@inproceedings{KornaropoulosTaylorDudaetal.2009, author = {Kornaropoulos, Evgenios I. and Taylor, William R. and Duda, Georg and Ehrig, Rainald and Matziolis, Georg and M{\"u}ller, Michael and Wassilew, Georgi and Asbach, Patrick and Perka, Carsten and Heller, Markus O.}, title = {An imageless method to quantify the mechanical femoral-tibial angle based on the functional determination of joint centers and axes}, booktitle = {Annual meeting of the ESMAC 2009}, address = {London}, year = {2009}, language = {en} } @article{KornaropoulosTaylorDudaetal.2010, author = {Kornaropoulos, Evgenios I. and Taylor, William R. and Duda, Georg and Ehrig, Rainald and Matziolis, Georg and M{\"u}ller, Michael and Wassilew, Georgi and Asbach, Patrick and Perka, Carsten and Heller, Markus O.}, title = {Frontal plane alignment: An imageless method to predict the mechanical femoral-tibial angle (mFTA) based on functional determination of joint centres and axes}, volume = {31}, journal = {Gait \& Posture}, number = {2}, doi = {10.1016/j.gaitpost.2009.10.006}, pages = {204 -- 208}, year = {2010}, language = {en} } @article{DeppeGabrieleMazzolenietal.2025, author = {Deppe, Dominik and Gabriele, Matteo and Mazzoleni, Manuel Giovanni and Ordas-Bayon, Alejandro and Fidanza, Andrea and Rozhko, Yuriy and Şim{\c{s}}ek, Ekin Kaya and Keltz, Eran and Osterhoff, Georg and Damm, Philipp and Duda, Georg N. and Leskovar, Marko and Zachow, Stefan and Trepczynski, Adam and Heyland, Mark}, title = {Interobserver Reliability of the Modified Radiographic Union Score (mRUST) for Tibial and Femoral Fractures}, volume = {39}, journal = {Journal of Orthopaedic Trauma}, number = {10}, issn = {0890-5339}, doi = {10.1097/BOT.0000000000003032}, pages = {557 -- 563}, year = {2025}, abstract = {OBJECTIVES: To evaluate the reliability of the modified Radiographic Union Score for Tibial fractures (mRUST) as a reliable tool for monitoring lower limb fractures (femur, tibia) treated with various modalities (nail, plate). METHODS: Design: Retrospective analysis. Setting: Single center academic hospital in Germany. Patient Selection Criteria: Adult patients (≥18 years) with extra-articular long bone fractures of the lower extremities treated surgically between January 2005 and April 2022, requiring radiographs in two perpendicular planes and at least one follow-up visit, were included. Exclusion criteria were critical clinical conditions, inability to consent, joint articulation fractures, inadequate documentation, or insufficient imaging quality. Outcome Measures and Comparisons: Six international investigators (five orthopedic surgeons, one radiologist) independently assessed fracture line and callus growth per cortex (mRUST) at individualized follow-up time points based on clinical practice. To evaluate interrater reliability, intraclass correlation coefficients were calculated for the overall dataset, and for subsets of rated images, that were defined based on anatomical location (femur/tibia), treatment type (plate/nail fixation), and treatment combinations across locations. RESULTS: A total of 166 patients (63 femur fractures, 103 tibia fractures; 32.5\% female, mean age 43.4 (18-84)) with 1136 follow-up time points were analyzed. Overall interrater reliability for mRUST was good (intraclass correlation coefficient 0.77), consistent across fixation methods (nail/plate fixation, 0.79) and anatomical locations (tibia, 0.78; femur, 0.81). Cortex-specific reliability varied, with highest agreement for the medial cortex (0.70-0.74) and lowest for the posterior cortex (0.65-0.74). CONCLUSIONS: The mRUST (radiographic score) demonstrated reliability for monitoring fracture healing in the femur and tibia, irrespective of fixation method, supporting its use as a generalizable tool across lower limb fractures. LEVEL OF EVIDENCE: Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.}, language = {en} } @article{HellerDudaEhrigetal.2005, author = {Heller, Markus O. and Duda, Georg and Ehrig, Rainald and Schell, H. and Seebeck, P. and Taylor, William R.}, title = {Muskuloskeletale Belastungen im Schafshinterlauf}, journal = {Materialwissenschaft und Werkstofftechnik}, number = {36}, pages = {775 -- 780}, year = {2005}, language = {en} } @article{HellerKratzensteinEhrigetal.2011, author = {Heller, Markus O. and Kratzenstein, Stefan and Ehrig, Rainald and Wassilew, Georgi and Duda, Georg and Taylor, William R.}, title = {The weighted optimal common shape technique improves identification of the hip joint centre of rotation in vivo}, volume = {29}, journal = {Journal of Orthopedic Research}, pages = {1470 -- 5}, year = {2011}, language = {en} } @article{EhrigHellerKratzensteinetal.2011, author = {Ehrig, Rainald and Heller, Markus O. and Kratzenstein, Stefan and Duda, Georg and Trepczynski, Adam and Taylor, William R.}, title = {The SCoRE residual: A quality index to assess the accuracy of joint estimations}, volume = {44}, journal = {Journal of Biomechanics}, number = {7}, doi = {10.1016/j.jbiomech.2010.12.009}, pages = {1400 -- 1404}, year = {2011}, language = {en} } @article{EhrigTaylorDudaetal.2007, author = {Ehrig, Rainald and Taylor, William R. and Duda, Georg and Heller, Markus O.}, title = {A Survey for Formal Methods for Determining Functional Joint Axes}, journal = {Journal of Biomechanics}, pages = {2150 -- 2157}, year = {2007}, language = {en} } @inproceedings{KratzensteinEhrigHelleretal.2010, author = {Kratzenstein, Stefan and Ehrig, Rainald and Heller, Markus O. and Duda, Georg and Taylor, William R.}, title = {A Quantification of Accuracy in Estimating Joint Centers}, booktitle = {17th Congress of the European Society of Biomechanics}, address = {Edinburgh}, year = {2010}, language = {en} } @inproceedings{KratzensteinHellerEhrigetal.2009, author = {Kratzenstein, Stefan and Heller, Markus O. and Ehrig, Rainald and Duda, Georg and Schr{\"o}der, J{\"o}rg H. and Taylor, William R.}, title = {Die Bestimmung der Genauigkeit nicht-invasiver Techniken zur Ermittlung der H{\"u}ftgelenksposition in-vivo}, booktitle = {6th annual meeting of the German Society for Biomechanics (DGfB)}, address = {M{\"u}nster}, year = {2009}, language = {en} } @inproceedings{KratzensteinHellerEhrigetal.2009, author = {Kratzenstein, Stefan and Heller, Markus O. and Ehrig, Rainald and Duda, Georg and Schr{\"o}der, J{\"o}rg H. and Taylor, William R.}, title = {Der Vergleich von nicht-invasiven Techniken zur Bestimmung der H{\"u}ftgelenksposition}, booktitle = {Annual meeting of the German Society of Orthopaedics and Trauma Surgery}, address = {Berlin}, year = {2009}, language = {en} } @inproceedings{KratzensteinHellerEhrigetal.2010, author = {Kratzenstein, Stefan and Heller, Markus O. and Ehrig, Rainald and Duda, Georg and Taylor, William R.}, title = {The Residual: A Reliable Measure of Accuracy in the Determination of Joint Centers}, booktitle = {Transactions Vol. 35, 2010 Annual Meeting of the Orthopedic Society}, address = {New Orleans}, year = {2010}, language = {en} } @inproceedings{KratzensteinHellerEhrigetal.2010, author = {Kratzenstein, Stefan and Heller, Markus O. and Ehrig, Rainald and Duda, Georg and Taylor, William R.}, title = {The Hip Joint Centre can be determined to within 3 mm}, booktitle = {17th Congress of the European Society of Biomechanics}, address = {Edinburgh}, year = {2010}, language = {en} } @inproceedings{KratzensteinHellerEhrigetal.2010, author = {Kratzenstein, Stefan and Heller, Markus O. and Ehrig, Rainald and Wassilew, Georgi and Duda, Georg and Taylor, William R.}, title = {A new approach for optimally reducing skin marker artifact allows determination of the hip joint center within 3mm}, booktitle = {Transactions Vol. 35, 2010 Annual Meeting of the Orthopedic Society}, address = {New Orleans}, year = {2010}, language = {en} } @article{TaylorPoepplauKoenigetal.2011, author = {Taylor, William R. and P{\"o}pplau, Berry M. and K{\"o}nig, Christian and Ehrig, Rainald and Zachow, Stefan and Duda, Georg and Heller, Markus O.}, title = {The medial-lateral force distribution in the ovine stifle joint during walking}, volume = {29}, journal = {Journal of Orthopaedic Research}, number = {4}, doi = {10.1002/jor.21254}, pages = {567 -- 571}, year = {2011}, language = {en} } @article{BoethDudaHelleretal.2013, author = {Boeth, Heide and Duda, Georg and Heller, Markus O. and Ehrig, Rainald and Doyscher, Ralf and Jung, Tobias and Moewis, Philippe and Scheffler, Sven and Taylor, William R.}, title = {Anterior cruciate ligament-deficient patients with passive knee joint laxity have a decreased range of anterior-posterior motion during active movements}, volume = {41}, journal = {The American Journal of Sports Medicine}, number = {5}, doi = {10.1177/0363546513480465}, pages = {1051 -- 7}, year = {2013}, language = {en} } @inproceedings{TaylorKornaropoulosEhrigetal.2009, author = {Taylor, William R. and Kornaropoulos, Evgenios I. and Ehrig, Rainald and Heller, Markus O. and Duda, Georg}, title = {Reproducibility of a functional approach to gait analysis}, booktitle = {Annual meeting of the ESMAC 2009}, address = {London}, year = {2009}, language = {en} } @inproceedings{TaylorFroehlichButtgereitetal.2012, author = {Taylor, William R. and Fr{\"o}hlich, Annika and Buttgereit, Frank and Ehrig, Rainald and Witaschek, Tom and Duda, Georg}, title = {Metacarpophalangeal joint stiffness is reduced in patients affected by rheumatoid arthritis after glucocorticoid medication}, booktitle = {Proceedings of the ESM-2012, Aalborg}, editor = {Kersting, Uwe and Morlock, Michael and Jirova-Enzmann, Daniela and Dremstrup, Kim}, publisher = {Department of Health Science and Technology, Aalborg University}, pages = {39}, year = {2012}, language = {en} } @inproceedings{KornaropoulosTaylorDudaetal.2009, author = {Kornaropoulos, Evgenios I. and Taylor, William R. and Duda, Georg and Ehrig, Rainald and Heller, Markus O.}, title = {Frontal plane lower limb alignment using functionally determined joint centers and axes}, booktitle = {International Conference on Computational Bioengineering}, year = {2009}, language = {en} } @inproceedings{KornaropoulosTaylorDudaetal.2009, author = {Kornaropoulos, Evgenios I. and Taylor, William R. and Duda, Georg and Ehrig, Rainald and Heller, Markus O.}, title = {An imageless method to quantify the Mechanical Femoral-Tibial Angle (MFTA) using functionally defined joint centers and axes.}, booktitle = {6th Annual meeting of the German Society for Biomechanics (DGfB)}, year = {2009}, language = {en} } @inproceedings{KraemerMaggioniTycowiczetal.2018, author = {Kr{\"a}mer, Martin and Maggioni, Marta and Tycowicz, Christoph von and Brisson, Nick and Zachow, Stefan and Duda, Georg and Reichenbach, J{\"u}rgen}, title = {Ultra-short echo-time (UTE) imaging of the knee with curved surface reconstruction-based extraction of the patellar tendon}, booktitle = {ISMRM (International Society for Magnetic Resonance in Medicine), 26th Annual Meeting 2018, Paris, France}, year = {2018}, abstract = {Due to very short T2 relaxation times, imaging of tendons is typically performed using ultra-short echo-time (UTE) acquisition techniques. In this work, we combined an echo-train shifted multi-echo 3D UTE imaging sequence with a 3D curved surface reconstruction to virtually extract the patellar tendon from an acquired 3D UTE dataset. Based on the analysis of the acquired multi-echo data, a T2* relaxation time parameter map was calculated and interpolated to the curved surface of the patellar tendon.}, language = {en} } @article{AlvesEhrigRaffaltetal.2020, author = {Alves, S{\´o}nia and Ehrig, Rainald and Raffalt, Peter C. and Bender, Alwina and Duda, Georg and Agres, Alison N.}, title = {Quantifying Asymmetry in Gait: A Weighted Universal Symmetry Index to Evaluate 3D Ground Reaction Forces}, journal = {Frontiers in Bioengineering and Biotechnology}, year = {2020}, abstract = {Though gait asymmetry is used as a metric of functional recovery in clinical rehabilitation, there is no consensus on an ideal method for its evaluation. Various methods have been proposed but are limited in scope, as they can often use only positive signals or discrete values extracted from time-scale data as input. By defining five symmetry axioms, a framework for benchmarking existing methods was established and a new method was described here for the first time: the weighted universal symmetry index (wUSI), which overcomes limitations of other methods. Both existing methods and the wUSI were mathematically compared to each other and in respect to their ability to fulfill the proposed symmetry axioms. Eligible methods that fulfilled these axioms were then applied using both discrete and continuous approaches to ground reaction force (GRF) data collected from healthy gait, both with and without artificially induced asymmetry using a single instrumented elbow crutch. The wUSI with a continuous approach was the only symmetry method capable of determining GRF asymmetries in different walking conditions in all three planes of motion. When used with a continuous approach, the wUSI method was able to detect asymmetries while avoiding artificial inflation, a common problem reported in other methods. In conclusion, the wUSI is proposed as a universal method to quantify three-dimensional GRF asymmetries, which may also be expanded to other biomechanical signals.}, language = {en} }