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Femoral stem design

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https://www.readbyqxmd.com/read/28915961/short-stem-total-hip-arthroplasty-potential-explanations-for-persistent-post-surgical-thigh-pain
#1
Isabel A C Baert, Enrique Lluch, Francis Van Glabbeek, Rudy Nuyts, Salim Rufai, Joanna Tuynman, Filip Struyf, Mira Meeus
Short stem uncemented femoral implants were developed with the aim of preserving proximal bone stock for future revisions, improving biomechanical reconstruction, aiding insertion through smaller incisions and potentially decreasing or limiting the incidence of thigh pain. Despite all the advantages of short stem designs, it remains unclear whether they are able to limit post-surgical thigh pain. In patients with short stem hip arthroplasty and persistent thigh pain, it is of the utmost importance to understand the potential etiologies of this chronic pain for selecting the appropriate treatment strategy...
September 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28901195/feedforward-coordinate-control-of-a-robotic-cell-injection-catheter
#2
Weyland Cheng, Peter K Law
Remote and robotically actuated catheters are the stepping-stones toward autonomous catheters, where complex intravascular procedures may be performed with minimal intervention from a physician. This article proposes a concept for the positional, feedforward control of a robotically actuated cell injection catheter used for the injection of myogenic or undifferentiated stem cells into the myocardial infarct boundary zones of the left ventricle. The prototype for the catheter system was built upon a needle-based catheter with a single degree of deflection, a 3-D printed handle combined with actuators, and the Arduino microcontroller platform...
August 2017: Cell Transplantation
https://www.readbyqxmd.com/read/28888934/femoral-stem-incorporating-a-diamond-cubic-lattice-structure-design-manufacture-and-testing
#3
Bruno Jetté, Vladimir Brailovski, Mathieu Dumas, Charles Simoneau, Patrick Terriault
BACKGROUND: The current total hip prostheses with dense femoral stems are considerably stiffer than the host bones, which leads to such long-term complications as aseptic loosening, and eventually, the need for a revision. Consequently, the lifetime of the implantation does not match the lifetime expectation of young patients. METHOD: A femoral stem design featuring a porous structure is proposed to lower its stiffness and allow bone tissue ingrowth. The porous structure is based on a diamond cubic lattice in which the pore size and the strut thickness are selected to meet the biomechanical requirements of the strength and the bone ingrowth...
August 31, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28884275/alloy-microstructure-dictates-corrosion-modes-in-tha-modular-junctions
#4
Robin Pourzal, Deborah J Hall, Jonas Ehrich, Stephanie M McCarthy, Mathew T Mathew, Joshua J Jacobs, Robert M Urban
BACKGROUND: Adverse local tissue reactions (ALTRs) triggered by corrosion products from modular taper junctions are a known cause of premature THA failure. CoCrMo devices are of particular concern because cobalt ions and chromium-orthophosphates were shown to be linked to ALTRs, even in metal-on-polyethylene THAs. The most common categories of CoCrMo alloy are cast and wrought alloy, which exhibit fundamental microstructural differences in terms of grain size and hard phases. The impact of implant alloy microstructure on the occurring modes of corrosion and subsequent metal ion release is not well understood...
September 7, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28861191/porous-femoral-fixation-in-total-hip-arthroplasty-with-short-anatomical-stem-radiographic-evaluation
#5
Suresh Patil, Carrilero Luis, Henry Finn
BACKGROUND: Hip prostheses with short anatomical stems were designed for metaphyseal fixation and to spare bone stock. We present a study of a short anatomical femoral stem used in all age groups of patients with Dorr A and B type of femora. METHODS: We reviewed radiographs of 85 hips in 74 patients who had a cementless total hip arthroplasty with a short anatomical 80 mm femoral stem designed to achieve pure metaphyseal fixation. A ream-only technique was used for femoral canal preparation in all patients...
September 2017: Clinics in Orthopedic Surgery
https://www.readbyqxmd.com/read/28840118/designing-an-optimized-novel-femoral-stem
#6
Parto Babaniamansour, Mehdi Ebrahimian-Hosseinabadi, Anousheh Zargar-Kharazi
BACKGROUND: After total hip arthroplasty, there would be some problems for the patients. Implant loosening is one of the significant problems which results in thigh pain and even revision surgery. Difference between Young's modulus of bone-metal is the cause of stress shielding, atrophy, and subsequent implant loosening. MATERIALS AND METHODS: In this paper, femoral stem stiffness is reduced by novel biomechanical and biomaterial design which includes using proper design parameters, coating it with porous surface, and modeling the sketch by the software...
July 2017: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/28820728/radiostereometric-migration-measurement-of-an-uncemented-cerafit%C3%A2-femoral-stem-26-patients-followed-for-10-years
#7
Stefan Sesselmann, Yotung Hong, Frank Schlemmer, Isabell Hussnaetter, Lutz A Mueller, Raimund Forst, Franz Tschunko
Radiostereometric analysis (RSA) is the gold standard for evaluating micromotions of orthopaedic implants. The method is applied for identifying novel design weaknesses in endoprostheses. Current research frequently assesses relatively short time periods. Short-term RSA studies have been widely used for predicting the long-term stability of many hip prosthetic designs, but only a few studies have focused on uncemented hip implants, especially for extended periods. The purpose of this study was to analyse the migration pattern of the Cerafit® femoral stem within 10 years and to verify the predictive value of short-term RSA after 2 years for this uncemented femoral hip stem...
August 18, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28793976/influence-of-implant-length-and-bone-defect-situation-on-primary-stability-after-distal-femoral-replacement-in-vitro
#8
Jan Nadorf, Simon B Klein, Simone Gantz, Eike Jakubowitz, Jan Philippe Kretzer, Oliver E Bischel
BACKGROUND: Aseptic loosening is the major reason for failure of distal femoral replacement using current modular megaprostheses. Although the same stems are used for proximal and distal replacement, survival rates in clinical studies with distal reconstruction were lower within the same system compared to proximal reconstruction. We analyzed whether primary stability as presupposition for long-term fixation can be achieved with a current tapered stem design. Additionally, we hypothesized that stem length affects primary stability depending on bone defect situations...
August 6, 2017: Knee
https://www.readbyqxmd.com/read/28717644/optimization-of-a-functionally-graded-material-stem-in-the-femoral-component-of-a-cemented-hip-arthroplasty-influence-of-dimensionality-of-fgm
#9
Abdellah Ait Moussa, Rohan Yadav
The longevity of hip prostheses is contingent on the stability of the implant within the cavity of the femur bone. The cemented fixation was mostly adopted owing to offering the immediate stability from cement-stem and cement-bone bonding interfaces after implant surgery. Yet cement damage and stress shielding of the bone were proven to adversely affect the lifelong stability of the implant, especially among younger subjects who tend to have an active lifestyle. The geometry and material distribution of the implant can be optimized more efficiently with a three-dimensional realistic design of a functionally graded material (FGM)...
2017: Journal of Medical Engineering
https://www.readbyqxmd.com/read/28693543/finite-element-analysis-of-porously-punched-prosthetic-short-stem-virtually-designed-for-simulative-uncemented-hip-arthroplasty
#10
Matthew Jian-Qiao Peng, Hai-Yan Chen, Yong Hu, XiangYang Ju, Bo Bai
BACKGROUND: There is no universal hip implant suitably fills all femoral types, whether prostheses of porous short-stem suitable for Hip Arthroplasty is to be measured scientifically. METHODS: Ten specimens of femurs scanned by CT were input onto Mimics to rebuild 3D models; their *stl format dataset were imported into Geomagic-Studio for simulative osteotomy; the generated *.igs dataset were interacted by UG to fit solid models; the prosthesis were obtained by the same way from patients, and bored by punching bears designed by Pro-E virtually; cements between femora and prosthesis were extracted by deleting prosthesis; in HyperMesh, all compartments were assembled onto four artificial joint style as: (a) cemented long-stem prosthesis; (b) porous long-stem prosthesis; (c) cemented short-stem prosthesis; (d) porous short-stem prosthesis...
July 11, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28648706/total-hip-intraoperative-femur-fracture-do-the-design-enhancements-of-a-second-generation-tapered-wedge-stem-reduce-the-incidence
#11
Nicholas D Colacchio, Claire E Robbins, Mehran S Aghazadeh, Carl T Talmo, James V Bono
BACKGROUND: Intraoperative femur fracture (IFF) is a well-known complication in primary uncemented total hip arthroplasty (THA). Variations in implant instrumentation design and operative technique may influence the risk of IFF. This study investigates IFF between a standard uncemented tapered-wedge femoral stem and its second-generation successor with the following design changes: size-specific medial curvature, proportional incremental stem growth, modest reduction in stem length, and distal lateral relief...
May 15, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28634092/alarmingly-high-rate-of-implant-fractures-in-one-modular-femoral-stem-design-a-comparison-of-two-implants
#12
Ritesh R Shah, Jeffrey M Goldstein, Nancy E Cipparrone, Alexander C Gordon, Matthew L Jimenez, Wayne M Goldstein
BACKGROUND: Reports of implant fracture at the modular junction have been seen in modular neck designs, stem-sleeve modular femoral stems, and diaphyseal engaging bi-body modular stems. To date, however, there has never been a direct comparison between 2 different implant designs from the same modular family. The purpose of this study is to compare the rate of implant failure of 2 such stem-sleeve modular femoral stem designs, the S-ROM and Emperion, to further identify factors which increase the risk of this mode of failure...
May 22, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28629234/healing-of-osteochondral-defects-via-endochondral-ossification-in-an-ovine-model
#13
Helen Lydon, Alan Getgood, Frances M D Henson
OBJECTIVE: The objective of this study was to describe the mechanism of healing of osteochondral defects of the distal femur in the sheep, a commonly used translational model. Information on the healing mechanism be useful to inform the design of tissue engineering devices for joint surface defect repair. DESIGN: A retrospective study was conducted examining 7-mm diameter osteochondral defects made in the distal medial femoral condyle of 40 adult female sheep, comprising control animals from 3 separate structures...
June 1, 2017: Cartilage
https://www.readbyqxmd.com/read/28608754/a-preliminary-study-comparing-microfracture-and-local-adherent-transplantation-of-autologous-adipose-derived-stem-cells-followed-by-intraarticular-injection-of-platelet-rich-plasma-for-the-treatment-of-chondral-defects-in-rabbits
#14
Timea Spakova, Judita Amrichova, Jana Plsikova, Denisa Harvanova, Slavomir Hornak, Valent Ledecky, Jan Rosocha
Objective This study aimed to compare microfracture and application of adipose-derived stem cells (ADSCs) by local adherent technique enhanced by platelet-rich plasma (PRP) to provide a new approach for the repair of cartilage defect. Design Full-thickness cylindrical defects were created in the medial femoral condyle in 9 New Zealand White rabbits (5 months old, 4.65 ± 0.20 kg). Two groups of rabbits ( n = 3) were either treated with ADSCs (Group 1) or the microfracture technique (Group 2) following intraarticular injection of PRP 3 times in weekly intervals...
June 1, 2017: Cartilage
https://www.readbyqxmd.com/read/28589313/effect-of-a-collar-on-subsidence-and-local-micromotion-of-cementless-femoral-stems-in-vitro-comparative-study-based-on-micro-computerised-tomography
#15
Valérie Malfroy Camine, Hannes A Rüdiger, Dominique P Pioletti, Alexandre Terrier
PURPOSE: The aim of this study is to quantitatively compare the difference in primary stability between collarless and collared versions of the same femoral stem. Specifically, we tested differences in subsidence and micromotion. METHODS: Collarless and collared versions of the same cementless femoral stem were implanted in two groups of six fresh-frozen cadaveric femurs. Each implanted femur was then subsequently tested for axial compressive and torsional loadings...
June 7, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28579018/does-using-a-polyethylene-rm-press-fit-cup-modify-the-preparation-of-the-acetabulum-and-acetabular-offset-in-primary-hip-arthroplasty
#16
R Erivan, S Aubret, G Villatte, A Mulliez, S Descamps, S Boisgard
INTRODUCTION: When performing total hip arthroplasty (THA), it is important to maintain the femoral and acetabular offsets to ensure good joint stability and to restore the function of the hip abductor muscles. In our practice, we mainly use a lateralized stem and hollow out the acetabulum to the quadrilateral plate to accommodate a press-fit polyethylene cup. However, the repercussions of this preparation method, which is driven by the cup's design, are not known. We carried out a retrospective study to assess: (1) the changes in the femoral and acetabular offset; (2) the height of the center of rotation; and (3) the repercussions on wear...
June 1, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28578471/retrieval-evidence-of-impingement-at-the-third-articulation-in-contemporary-dual-mobility-cups-for-total-hip-arthroplasty
#17
Anna Di Laura, Harry S Hothi, Johann Henckel, Arianna Cerquiglini, Ming Han Lincoln Liow, Young-Min Kwon, John A Skinner, Alister J Hart
PURPOSE: We aimed to assess polyethylene liners of retrieved hips of one design of a dual mobility (DM) cup liner and two designs of femoral stems to better understand the role of femoral stem design on polyethylene impingement. METHODS: This was a case-control study involving 70 retrieved highly cross-linked polyethylene (X3) liners used with ABGII (n = 35) and Rejuvenate (n = 35) stems (Stryker). All polyethylene liners were assessed for evidence of rim deformation and the damage quantified using metrology methods...
June 4, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28566326/retrieval-analysis-of-metal-and-ceramic-femoral-heads-on-a-single-cocr-stem-design
#18
A Di Laura, H Hothi, J Henckel, I Swiatkowska, M H L Liow, Y-M Kwon, J A Skinner, A J Hart
OBJECTIVES: The use of ceramic femoral heads in total hip arthroplasty (THA) has increased due to their proven low bearing wear characteristics. Ceramic femoral heads are also thought to reduce wear and corrosion at the head-stem junction with titanium (Ti) stems when compared with metal heads. We sought to evaluate taper damage of ceramic compared with metal heads when paired with cobalt chromium (CoCr) alloy stems in a single stem design. METHODS: This retrieval study involved 48 total hip arthroplasties (THAs) with CoCr V40 trunnions paired with either CoCr (n = 21) or ceramic (n = 27) heads...
May 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/28462906/biomimetic-design-and-fabrication-of-multilayered-osteochondral-scaffolds-by-low-temperature-deposition-manufacturing-and-thermal-induced-phase-separation-techniques
#19
Ting Zhang, Hefeng Zhang, Laquan Zhang, Shuaijun Jia, Jian Liu, Zhuo Xiong, Wei Sun
Integrative osteochondral repair is a useful strategy for cartilage-defect repair. To mimic the microenvironment, it is necessary that scaffolds effectively mimic the extracellular matrix of natural cartilage and subchondral bone. In this study, biomimetic osteochondral scaffolds containing an oriented cartilage layer, a compact layer, and a three-dimensional (3D)-printed core-sheath structured-bone layer were developed. The oriented cartilage layer was designed to mimic the structural and material characteristics of native cartilage tissue and was fabricated with cartilage matrix-chitosan materials, using thermal-induced phase-separation technology...
May 2, 2017: Biofabrication
https://www.readbyqxmd.com/read/28457199/bone-regeneration-mediated-by-a-bioactive-and-biodegradable-extracellular-matrix-like-hydrogel-based-on-elastin-like-recombinamers
#20
Dante J Coletta, Arturo Ibáñez-Fonseca, Liliana R Missana, María V Jammal, Ezequiel J Vitelli, Mariangeles Aimone, Facundo Zabalza, João P Mardegan Issa, Matilde Alonso, José Carlos Rodríguez-Cabello, Sara Feldman
The morbidity of bone fractures and defects is steadily increasing due to changes in the age pyramid. As such, novel biomaterials that are able to promote the healing and regeneration of injured bones are needed to overcome the limitations of auto-, allo-, and xenografts, while providing a ready-to-use product that may help to minimize surgical invasiveness and duration. In this regard, recombinant biomaterials, such as elastin-like recombinamers (ELRs), are very promising as their design can be tailored by genetic engineering, thus allowing scalable production and batch-to-batch consistency, among others...
August 22, 2017: Tissue Engineering. Part A
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