keyword
MENU ▼
Read by QxMD icon Read
search

Femoral stem design

keyword
https://www.readbyqxmd.com/read/28418269/is-a-hollow-centralizer-necessary-when-using-a-polished-tapered-cemented-femoral-stem
#1
Erik Weber, Christer Olsson, Uldis Kesteris, Gunnar Flivik
Background and purpose - A tapered, polished and collarless stem is normally equipped with a hollow centralizer to prevent the stem from becoming end-bearing in the cement as the stem subsides. In a randomized clinical trial, we evaluated such a stem (MS-30), which was initially introduced with a solid centralizer but was later recommended to be fitted with a hollow centralizer. We hypothesized that while the stem would sink more, it would become rotationally stable and have less retroversion with a hollow centralizer than with a solid centralizer...
April 18, 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28395391/dual-mobility-acetabular-cups-in-primary-total-hip-arthroplasty-in-patients-at-high-risk-for-dislocation
#2
Steven F Harwin, Jaydev B Mistry, Morad Chughtai, Anton Khlopas, Chukwuweike Gwam, Jared M Newman, Carlos A Higuera, Peter M Bonutti, Arthur L Malkani, Frank R Kolisek, Ronald E Delanois, Michael A Mont
INTRODUCTION: Postoperative dislocation occurs in approximately 2% of primary total hip arthroplasties (THAs). Risk factors associated with dislocation include: age of 70 years or older, body mass index (BMI) of 30 kg/m2 or greater, alcohol abuse, and neuro-degenerative diseases such as multiple sclerosis or Parkinson's disease. As a result, dual-mobility articulations, which have been typically used for revision procedures, have become an increasingly popular option for these "at risk" primary THAs...
April 11, 2017: Surgical Technology International
https://www.readbyqxmd.com/read/28392688/evaluation-of-zinc-doped-mesoporous-hydroxyapatite-microspheres-for-the-construction-of-a-novel-biomimetic-scaffold-optimized-for-bone-augmentation
#3
Weilin Yu, Tuan-Wei Sun, Chao Qi, Zhenyu Ding, Huakun Zhao, Shichang Zhao, Zhongmin Shi, Ying-Jie Zhu, Daoyun Chen, Yaohua He
Biomaterials with high osteogenic activity are desirable for sufficient healing of bone defects resulting from trauma, tumor, infection, and congenital abnormalities. Synthetic materials mimicking the structure and composition of human trabecular bone are of considerable potential in bone augmentation. In the present study, a zinc (Zn)-doped mesoporous hydroxyapatite microspheres (Zn-MHMs)/collagen scaffold (Zn-MHMs/Coll) was developed through a lyophilization fabrication process and designed to mimic the trabecular bone...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28391517/preoperative-digital-planning-versus-postoperative-outcomes-in-total-hip-arthroplasty-using-a-calcar-guided-short-stem-frequent-valgization-can-be-avoided
#4
Karl Philipp Kutzner, Joachim Pfeil, Mark Predrag Kovacevic
INTRODUCTION: Modern total hip arthroplasty is largely dependent on the successful preservation of hip geometry. Thus, a successful implementation of the preoperative planning is of great importance. The present study evaluates the accuracy of anatomic hip reconstruction predicted by 2D digital planning using a calcar-guided short stem of the newest generation. METHODS: A calcar-guided short stem was implanted in 109 patients in combination with a cementless cup using the modified anterolateral approach...
April 8, 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/28385929/cemented-versus-cementless-hemiarthroplasty-for-a-displaced-fracture-of-the-femoral-neck-a-systematic-review-and-meta-analysis-of-current-generation-hip-stems
#5
REVIEW
H D Veldman, I C Heyligers, B Grimm, T A E J Boymans
AIMS: Our aim was to prepare a systematic review and meta-analysis to compare the outcomes of cemented and cementless hemiarthroplasty of the hip, in elderly patients with a fracture of the femoral neck, to investigate the mortality, complications, length of stay in hospital, blood loss, operating time and functional results. MATERIALS AND METHODS: A systematic review and meta-analysis was conducted following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines on randomised controlled trials (RCTs), studying current generation designs of stem only...
April 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28375671/outcome-in-design-specific-comparisons-between-highly-crosslinked-and-conventional-polyethylene-in-total-hip-arthroplasty
#6
Per-Erik Johanson, Ove Furnes, Leif Ivar Havelin, Anne Marie Fenstad, Alma B Pedersen, Søren Overgaard, Göran Garellick, Keijo Mäkelä, Johan Kärrholm
Background and purpose - Most registry studies regarding highly crosslinked polyethylene (XLPE) have focused on the overall revision risk. We compared the risk of cup and/or liner revision for specific cup and liner designs made of either XLPE or conventional polyethylene (CPE), regarding revision for any reason and revision due to aseptic loosening and/or osteolysis. Patients and methods - Using the Nordic Arthroplasty Register Association (NARA) database, we identified cup and liner designs where either XLPE or CPE had been used in more than 500 THAs performed for primary hip osteoarthritis...
April 4, 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28363891/cement-in-cement-revision-of-the-femoral-stem-analysis-of-1179-first-time-revisions-in-the-swedish-hip-arthroplasty-register
#7
COMPARATIVE STUDY
P H J Cnudde, J Kärrholm, O Rolfson, A J Timperley, M Mohaddes
AIMS: Compared with primary total hip arthroplasty (THA), revision surgery can be challenging. The cement-in-cement femoral revision technique involves removing a femoral component from a well-fixed femoral cement mantle and cementing a new stem into the original mantle. This technique is widely used and when carried out for the correct indications, is fast, relatively inexpensive and carries a reduced short-term risk for the patient compared with the alternative of removing well-fixed cement...
April 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28300706/tapered-stems-one-third-proximally-coated-have-higher-complication-rates-than-cylindrical-two-third-coated-stems-in-patients-with-high-hip-dislocation-undergoing-total-hip-arthroplasty-with-step-cut-shortening-osteotomy
#8
V Emre Ozden, G Dikmen, B Beksac, I Remzi Tozun
BACKGROUND: The results of cementless stems in total hip arthroplasty (THA) done because of congenital dislocation with step-cut osteotomy is not well known, particularly the influence of the design and the role of extent of porous coating. Therefore we performed a retrospective study to evaluate the mid to long-term results THA performed with a single type acetabular component and different geometry and fixation type stems with ceramic bearings in the setting of step-cut subtrochanteric osteotomy in high hip dislocated (HHD) patients...
March 11, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28283706/three-dimensional-analysis-of-the-proximal-anterior-femoral-flare-and-torsion-anatomic-bases-for-metaphyseally-fixed-short-stems-design
#9
Elhadi Sariali, Yohan Knaffo
PURPOSE: The use of femoral stems with a short metaphyseal fixation may lead to fractures or subsidence. Such failures may be related to a mismatch between the torsions or the sagittal flares of the stem and the femur. The goal of our study was to perform a 3D analysis of the proximal metaphyseal femur anatomy with a special focus on the anterior proximal flare and torsion. Such data may help to detect the outlier patients for whom a short metaphyseal fixation should be avoided. METHODS: A prospective study included 80 consecutive patients who underwent a primary cementless THA with a 3D CT-scan based pre-operative planning...
March 10, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28271719/micromotion-induced-peri-prosthetic-fluid-flow-around-a-cementless-femoral-stem
#10
Valérie Malfroy Camine, Alexandre Terrier, Dominique P Pioletti
Micromotion-induced interstitial fluid flow at the bone-implant interface has been proposed to play an important role in aseptic loosening of cementless implants. High fluid velocities are thought to promote aseptic loosening through activation of osteoclasts, shear stress induced control of mesenchymal stem cells differentiation, or transport of molecules. In this study, our objectives were to characterize and quantify micromotion-induced fluid flow around a cementless femoral stem using finite element modeling...
March 8, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28262457/trochantoplasty-for-total-hip-arthroplasty-in-patients-with-coxa-vara-deformity
#11
Jun-Il Yoo, Javad Parvizi, Ji-Ung Song, Yong-Chan Ha, Young-Kyun Lee, Kyung-Hoi Koo
BACKGROUND: In total hip arthroplasty (THA) of hips with coxa vara, the femoral stems might be inserted in a varus alignment. To avoid varus insertion, we designed a technique, which we termed "trochantoplasty." In this procedure, the medial half of the greater trochanter was removed during THA. METHODS: We evaluated 30 patients (31 hips) who had coxa vara deformity and underwent THA using trochantoplasty at the mean follow-up of 5 years (range, 3-9 years). RESULTS: All stems were inserted in the neutral position...
February 14, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28249969/assessment-of-the-equivalence-of-a-generic-to-a-branded-femoral-stem
#12
COMPARATIVE STUDY
H Hothi, J Henckel, P Shearing, T Holme, A Cerquiglini, A Di Laura, A Atrey, J Skinner, A Hart
AIMS: The aim of this study was to compare the design of the generic OptiStem XTR femoral stem with the established Exeter femoral stem. MATERIALS AND METHODS: We obtained five boxed, as manufactured, implants of both designs at random (ten in total). Two examiners were blinded to the implant design and independently measured the mass, volume, trunnion surface topography, trunnion roughness, trunnion cone angle, Caput-Collum-Diaphyseal (CCD) angle, femoral offset, stem length, neck length, and the width and roughness of the polished stem shaft using peer-reviewed methods...
March 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28194710/exchangeable-femoral-neck-dual-modular-tha-prostheses-have-poorer-survivorship-than-other-designs-a-nationwide-cohort-of-324-108-patients
#13
Sandrine Colas, Assia Allalou, Antoine Poichotte, Philippe Piriou, Rosemary Dray-Spira, Mahmoud Zureik
BACKGROUND: Exchangeable neck stems, defined as those with a dual taper (that is, a modular junction between the femoral head and the femoral neck and an additional junction between the neck and the stem body), were introduced in THA to improve restoration of joint biomechanics (restoring anteversion, offset, and limb length) and reduce the risk of dislocation. However exchangeable necks have been reported to result in adverse effects such as stem fractures and acute local tissue reaction...
February 13, 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28176355/strain-shielding-inspired-re-design-of-proximal-femoral-stems-for-total-hip-arthroplasty
#14
Myriam Cilla, Sara Checa, Georg N Duda
A large number of hip prosthesis with different designs have been developed. However, the influence of hip implant design changes on the strains induced in the bone remains unclear. The purpose of this study is to better understand the mechanics of short stem total hip arthroplasty. Specifically, it investigates whether strain shielding can be avoided by changing implant shape and/or material properties. It is hypothesized that the re-design of existing implant designs can result in further reduction of strain shielding and thus keep bone loss minimal following total hip replacement...
February 8, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28167872/characterization-of-femoral-head-taper-corrosion-features-using-a-22-year-retrieval-database
#15
Jacob Cartner, Patrick Aldinger, Chenxi Li, David Collins
BACKGROUND: Modularity in total hip arthroplasty has been used for decades with great success, but new findings regarding corrosion artifacts have caused a resurgence in tapered junction research. Mechanically assisted crevice corrosion (MACC) is thought to be the mechanism by which corrosive attack occurs. Myriad multi-factorial variables are known to influence the susceptibility of a modular taper junction to MACC. Some of these variables are design and manufacture related and others can be controlled by the surgeon...
February 2017: HSS Journal: the Musculoskeletal Journal of Hospital for Special Surgery
https://www.readbyqxmd.com/read/28165591/stable-migration-pattern-of-an-ultra-short-anatomical-uncemented-hip-stem-a-prospective-study-with-2-years-radiostereometric-analysis-follow-up
#16
Ahmed Nageeb Mahmoud, Uldis Kesteris, Gunnar Flivik
INTRODUCTION: Shorter, anatomically shaped and proximally loading stems have been developed to achieve better stress distribution and be more bone preserving. The purpose of this prospective study was to evaluate the migration pattern of the Proxima™ ultra-short uncemented stem using radiostereometric analysis (RSA), and to review the literature regarding the migration of short stemmed hip arthroplasty. METHODS: 25 patients (28 hips) with hip osteoarthritis received a Proxima stem during total hip arthroplasty (THA)...
February 4, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/28159679/is-there-a-role-for-femoral-offset-restoration-during-total-hip-arthroplasty-a-systematic-review
#17
REVIEW
Marcello De Fine, Matteo Romagnoli, Angelo Toscano, Alice Bondi, Matteo Nanni, Stefano Zaffagnini
BACKGROUND: Benefits of femoral offset restoration during total hip arthroplasty should be the reduction of bearing surfaces wear, implant loosening and dislocation rates. Modular neck stems ensure offset customization, but fretting corrosion and catastrophic failures are well documented complications. Since clinical evidences are needed to substantiate the effectiveness of femoral offset restoration and promote modular neck choice, we systematically reviewed the literature to ascertain whether femoral offsetitself has a proven clinical influence: 1) on bearing surfaces wear, 2) implant loosening, 3) and dislocation rates...
January 31, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28130016/cortical-strut-allograft-support-of-modular-femoral-junctions-during-revision-total-hip-arthroplasty
#18
Chin Tat Lim, Derek F Amanatullah, James I Huddleston, Katherine L Hwang, William J Maloney, Stuart B Goodman
BACKGROUND: There is risk of junction failure when using modular femoral stems for revision total hip arthroplasty (THA), especially with loss of bone stock in the proximal femur. Using a cortical strut allograft may provide additional support of a modular femoral construct in revision THA. METHODS: We reviewed prospectively gathered clinical and radiographic data for 28 revision THAs performed from 2004 to 2014 using cementless modular femoral components with cortical strut allograft applied to supplement proximal femoral bone loss: 5 (18%) were fluted taper designs and 23 (82%) were porous cylindrical designs All the patients had a Paprosky grade IIIA or greater femoral defect...
December 21, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28116264/failure-of-polyethelene-insert-locking-mechanism-after-a-posterior-stabilised-total-knee-arthroplasty-a-case-report
#19
Gurava Reddy Ay, Soundar Rajan D, Chiranjeevi T, Karthik C, Krishna Kiran E
INTRODUCTION: Disengagement of polyethylene insert used in total knee arthroplasty is a rare but serious complication. Still rarer is disengagement because of failure of tibial insert locking mechanism. We report a previously unpublished complication of polyethylene insert locking mechanism failure in a 10-months-old posterior stabilized total knee arthroplasty in a 70-year-old woman with osteoarthritis for whom Attune (Depuy) knee implant was used. CASE PRESENTATION: A 70-year-old female underwent (Attune, Depuy) primary bilateral posterior stabilised total knee arthroplasty in a private hospital...
July 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28110243/a-biomechanical-testing-system-to-determine-micromotion-between-hip-implant-and-femur-accounting-for-deformation-of-the-hip-implant-assessment-of-the-influence-of-rigid-body-assumptions-on-micromotions-measurements
#20
Steven Leuridan, Quentin Goossens, Jorg Roosen, Leonard Pastrav, Kathleen Denis, Michiel Mulier, Wim Desmet, Jos Vander Sloten
BACKGROUND: Accurate pre-clinical evaluation of the initial stability of new cementless hip stems using in vitro micromotion measurements is an important step in the design process to assess the new stem's potential. Several measuring systems, linear variable displacement transducer-based and other, require assuming bone or implant to be rigid to obtain micromotion values or to calculate derived quantities such as relative implant tilting. METHODS: An alternative linear variable displacement transducer-based measuring system not requiring a rigid body assumption was developed in this study...
January 16, 2017: Clinical Biomechanics
keyword
keyword
89119
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"