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Tibia component rotation

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https://www.readbyqxmd.com/read/29128876/internal-femoral-component-malrotation-in-tka-significantly-alters-tibiofemoral-kinematics
#1
Thomas J Heyse, Bilal F El-Zayat, Ronny De Corte, Yan Chevalier, Susanne Fuchs-Winkelmann, Luc Labey
PURPOSE: Femoral component malrotation in total knee arthroplasty (TKA) is clinically proven to cause dissatisfaction and impaired function. This study is an attempt to characterize the tibiofemoral kinematics following femoral malrotation in posterior stabilized (PS) TKA. It was hypothesized that internal malrotation would introduce the most pronounced changes. METHODS: Six fresh-frozen cadaver specimens were mounted in a kinematic rig. Three motion patterns were applied with the native knee and following PS TKA (passive motion, open chain extension, and squatting) while infrared cameras recorded the trajectories of markers attached to femur and tibia...
November 11, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29050180/-meta-analysis-of-three-dimensional-printing-patient-specific-instrumentation-versus-conventional-instrumentation-in-total-knee-arthroplasty
#2
J T Ren, C Xu, J S Wang, X L Liu
Objective: To evaluate the effects of three-dimensional printing patient-specific instrumentation(PSI) versus conventional instrumentation(CI) in the total knee arthroplasty. Methods: According to "patient-specific" , "patient-matched" , "custom" , "Instrumentation" , "Guide Instrumentation" , "cutting blocks" , "total knee arthroplasty" , "total knee replacement" , "TKA" and "TKR" , the literature on PubMed, EMbase, Cochrane library, CBM and WanFang were searched. According to the inclusion and exclusion criteria, the high quality randomized control trial (RCT) studies about three-dimensional (3D) printing patient-specific instrumentation versus conventional instrumentation in the total knee arthroplasty were collected...
October 1, 2017: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
https://www.readbyqxmd.com/read/28929828/increased-risk-of-aseptic-loosening-for-43-525-rotating-platform-vs-fixed-bearing-total-knee-replacements
#3
MULTICENTER STUDY
Oystein Gothesen, Stein Hakon L Lygre, Michelle Lorimer, Stephen Graves, Ove Furnes
Background and purpose - Given similar functional outcomes with mobile and fixed bearings, a difference in survivorship may favor either. This study investigated the risk of aseptic loosening for the most used subtypes of mobile-bearing rotating-platform knees, in Norway and Australia. Patients and methods - Primary TKRs reported to the Norwegian and Australian joint registries, between 2003 and 2014, were analyzed with aseptic loosening as primary end-point and all revisions as secondary end-point. We hypothesized that no difference would be found in the rate of revision between rotating-platform and the most used fixed-bearing TKRs, or between keeled and non-keeled tibia...
December 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28925568/the-fibular-meniscus-of-the-kangaroo-as-an-adaptation-against-external-tibial-rotation-during-saltatorial-locomotion
#4
Adrian C Miller, Martin A Cake, Natalie M Warburton
The kangaroo knee is, as in other species, a complex diarthrodial joint dependent on interacting osseous, cartilaginous and ligamentous components for its stability. While principal load bearing occurs through the femorotibial articulation, additional lateral articulations involving the fibula and lateral fabella also contribute to the functional arrangement. Several fibrocartilage and ligamentous structures in this joint remain unexplained or have been misunderstood in previous studies. In this study, we review the existing literature on the structure of the kangaroo 'knee' before providing a new description of the gross anatomical and histological structures...
September 19, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28914139/the-influence-of-geometric-design-variables-on-the-kinematic-performance-of-a-surface-guided-total-knee-replacement
#5
Shabnam Pejhan, Eric Bohm, Jan-Mels Brandt, Urs Wyss
OBJECTIVE: Tibiofemoral geometries in a total knee replacement (TKR) affect the performance of an implant during activities of daily living. The specially shaped components of a surface-guided TKR aim to control the tibiofemoral motion, such that a normal pattern of motion is achieved, even at high flexion angles. The purpose of this study was to assess the influence of the design parameters on the kinematic behavior of such an implant. A combination of design variables was determined that resulted in the least deviation from the design kinematic target...
September 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28816345/errors-in-calculating-anterior-posterior-tibial-contact-locations-in-total-knee-arthroplasty-using-three-dimensional-model-to-two-dimensional-image-registration-in-radiographs-an-in-vitro-study-of-two-methods
#6
Derrick S Ross, Stephen M Howell, Maury L Hull
Knowledge of anterior-posterior (A-P) tibial contact locations provides an objective assessment of the relative motion of the tibia on the femur following total knee arthroplasty (TKA), which can be used to compare the effects of different components, surgical techniques, and alignment goals on knee function in vivo. Both the lowest point method and the penetration method have been used to calculate A-P tibial contact locations using three-dimensional (3D) model to two-dimensional (2D) image registration. The primary objective of this study was to quantify errors in calculating the A-P tibial contact location using the lowest point and penetration methods because the errors in calculating the A-P tibial contact locations using these two methods are unknown...
December 1, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28630761/partial-proximal-tibia-fractures
#7
Michael J Raschke, Christoph Kittl, Christoph Domnick
Partial tibial plateau fractures may occur as a consequence of either valgus or varus trauma combined with a rotational and axial compression component.High-energy trauma may result in a more complex and multi-fragmented fracture pattern, which occurs predominantly in young people. Conversely, a low-energy mechanism may lead to a pure depression fracture in the older population with weaker bone density.Pre-operative classification of these fractures, by Müller AO, Schatzker or novel CT-based methods, helps to understand the fracture pattern and choose the surgical approach and treatment strategy in accordance with estimated bone mineral density and the individual history of each patient...
May 2017: EFORT open reviews
https://www.readbyqxmd.com/read/28600241/automated-quantitative-bone-analysis-in-in-vivo-x-ray-micro-computed-tomography
#8
Ali Behrooz, Peet Kask, Jeff Meganck, Joshua Kempner
Measurement and analysis of bone morphometry in 3D micro-computed tomography volumes using automated image processing and analysis improve the accuracy, consistency, reproducibility, and speed of preclinical osteological research studies. Automating segmentation and separation of individual bones in 3D micro-computed tomography volumes of murine models presents significant challenges considering partial volume effects and joints with thin spacing, i.e., 50 to [Formula: see text]. In this paper, novel hybrid splitting filters are presented to overcome the challenge of automated bone separation...
September 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28571921/variability-in-static-alignment-and-kinematics-for-kinematically-aligned-tka
#9
Willy Theodore, Joshua Twiggs, Elizabeth Kolos, Justin Roe, Brett Fritsch, David Dickison, David Liu, Lucy Salmon, Brad Miles, Stephen Howell
BACKGROUND: Total knee arthroplasty (TKA) significantly improves pain and restores a considerable degree of function. However, improvements are needed to increase patient satisfaction and restore kinematics to allow more physically demanding activities that active patients consider important. The aim of our study was to compare the alignment and motion of kinematically and mechanically aligned TKAs. METHODS: A patient specific musculoskeletal computer simulation was used to compare the tibio-femoral and patello-femoral kinematics between mechanically aligned and kinematically aligned TKA in 20 patients...
May 29, 2017: Knee
https://www.readbyqxmd.com/read/28559197/anteroposterior-rotational-references-of-the-tibia-for-medial-unicompartmental-knee-arthroplasty-in-japanese-patients
#10
Ichiro Tsukamoto, Masao Akagi, Shigeshi Mori, Shinji Inoue, Shigeki Asada, Fuminori Matsumura
BACKGROUND: In unicompartmental knee arthroplasty (UKA), there is no consensus regarding how to determine the anteroposterior (AP) reference of the tibia. A number of surgeons in Japan perform the sagittal saw cut using the medial intercondylar ridge (MIR) of the tibia according to surgical manuals. However, there is no theoretical basis for this practice. METHODS: Preoperative computed tomography data from 32 lower limbs of 31 Japanese patients who received UKA were used...
May 4, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28337656/what-factors-are-associated-with-femoral-component-internal-rotation-in-tka-using-the-gap-balancing-technique
#11
Seung-Yup Lee, Hong-Chul Lim, Ki-Mo Jang, Ji-Hoon Bae
BACKGROUND: When using the gap-balancing technique for TKA, excessive medial release and varus proximal tibial resection can be associated with internal rotation of the femoral component. Previous studies have evaluated the causes of femoral component rotational alignment with a separate factor analysis using unadjusted statistical methods, which might result in treatment effects being attributed to confounding variables. QUESTIONS/PURPOSES: (1) What pre- and intraoperative factors are associated with internal rotation of the femoral component in TKA using the gap balancing technique? (2) To what degree does femoral component rotation as defined by the navigation system differ from rotation as measured by postoperative CT? METHODS: Three hundred seventy-seven knees that underwent computer-assisted primary TKA attributable to degenerative osteoarthritis with varus or mild valgus alignment in which medial soft tissue release was performed, and those with preoperative radiographs including preoperative CT between October 2007 and June 2014 were included in the study...
August 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28314890/diagnostic-findings-caused-by-cutting-of-the-iliotibial-tract-and-anterolateral-ligament-in-an-acl-intact-knee-using-a-standardized-and-automated-clinical-knee-examination
#12
Timothy Lording, Shaun K Stinton, Philippe Neyret, Thomas P Branch
PURPOSE: The purpose of this study was to evaluate the separate contribution of the two definitions of the anterolateral ligament (ALL), the mid-third lateral capsular ligament (MTLCL) and deep capsule-osseous layer of the iliotibial tract (dcITT) in addition to the superficial iliotibial tract (sITT) to the control of tibial motion with respect to the femur during the application of force/torque seen during the three tests of the standard clinical knee examination (AP Lachman test, tibial axial rotation test and varus-valgus stress test)...
April 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28282213/anatomic-and-histological-investigation-of-the-anterolateral-capsular-complex-in-the-fetal-knee
#13
Soheil Sabzevari, Amir Ata Rahnemai-Azar, Marcio Albers, Monica Linde, Patrick Smolinski, Freddie H Fu
BACKGROUND: There is currently disagreement with regard to the presence of a distinct ligament in the anterolateral capsular complex of the knee and its role in the pivot-shift mechanism and rotatory laxity of the knee. PURPOSE: To investigate the anatomic and histological properties of the anterolateral capsular complex of the fetal knee to determine whether there exists a distinct ligamentous structure running from the lateral femoral epicondyle inserting into the anterolateral tibia...
May 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28267191/characterization-and-correction-of-errors-in-computing-contact-location-between-curved-articular-surfaces-application-to-total-knee-arthroplasty
#14
Joshua D Roth, Stephen M Howell, Maury L Hull
In total knee arthroplasty (TKA), one common metric used to evaluate innovations in component designs, methods of component alignment, and surgical techniques aimed at decreasing the high rate of patient-reported dissatisfaction is tibiofemoral contact kinematics. Tibiofemoral contact kinematics are determined based on the movement of the contact locations in the medial and lateral compartments of the tibia during knee flexion. A tibial force sensor is a useful instrument to determine the contact locations, because it can simultaneously determine contact forces and contact locations...
June 1, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28259491/does-tibial-slope-affect-perception-of-coronal-alignment-on-a-standing-anteroposterior-radiograph
#15
Adam J Schwartz, Bheeshma Ravi, Mark J Kransdorf, Henry D Clarke
BACKGROUND: A standing anteroposterior (AP) radiograph is commonly used to evaluate coronal alignment following total knee arthroplasty (TKA). The impact of coronal alignment on TKA outcomes is controversial, perhaps due to variability in imaging and/or measurement technique. We sought to quantify the effect of image rotation and tibial slope on coronal alignment. METHODS: Using a standard extramedullary tibial alignment guide, 3 cadaver legs were cut to accept a tibial tray at 0°, 3°, and 7° of slope...
February 10, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28089359/transient-and-long-time-kinetic-responses-of-the-cadaveric-leg-during-internal-and-external-foot-rotation
#16
Alexander R Mait, Adwait Mane, Jason L Forman, John Paul Donlon, Bingbing Nie, Richard W Kent
The purpose of this study was to determine the long-time and transient characteristics of the moment generated by external (ER) and internal (IR) rotation of the calcaneus with respect to the tibia. Two human cadaver legs were disarticulated at the knee joint while maintaining the connective tissue between the tibia and fibula. An axial rotation of 21° was applied to the proximal tibia to generate either ER or IR while the fibula was unconstrained and the calcaneus was permitted to translate in the transverse plane...
February 28, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/27900312/posterior-tibial-tendon-displacement-behind-the-tibia-and-its-interposition-in-an-irreducible-isolated-ankle-dislocation-a-case-report-and-literature-review
#17
Alessandro Ortolani, Roberto Bevoni, Alessandro Russo, Maurilio Marcacci, Mauro Girolami
Isolated posteromedial ankle dislocation is a rare condition thanks to the highly congruent anatomical configuration of the ankle mortise, in which the medial and lateral malleoli greatly reduce the rotational movement of the talus, and the strength of the ligaments higher than the malleoli affords protection against fractures. However, other factors, like medial malleolus hypoplasia, laxity of the ligaments, peroneal muscle weakness and previous ankle sprains, could predispose to pure dislocation. In the absence of such factors, only a complex high-energy trauma, with a rotational component, can lead to this event...
July 2016: Joints
https://www.readbyqxmd.com/read/27825937/effects-of-measurement-methods-for-tibial-rotation-axis-on-the-morphometry-in-korean-populations-by-gender
#18
Kyoung-Tak Kang, Juhyun Son, Oh-Ryong Kwon, Changhyun Baek, Dong Beom Heo, Kyoung-Mi Park, Ho-Joong Kim, Yong-Gon Koh
BACKGROUND: There have been arguments for methodology in tibial rotation axis measurement, which accordingly determines the morphometry of the proximal tibia in total knee arthroplasty. The morphometry of the proximal tibia for the Korean population is determined by gender, based on the anatomical tibial axis and reliable rotational orientation in knee replacements, to evaluate the size suitability of the currently available prostheses in Korea. METHODS: This study reconstructed the MRI images in three-dimensions for identification and measurement of the mediolateral (ML) and anteroposterior (AP) lengths of the proximal tibia and the tibial aspect ratio (ML/AP) using proximal tibial anthropometric data for 700 osteoarthritic knees (587 females and 113 males)...
January 2017: Knee
https://www.readbyqxmd.com/read/27642773/impact-of-axial-component-alignment-in-total-knee-arthroplasty-on-lower-limb-rotational-alignment-an-in-vitro-study
#19
Guenther Maderbacher, Clemens Baier, Hans-Robert Springorum, Hermann Maderbacher, Anne-Maria Birkenbach, Achim Benditz, Joachim Grifka, Armin Keshmiri
Correct rotational implant alignment is associated with increased postoperative function and implant survival in total knee arthroplasty (TKA). Due to conformity between tibial and femoral implants, particularly in full extension, we assumed a mutual interference of femoral and tibial component rotations. We, therefore, hypothesized that different rotational alignments of the tibial or femoral components change the rotational postures between the tibia and femur after TKA. In 10 healthy knees of whole body cadavers, TKA was performed...
May 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/27639879/mid-term-results-for-metaphyseal-sleeves-in-revision-knee-surgery
#20
Carlos Martin-Hernandez, Luis Javier Floria-Arnal, Maria Pilar Muniesa-Herrero, Teresa Espallargas-Doñate, Jose Adolfo Blanco-Llorca, Melchor Guillen-Soriano, Miguel Ranera-Garcia
PURPOSE: Metaphyseal titanium sleeves have been used to provide cementless fixation in challenging bone defects in revision knee arthroplasty. The aim of this study was to evaluate the mid-term results of radiological and clinical outcomes, for metaphyseal sleeves in type 1B and 2 defects of tibia and femur under the hypothesis that they would provide stable and prolonged fixation. METHODS: One hundred and thirty-four patients were included in a prospective study to evaluate the outcomes of knee revision with sleeves, together with stems and varus-valgus constrained mobile bearing prosthesis...
September 17, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
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