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Radiostereometry

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https://www.readbyqxmd.com/read/27886360/high-proximal-migration-in-cemented-acetabular-revisions-operated-with-bone-impaction-grafting-47-revision-cups-followed-with-rsa-for-17-years
#1
Maziar Mohaddes, Peter Herberts, Henrik Malchau, Per-Erik Johanson, Johan Kärrholm
BACKGROUND: Bone impaction grafting is a biologically and mechanically appealing option in acetabular revision surgery, allowing restitution of the bone stock and restoration of the biomechanics. We analysed differences in proximal migration of the revision acetabular components when bone impaction grafting is used together with a cemented or an uncemented cup. PATIENTS AND METHODS: 43 patients (47 hips), revised due to acetabular loosening and judged to have less than 50% host bone-implant contact were included...
November 22, 2016: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/27478832/accuracy-and-precision-of-three-dimensional-low-dose-ct-compared-to-standard-rsa-in-acetabular-cups-an-experimental-study
#2
Cyrus Brodén, Henrik Olivecrona, Gerald Q Maguire, Marilyn E Noz, Michael P Zeleznik, Olof Sköldenberg
Background and Purpose. The gold standard for detection of implant wear and migration is currently radiostereometry (RSA). The purpose of this study is to compare a three-dimensional computed tomography technique (3D CT) to standard RSA as an alternative technique for measuring migration of acetabular cups in total hip arthroplasty. Materials and Methods. With tantalum beads, we marked one cemented and one uncemented cup and mounted these on a similarly marked pelvic model. A comparison was made between 3D CT and standard RSA for measuring migration...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27388352/migration-and-head-penetration-of-vitamin-e-diffused-cemented-polyethylene-cup-compared-to-standard-cemented-cup-in-total-hip-arthroplasty-study-protocol-for-a-randomised-double-blind-controlled-trial-e1-hip
#3
Olof Sköldenberg, Agata Rysinska, Ghazi Chammout, Mats Salemyr, Olle Muren, Henrik Bodén, Thomas Eisler
INTRODUCTION: In vitro, Vitamin-E-diffused, highly cross-linked polyethylene (PE) has been shown to have superior wear resistance and improved mechanical properties when compared to those of standard highly cross-linked PE liners used in total hip arthroplasty (THA). The aim of the study is to evaluate the safety of a new cemented acetabular cup with Vitamin-E-doped PE regarding migration, head penetration and clinical results. METHODS AND ANALYSIS: In this single-centre, double-blinded, randomised controlled trial, we will include 50 patients with primary hip osteoarthritis scheduled for THA and randomise them in a 1:1 ratio to a cemented cup with either argon gas-sterilised PE (control group) or Vitamin-E-diffused PE (vitamin-e group)...
2016: BMJ Open
https://www.readbyqxmd.com/read/27339484/can-implant-removal-restore-mobility-after-fracture-of-the-thoracolumbar-segment
#4
Paul Axelsson, Björn Strömqvist
Background and purpose - Randomized trials have found that treating spinal burst fractures with reduction and posterior fixation is adequate without the use of bone grafting for definitive fusion. Restitution of intervertebral mobility of such an unfused segment after fracture healing may unload the adjacent parts of the spine and reduce the risk of degeneration of these segments. We used radiostereometry (RSA) to study whether late implant removal would restore the intervertebral mobility of a thoracolumbar segment treated with posterior instrumentation but no bone grafting for unstable spinal fracture...
October 2016: Acta Orthopaedica
https://www.readbyqxmd.com/read/27188836/early-subsidence-predicts-failure-of-a-cemented-femoral-stem-with-minor-design-changes
#5
Per-Erik Johanson, Martin Antonsson, Bita Shareghi, Johan Kärrholm
BACKGROUND: Radiostereometry (RSA) measurements of early micromotion can predict later failure in hip and knee prostheses. In hip implants, RSA has been particularly helpful in the evaluation of composite-beam stem designs. The Spectron EF Primary stem (Smith & Nephew, London, UK) has shown inferior performance compared with its predecessors in both clinical studies and registry reports. Early RSA studies have shown somewhat greater subsidence for the Spectron EF Primary stem compared with the earlier Spectron EF, but still within boundaries considered to be safe...
October 2016: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/26364953/no-medium-term-advantage-of-electrochemical-deposition-of-hydroxyapatite-in-cementless-femoral-stems-5-year-rsa-and-dxa-results-from-a-randomized-controlled-trial
#6
RANDOMIZED CONTROLLED TRIAL
Bernhard Flatøy, Stephan M Röhrl, Berte Bøe, Lars Nordsletten
BACKGROUND AND PURPOSE: Hydroxyapatite has been used for a long time as an adjunct to enhance cementless fixation. The benefit of this is still debated, but new methods of hydroxyapatite deposition have emerged, offering possible gains. In order to investigate this further, we compared the migration pattern and periprosthetic bone remodeling in a cementless femoral stem with either electrochemically deposited hydroxyapatite-called Bonemaster (BM)-or a conventional plasma-sprayed hydroxyapatite (HA) coating...
February 2016: Acta Orthopaedica
https://www.readbyqxmd.com/read/26212694/innate-immune-response-and-implant-loosening-interferon-gamma-is-inversely-associated-with-early-migration-of-total-knee-prostheses
#7
Monique A E Schoeman, Bart G Pijls, Angela E Oostlander, Johan C Keurentjes, Edward R Valstar, Rob G H H Nelissen, Ingrid Meulenbelt
To allow prediction of the risk of loosening prior to surgery, we investigated the relationship between innate immune cytokine response via TLR2 stimulation and early migration of six different knee prostheses using RSA (radiostereometry). This study included 114 patients of a prospective RSA-cohort who received a total knee arthroplasty. Whole blood cytokine responses were obtained by ex vivo stimulation with tripalmitoyl-S-glycerylcysteine (Pam3Cys-SK4) for assessment of the TLR2 immune response. Early migration was calculated using the maximum total point motion (MTPM) 1 year post surgery...
January 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/25952922/low-wear-high-stability-promises-of-success-in-a-moderately-cross-linked-cup
#8
Bernhard Flatøy, Jonas Rydinge, Jon Dahl, Stephan M Röhrl, Lars Nordsletten
PURPOSE: Cross-linking has proven effective in reducing polyethylene wear in total hip replacements. However, increasing the amount of cross-links will impair other mechanical properties of the polyethylene. The optimal threshold of crosslinking has still not been established. This led to the development of a moderately cross-linked (5 Mrad) cemented cup in which wear and stability is yet to be determined. METHODS: A total of, 70 hips were included in this case series on the cemented Marathon® cup...
May 2015: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/25633755/e-vitamin-infused-highly-cross-linked-polyethylene-rsa-results-from-a-randomised-controlled-trial-using-32-mm-and-36-mm-ceramic-heads
#9
RANDOMIZED CONTROLLED TRIAL
Einar Lindalen, Lars Nordsletten, Øystein Høvik, Stephan M Röhrl
BACKGROUND: Polyethylene wear has been a major cause of revision of cementless total hip replacements. Highly cross-linked polyethylene has been developed to increase mechanical resistance to wear. However, cross-linking from irradiation of the polyethylene generates free radicals and these can oxidise in vivo and might over time alter the initial mechanical properties. Vitamin-E infused highly cross-linked polyethylene has been developed to reduce the amount of free radicals without compromising the mechanical properties...
January 2015: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/25631687/vitamin-e-diffused-highly-cross-linked-polyethylene-liner-compared-to-standard-liners-in-total-hip-arthroplasty-a-randomized-controlled-trial
#10
RANDOMIZED CONTROLLED TRIAL
Mats Salemyr, Olle Muren, Torbjörn Ahl, Henrik Bodén, Ghazi Chammout, André Stark, Olof Sköldenberg
PURPOSE: We hypothesized that a vitamin E-treated polyethylene articulating liner had lower femoral head penetration than a conventional liner. METHODS: Fifty-one patients with primary hip osteoarthritis were randomized to an uncemented cup with either vitamin E-treated highly cross-linked polyethylene (HXLPE) (vitamin-e group, n = 25) or a standard HXLPE liner (control group, n = 26) and followed for two years after surgery. The outcome variable was polyethylene (PE) linear head penetration, measured with radiostereometry (RSA)...
August 2015: International Orthopaedics
https://www.readbyqxmd.com/read/25338110/porous-titanium-construct-cup-compared-to-porous-coated-titanium-cup-in-total-hip-arthroplasty-a-randomised-controlled-trial
#11
RANDOMIZED CONTROLLED TRIAL
Mats Salemyr, Olle Muren, Thomas Eisler, Henrik Bodén, Ghazi Chammout, André Stark, Olof Sköldenberg
PURPOSE: The purpose of this study was to determine if a new titanium cup with increased porosity resulted in different periacetabular bone loss and migration compared to a porous coated cup. METHODS: Fifty-one patients with primary hip osteoarthritis were randomized to either a cup with porous titanium construct backside (porous titanium group, n = 25) or a conventional porous coated titanium cup (control group, n = 26). The primary outcome variable was change in periacetabular bone mineral density two years after surgery measured with dual energy X-ray absorptiometry (DXA)...
May 2015: International Orthopaedics
https://www.readbyqxmd.com/read/25220196/evaluation-of-periprosthetic-bone-mineral-density-and-postoperative-migration-of-humeral-head-resurfacing-implants-two-year-results-of-a-randomized-controlled-clinical-trial
#12
RANDOMIZED CONTROLLED TRIAL
Inger Mechlenburg, Thomas M Klebe, Kaj V Døssing, Anders Amstrup, Kjeld Søballe, Maiken Stilling
BACKGROUND: Implant migration, bone mineral density (BMD), length of glenohumeral offset (LGHO), and clinical results were compared for the Copeland (Biomet Inc, Warsaw, IN, USA) and the Global C.A.P. (DePuy Int, Warsaw, IN, USA) humeral head resurfacing implants (HHRIs). METHODS: The study randomly allocated 32 patients (13 women), mean age 63 years (range, 39-82 years), with shoulder osteoarthritis to a Copeland (n = 14) or Global C.A.P. (n = 18) HHRI. Patients were monitored for 2 years with radiostereometry, dual-energy X-ray absorptiometry, Constant Shoulder Score (CSS), and the Western Ontario Osteoarthritis of the Shoulder Index (WOOS)...
October 2014: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/25175668/design-modifications-of-the-uncemented-furlong-hip-stem-result-in-minor-early-subsidence-but-do-not-affect-further-stability-a-randomized-controlled-rsa-study-with-5-year-follow-up
#13
RANDOMIZED CONTROLLED TRIAL
Erik Weber, Martin Sundberg, Gunnar Flivik
BACKGROUND AND PURPOSE: Even small design modifications of uncemented hip stems may alter the postoperative 3-D migration pattern. The Furlong Active is an uncemented femoral stem which, in terms of design, is based on its precursor-the well-proven Furlong HAC-but has undergone several design changes. The collar has been removed on the Active stem along with the lateral fin; it is shorter and has more rounded edges in the proximal part. We compared the migration patterns of the uncemented Furlong HAC stem and the modified Furlong Active stem in a randomized, controlled trial over 5 years using radiostereometry (RSA)...
December 2014: Acta Orthopaedica
https://www.readbyqxmd.com/read/24972998/tibial-component-alignment-and-risk-of-loosening-in-unicompartmental-knee-arthroplasty-a-radiographic-and-radiostereometric-study
#14
P Barbadoro, A Ensini, A Leardini, M d'Amato, A Feliciangeli, A Timoncini, F Amadei, C Belvedere, S Giannini
PURPOSE: Unicompartmental knee arthroplasty (UKA) has shown a higher rate of revision compared with total knee arthroplasty. The success of UKA depends on prosthesis component alignment, fixation and soft tissue integrity. The tibial cut is the crucial surgical step. The hypothesis of the present study is that tibial component malalignment is correlated with its risk of loosening in UKA. METHODS: This study was performed in twenty-three patients undergoing primary cemented unicompartmental knee arthroplasties...
December 2014: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/24954490/good-stability-but-high-periprosthetic-bone-mineral-loss-and-late-occurring-periprosthetic-fractures-with-use-of-uncemented-tapered-femoral-stems-in-patients-with-a-femoral-neck-fracture
#15
Olof G Sköldenberg, Helene Sjöö, Paula Kelly-Pettersson, Henrik Bodén, Thomas Eisler, André Stark, Olle Muren
BACKGROUND AND PURPOSE: We previously evaluated a new uncemented femoral stem designed for elderly patients with a femoral neck fracture and found stable implant fixation and good clinical results up to 2 years postoperatively, despite substantial periprosthetic bone mineral loss. We now present the medium-term follow-up results from this study. PATIENTS AND METHODS: In this observational prospective cohort study, we included 50 patients (mean age 81 (70-92) years) with a femoral neck fracture...
August 2014: Acta Orthopaedica
https://www.readbyqxmd.com/read/24954489/adherence-of-hip-and-knee-arthroplasty-studies-to-rsa-standardization-guidelines-a-systematic-review
#16
REVIEW
Rami Madanat, Tatu J Mäkinen, Hannu T Aro, Charles Bragdon, Henrik Malchau
BACKGROUND AND PURPOSE: Guidelines for standardization of radiostereometry (RSA) of implants were published in 2005 to facilitate comparison of outcomes between various research groups. In this systematic review, we determined how well studies have adhered to these guidelines. METHODS: We carried out a literature search to identify all articles published between January 2000 and December 2011 that used RSA in the evaluation of hip or knee prosthesis migration. 2 investigators independently evaluated each of the studies for adherence to the 13 individual guideline items...
September 2014: Acta Orthopaedica
https://www.readbyqxmd.com/read/24500826/bone-loss-around-a-stable-partly-threaded-hydroxyapatite-coated-cup-a-prospective-cohort-study-using-rsa-and-dxa
#17
Stergios Lazarinis, Jan Milbrink, Per Mattsson, Hans Mallmin, Nils P Hailer
STUDY PURPOSE: Aseptic loosening of the acetabular component is the most common reason for revision after primary THA, and periprosthetic demineralisation has been described as a potential cause for this process. The trabeculae-oriented pattern (TOP)-cup is a flat, hydroxyapatite (HA)-coated titanium shell with a threaded rim that was developed in order to minimise periprosthetic bone loss. We hypothesised that this cup provides good primary stability and improves preservation of periprosthetic bone mineral density (BMD)...
March 2014: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/24286562/measurement-of-the-migration-of-a-focal-knee-resurfacing-implant-with-radiostereometry
#18
Olof Sköldenberg, Thomas Eisler, André Stark, Olle Muren, Nicolas Martinez-Carranza, Leif Ryd
BACKGROUND AND PURPOSE: Articular resurfacing metal implants have been developed to treat full-thickness localized articular cartilage defects. Evaluation of the fixation of these devices is mandatory. Standard radiostereometry (RSA) is a validated method for evaluation of prosthetic migration, but it requires that tantalum beads are inserted into the implant. For technical reasons, this is not possible for focal articular resurfacing components. In this study, we therefore modified the tip of an articular knee implant and used it as a marker for RSA, and then validated the method...
February 2014: Acta Orthopaedica
https://www.readbyqxmd.com/read/24162760/healing-of-human-achilles-tendon-ruptures-radiodensity-reflects-mechanical-properties
#19
Thorsten Schepull, Per Aspenberg
PURPOSE: This study tests the idea of using radiodensity from computed tomography to quantitatively evaluate the healing of ruptured Achilles tendons. METHODS: The radiodensity of the healing tendons in sixty-five patients who were treated for Achilles tendon rupture was measured. The hypothesis was that density would correlate with an estimate for e-modulus, derived from strain, measured by radiostereometry with different mechanical loadings. RESULTS: Radiodensity 7 weeks after injury was decreased to 67 % (SD 11) of the contralateral, uninjured tendon...
March 2015: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/23795579/more-than-50-reduction-of-wear-in-polyethylene-liners-with-alumina-heads-compared-to-cobalt-chrome-heads-in-hip-replacements-a-10-year-follow-up-with-radiostereometry-in-43-hips
#20
RANDOMIZED CONTROLLED TRIAL
Jon Dahl, Finnur Snorrason, Lars Nordsletten, Stephan M Röhrl
BACKGROUND AND PURPOSE: Excessive wear of acetabular liners in hip replacements may lead to osteolysis and cup loosening. Different head materials are currently used. We measured differences in wear between alumina and cobalt-chrome heads with the same polyethylene liner. PATIENTS AND METHODS: 39 patients (43 hips) with osteoarthritis were included in a study with 10-year follow-up. Wear was measured as proximal and 3D penetration of the head in the liner with radiostereometry (RSA)...
August 2013: Acta Orthopaedica
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