Guidelines for standardization of radiostereometry (RSA) of implants
TLDR
6 research centers have agreed upon standards for terminology, description and use of RSA arrangement including radiographic set-up and techniques, which will form the basis of a detailed standardization protocol under supervision of ISO and the European Standards Working Group on Joint Replacement Implants.Abstract:
There is a need for standardization of radiostereometric (RSA) investigations to facilitate comparison of outcome reported from different research groups. In this document, 6 research centers have ...read more
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Additively manufactured porous tantalum implants
Ruben Wauthle,Johan van der Stok,Saber Amin Yavari,Jan Van Humbeeck,Jean-Pierre Kruth,Amir A. Zadpoor,Harrie Weinans,Michiel Mulier,Jan Schrooten +8 more
TL;DR: Laser-melted tantalum shows excellent osteoconductive properties, has a higher normalized fatigue strength and allows for more plastic deformation due to its high ductility, and is a first step towards a new generation of open porous tantalum implants manufactured using selective laser melting.
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Early migration of tibial components is associated with late revision: A systematic review and meta-analysis of 21,000 knee arthroplasties
Bart G Pijls,Edward R. Valstar,Klaas-Auke Nouta,Josepha W.M. Plevier,Marta Fiocco,Saskia Middeldorp,Rob G H H Nelissen +6 more
TL;DR: The proposed migration thresholds can be implemented in a phased, evidence-based introduction of new types of knee prostheses, since they allow early detection of high-risk TKPs while exposing only a small number of patients.
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2D–3D shape reconstruction of the distal femur from stereo X-ray imaging using statistical shape models
Nora Baka,Bart L. Kaptein,M. de Bruijne,M. de Bruijne,T. van Walsum,J. E. Giphart,Wiro J. Niessen,Wiro J. Niessen,Boudewijn P. F. Lelieveldt,Boudewijn P. F. Lelieveldt +9 more
TL;DR: A method for pose estimation and shape reconstruction of 3D bone surfaces from two (or more) calibrated X-ray images using a statistical shape model (SSM) and automatic edge selection on a Canny edge map is proposed.
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Low BMD affects initial stability and delays stem osseointegration in cementless total hip arthroplasty in women: A 2-year RSA study of 39 patients
TL;DR: Low BMD, changes in intraosseous dimensions of the proximal femur, and ageing adversely affected initial stability and delayed osseointegration of cementless stems in women.
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The history and future of radiostereometric analysis.
TL;DR: Improvements in the technical accuracy and type of kinematic analyses possible have been relatively modest, but radiostereometric analysis is now easier and less time consuming to use, with a resolution in clinical practice almost equal to what could only previously be obtained under ideal laboratory conditions.
References
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Roentgen stereophotogrammetry. A method for the study of the kinematics of the skeletal system.
TL;DR: A roentgen stereophotogrammetric method for determination of positions of radiopaque markers in an object and how the degrees of freedom of the plate with control points, which are difficult to control at construction of the test cages, can be determined by specific calibration procedures is described.
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Determining the movements of the skeleton using well-configured markers
Inge Söderkvist,Per-Åke Wedin +1 more
TL;DR: The problem of determining skeletal movements in three dimensions by using a number of landmarks by using the positions of the landmarks in least-squares sense is treated and a condition number is presented for the problem with good geometrical properties.
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Does early micromotion of femoral stem prostheses matter? 4-7-year stereoradiographic follow-up of 84 cemented prostheses
TL;DR: Roentgen stereophotogrammetry was used to measure the migration of the centre of the femoral head in 84 cemented Lubinus SP I hip arthroplasties and found these implants showed greater subsidence, medial migration and posterior migration during the first two postoperative years than did the hips which had not been revised.
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Roentgen stereophotogrammetric analysis as a predictor of mechanical loosening of knee prostheses
Leif Ryd,Björn E.J. Albrektsson,Lars Carlsson,F. Dansgard,P. Herberts,Anders Lindstrand,L. Regner,Sören Toksvig-Larsen +7 more
TL;DR: Findings suggest that mechanical loosening begins early in the postoperative period, seen at this stage in 20% of abnormally migrating tibial components, may not appear until up to ten years after the operation.
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Radiostereometry of hip prostheses. Review of methodology and clinical results.
TL;DR: Measurements of implant micromovement during 1 to 2 years after surgery have proved to be of value to predict later clinical failure because of aseptic loosening and revision.