axel Heimann ◽  
Laszlo Kopacs ◽  
Oliver Kempski
Keyword(s):  
Skull Base ◽  
Skull Base Surgery ◽  
Bone Reconstruction ◽  
New Model

Educational STEM designing of virtual and real devices on the Arduino platform

2020 ◽  
pp. 17-27
Author(s):  
S. G. Grigoriev ◽  
M. V. Kurnosenko ◽  
A. M. Kostyuk
Keyword(s):  
Virtual Environments ◽  
Electronic Devices ◽  
Practical Training ◽  
Full Time ◽  
Stem Design ◽  
Face To Face ◽  
Interdisciplinary Knowledge ◽  
Virtual Modeling ◽  
Surface Mounting

The article discusses possible forms of educational STEM projects in the field of electronics and device control using Arduino controllers. As you know, the implementation of such STEM projects can be carried out not only using various electronic constructors, but also using virtual modeling environments. The knowledge obtained during modeling in virtual environments makes it possible to increase the efficiency of face-to-face practical training with a real constructor, and to improve the quality of students’ knowledge. The use of virtual modeling environments in combination with the use of real constructors provides links between distance and full-time learning. A real constructors can be used simultaneously by both the teacher and the student, jointly practicing the features of solving practical problems. The article provides examples of using a virtual environment for preliminary prototyping of circuits available in the documentation for electronic constructors, to familiarize students with the basics of designing and assembling electronic circuits using the surface mounting method and on a breadboard, as well as programming controllers on the Arduino platform that control electronic devices. This approach allows students to accelerate the assimilation of various interdisciplinary knowledge in the field of natural sciences using STEM design.

scholarly journals Modular tapered conical revision stem in hip revision surgery: mid- term results

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Loris Perticarini ◽  
Stefano Marco Paolo Rossi ◽  
Alberto Fioruzzi ◽  
Eugenio Jannelli ◽  
Mario Mosconi ◽  
...  
Keyword(s):  
Preoperative Assessment ◽  
Bone Defects ◽  
Implant Design ◽  
Harris Hip Score ◽  
Radiographic Evaluation ◽  
Stem Design ◽  
Additional Surgery ◽  
Prime Concern ◽  
Distal Fixation

Abstract Background The aim of this paper is to evaluate the clinical and radiological outcomes of a fluted tapered modular distal-fixation stem at medium to long-term follow-up. The hypothesis of this investigation was to verify if the use of this implant design may have provided potential advantages in femoral revisions and post-traumatic instances where the restoration of the anatomy was the prime concern. Methods We retrospectively reviewed 62 cases of femoral revision surgeries, performed in Paprosky type IIIA and IIIB bone defects between January 2001 and December 2011 with a mean follow-up of 8.5 ± 1.5 years (range 5.1–15.9 years) where a modular fluted stem was used. The clinical assessment was performed with the Harris Hip Score (HHS), and the radiographic evaluation was carried in order to assess the stability of the femoral component. Intra-operative and postoperative complications were recorded, and the rates of complications and revisions for any cause were determined. Results Mean HHS improved 35.4 points from the preoperative assessment. Radiographic evaluation showed a stable stem anchorage in 90.3% of the cases at the last follow-up. Five (8%) implants required additional surgery. Neither breakage of the stem nor loosening of the taper junction were recorded. Kaplan-Meier survivorship was 89.4% (CI: 88.8–90%) for any complication and 92.3% (CI: 91.8–92.7%) according to revision for any causes at 81 months follow-up. Conclusions Our findings suggest that this stem design is a reliable option in cases of complex femoral bone defects, as well as in cases with high functional deficiencies, with promising survivorship.

scholarly journals Short-stem total hip arthroplasty is not associated with an earlier return to work compared to a straight-stem design

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Georg Hauer ◽  
Maria Smolle ◽  
Sabrina Zaussinger ◽  
Joerg Friesenbichler ◽  
Andreas Leithner ◽  
...  
Keyword(s):  
Total Hip Arthroplasty ◽  
Sick Leave ◽  
Return To Work ◽  
Hip Arthroplasty ◽  
Short Stem ◽  
Multivariate Linear Regression Analysis ◽  
Stem Design ◽  
Total Hip ◽  
Straight Stem ◽  
Significant Difference

AbstractReturn to work (RTW) has been specifically identified as a high priority in patients undergoing total hip arthroplasty (THA). This investigation sought to assess the effect of the stem design on patients’ RTW. Secondly, the study aimed to identify risk factors that lead to a delayed RTW. Questionnaires inquiring about RTW, employment history, educational level, type of work, physical demands and joint awareness were administered by post. Further data were collected from patients’ hospital records. 176 patients who underwent THA using a short-stem and 97 patients using a straight-stem design were compared. The median return to work time was 10 weeks [IQR 7–14 weeks], with no significant difference between the two groups (short stems vs. straight stems; 10 [IQR 7–14] vs. 11 [7.5–13.5] weeks; p = 0.693). In the multivariate linear regression analysis, self-employment vs. employee (p = 0.001), dimension of preoperative workload (p = 0.001), preoperative sick leave (p < 0.001), and hospital length of stay (LOS) (p < 0.001) independently affected the period until work was resumed. The Forgotten-Joint-Score-12 showed no significant difference between the two groups. The data show that the majority of THA patients can expect to resume work and stem design has no impact on RTW. Employees with preoperative sick leave, prolonged hospital LOS and low workload are at higher risk for a delayed RTW.

HA/MgO nanocrystals hybrid hydrogel integrated with the tough mechanical strength and the osteoinductive potential for bone reconstruction of diabetic rats

2020 ◽  
Author(s):  
Rui Chen ◽  
Hang-Bo Chen ◽  
Pengpeng Xue ◽  
Wai-Geng Yang ◽  
Lan-zi Luo ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Mechanical Strength ◽  
Bone Repair ◽  
Diabetic Rats ◽  
Regeneration Process ◽  
Bone Reconstruction ◽  
Hybrid Hydrogel ◽  
Osteoinductive Potential

Bone repair and regeneration process is markedly impaired in diabetes mellitus (DM). The similar intervening approaches developed for the normal healing conditions have been still adopted to combat the DM-associated...

scholarly journals Vancouver B and C periprosthetic fractures around the cemented Exeter Stem: sex is associate with fracture pattern

2021 ◽  
Author(s):  
M. F. R. Powell-Bowns ◽  
E. Oag ◽  
D. Martin ◽  
N. D. Clement ◽  
C. E. H. Scott
Keyword(s):  
Multivariate Analysis ◽  
Interobserver Reliability ◽  
Univariate Analysis ◽  
Intraclass Correlation ◽  
Cement Mantle ◽  
Mantle Length ◽  
Periprosthetic Fractures ◽  
Stem Design ◽  
Female Sex ◽  
Radiographic Measurements

Abstract Introduction The aim of this study was to identify factors associated with the level of periprosthetic fracture involving a cemented polished tapered stem: Vancouver B or Vancouver C. Methods A retrospective cohort study of 181 unilateral periprosthetic fractures involving Exeter stems was assessed by three observers (mean age 78.5, range 39–103; mean BMI 27.1, 17–39; 97 (54%) male). Patient demographics, deprivation scores, BMI and time since primary prosthesis were recorded. Femoral diameter, femoral cortical thickness, Dorr classification and distal cement mantle length were measured from calibrated radiographs. Interobserver reliability was calculated using intraclass correlation coefficients (ICCs). Univariate and multivariate analysis was performed to identify associations with Vancouver B or C fractures. Results 160/181 (88%) Vancouver B and 21/181 (12%) Vancouver C-level fractures occurred at a mean of 5.9 ± 5.4 years (0.2–26.5) following primary surgery. Radiographic measurements demonstrated excellent agreement (ICC > 0.8, p < 0.001). Mortality was significantly higher following Vancouver C compared to B fractures: 90 day 14/160 Vs 5/21 (p = 0.05); 1 year 29/160 Vs 8/21 (p = 0.03). Univariate analysis demonstrated that Vancouver C fractures were associated with female sex, bisphosphonate use, cortical bone thickness, and distal cement mantle length (p < 0.05). On multivariate analysis, only female sex was an independent predictor of Vancouver C-level fractures (R2 =0.354, p = 0.005). Conclusion Most PFFs involving the Exeter stem design are Vancouver B-type fractures and appear to be independent of osteoporosis. In contrast, Vancouver C periprosthetic fractures display typical fragility fracture characteristics and are associated with female sex, thinner femoral cortices, longer distal cement mantles and high mortality.

scholarly journals Tissue-engineered autologous grafts for facial bone reconstruction

2016 ◽  
Vol 8 (343) ◽  
pp. 343ra83-343ra83 ◽  
Author(s):  
Sarindr Bhumiratana ◽  
Jonathan C. Bernhard ◽  
David M. Alfi ◽  
Keith Yeager ◽  
Ryan E. Eton ◽  
...  
Keyword(s):  
Bone Reconstruction ◽  
Facial Bone ◽  
Autologous Grafts
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