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Tibia plateau

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https://www.readbyqxmd.com/read/28067099/dynamic-rsa-for-the-evaluation-of-inducible-micromotion-of-oxford-uka-during-step-up-and-step-down-motion
#1
Kristian Horsager, Bart L Kaptein, Lone RøMer, Peter B Jørgensen, Maiken Stilling
Background and purpose - Implant inducible micromotions have been suggested to reflect the quality of the fixation interface. We investigated the usability of dynamic RSA for evaluation of inducible micromotions of the Oxford Unicompartmental Knee Arthroplasty (UKA) tibial component, and evaluated factors that have been suggested to compromise the fixation, such as fixation method, component alignment, and radiolucent lines (RLLs). Patients and methods - 15 patients (12 men) with a mean age of 69 (55-86) years, with an Oxford UKA (7 cemented), were studied after a mean time in situ of 4...
January 9, 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28060180/new-single-stage-double-osteotomy-for-late-presenting-infantile-tibia-vara-a-comprehensive-approach
#2
Edward Abraham, David Toby, Michelle Welborn, Cory W Helder, Angela Murphy
BACKGROUND: Successful surgical treatment of late-presenting infantile tibia vara (ITV) patient requires the correction of oblique deformities. The purpose of this study was to report on a new comprehensive approach to correct and prevent recurrence of these deformities with a single procedure. METHODS: Medical records of 23 consecutive children (7 to 18 y) with advanced ITV (29 knees) were retrospectively reviewed after a mean of 7.3 years postoperatively (range, 2 to 22 y)...
January 5, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28029358/analysis-of-an-early-intervention-distal-femoral-resurfacing-implant-for-medial-osteoarthritis
#3
Miriam Chaudhary, Peter S Walker
A design concept was formulated for implants to treat medial osteoarthritis of the knee, using a metal plate resurfacing of the tibia plateau and a plastic bearing embedded in the distal end of the femur. A finite element analysis was carried out to determine whether a metal backing would be needed for the femoral component, and to what extent the stress and strain distribution in the trabecular bone surrounding the implant would match the normal intact condition. The CT scans from three knees scheduled for unicompartmental replacement were selected to generate computer models with variable bone densities in each element to cover a range of density patterns...
October 6, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27939623/factors-associated-with-meniscal-body-extrusion-on-knee-mri-in-overweight-and-obese-women
#4
F Zhang, S M Bierma-Zeinstra, E H G Oei, A Turkiewicz, M Englund, J Runhaar
OBJECTIVE: To determine factors associated with higher degree of meniscal body extrusion in overweight and obese women at high risk of knee osteoarthritis (OA). DESIGN: We used baseline data of the PRevention of knee Osteoarthritis in Overweight Females (PROOF) study, Netherlands, comprising overweight or obese women aged 50-60 years, free of clinical knee OA. All subjects completed a questionnaire on knee complaints and physical activity, underwent physical examination, radiography, and 1...
December 7, 2016: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/27923624/a-novel-3d-approach-for-determination-of-frontal-and-coronal-plane-tibial-slopes-from-mr-imaging
#5
Amirhesam Amerinatanzi, Rodney Summers, Kaveh Ahmadi, Vijay K Goel, Timothy E Hewett, Edward Nyman
BACKGROUND: The proximal tibia is geometrically complex, asymmetrical, and variable, is heavily implicated in arthrokinematics of the knee joint, and thus a contributor to knee pathologies such as non-contact anterior cruciate ligament injury. Medial, lateral, and coronal tibial slopes are anatomic parameters that may increase predisposition to knee injuries, but the extent to which each contributes has yet to be fully realized. Previously, two-dimensional methods have quantified tibial slopes, but more reliable 3D methods may prove advantageous...
December 3, 2016: Knee
https://www.readbyqxmd.com/read/27891668/systematic-mapping-of-the-subchondral-bone-3d-microarchitecture-in-the-human-tibial-plateau-variations-with-joint-alignment
#6
Bryant C Roberts, Dominic Thewlis, Lucian B Solomon, Graham Mercer, Karen J Reynolds, Egon Perilli
Tibial subchondral bone plays an important role in knee osteoarthritis (OA). Microarchitectural characterization of subchondral bone plate (SBP), underlying subchondral trabecular bone (STB) and relationships between these compartments, however, is limited. The aim of this study was to characterize the spatial distribution of SBP thickness, SBP porosity and STB microarchitecture, and relationships among them, in OA tibiae of varying joint alignment. Twenty-five tibial plateaus from end-stage knee-OA patients, with varus (n = 17) or non-varus (n = 8) alignment were micro-CT scanned (17 μm/voxel)...
November 7, 2016: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/27890319/diachronic-changes-in-size-and-shape-of-human-proximal-tibia-in-central-europe-during-the-latest-1200-years
#7
H Brzobohatá, V Krajíček, Z Horák, P Sedlak, J Velemínská
During the past twelve centuries, the stature of Central European inhabitants has increased significantly with corresponding changes in the size of lower limb bones. The aim of our study was to determine whether these changes have occurred strictly in relation to size or if the shape of skeletal structures has been altered simultaneously. Diachronic size and shape changes in the proximal part of tibia in a Central European population (Czech Republic) were studied using geometric morphometrics (principal components analysis, Hotelling's test, linear discriminant analysis)...
December 2016: Homo: Internationale Zeitschrift Für die Vergleichende Forschung Am Menschen
https://www.readbyqxmd.com/read/27884644/evaluating-augmentation-with-calcium-phosphate-cement-chronos-inject-for-bone-defects-after-internal-fixation-of-proximal-tibial-fractures-a-prospective-multi-center-observational-study
#8
Ki Chul Park, Chang-Wug Oh, Young-Hoon Jo
INTRODUCTION: Managing subchondral bone defects in proximal tibia fractures after plateau reduction is an important consideration.ChronOSInjectis a recently developed calcium phosphate bone substitute that shows relatively fast osteointegration. HYPOTHESIS: UsingchronOS Inject during internal fixation of proximal tibial fractures provides a satisfactory treatment option that is both clinically and radiologically safe. MATERIALS AND METHODS: Patients enrolled in this study were treated with ChronOS Injectbone void filler, during internal fixation of proximal tibial fractures...
November 21, 2016: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/27876267/open-wedge-high-tibial-osteotomy-using-three-dimensional-printed-models-experimental-analysis-using-porcine-bone
#9
Jun-Dae Kwun, Hee-June Kim, Jaeyoung Park, Il-Hyung Park, Hee-Soo Kyung
BACKGROUND: The purpose of this study was to evaluate the usefulness of three-dimensional (3D) printed models for open wedge high tibial osteotomy (HTO) in porcine bone. METHODS: Computed tomography (CT) images were obtained from 10 porcine knees and 3D imaging was planned using the 3D-Slicer program. The osteotomy line was drawn from the three centimeters below the medial tibial plateau to the proximal end of the fibular head. Then the osteotomy gap was opened until the mechanical axis line was 62...
November 18, 2016: Knee
https://www.readbyqxmd.com/read/27876042/the-effect-of-screw-thread-length-on-initial-stability-of-schatzker-type-1-tibial-plateau-fracture-fixation-a-biomechanical-study
#10
Ahmet Salduz, Fevzi Birisik, Gokhan Polat, Bugra Bekler, Ergun Bozdag, Onder Kilicoglu
BACKGROUND: This study compares the cyclic loading properties and failure loads of two screw combinations on a synthetic Schatzker type 1 tibia fracture model. Our hypothesis was that after adequate compression with first a partially threaded screw, addition of a fully threaded screw would provide more stability than an addition of a second partially threaded screw. METHODS: The Schatzker type 1 tibial plateau fracture model was created. Fixation was obtained in group A (n = 10) with two partially threaded screws and in group B (n = 10) with one fully threaded screw and one partially threaded screw...
November 22, 2016: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/27836579/valgus-stress-radiographs-predict-lateral-compartment-cartilage-thickness-but-not-cartilage-degeneration-in-varus-osteoarthritis
#11
Wenzel Waldstein, Tom Schmidt-Braekling, Giorgio Perino, Maximilian F Kasparek, Reinhard Windhager, Friedrich Boettner
BACKGROUND: Intact cartilage in the lateral compartment is an important requirement for medial unicompartmental knee arthroplasty. This study sought to determine how measurements of joint space width in the lateral compartment on valgus stress radiographs compare to cartilage thickness as measured with a precise needle test, and whether cartilage thickness is a predictor of cartilage degeneration. METHODS: A consecutive series of 100 knees undergoing total knee arthroplasty for end-stage varus osteoarthritis was studied...
October 5, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27830485/lateral-compartment-osteophytes-are-not-associated-with-lateral-compartment-cartilage-degeneration-in-arthritic-varus-knees
#12
Wenzel Waldstein, Maximilian F Kasparek, Martin Faschingbauer, Reinhard Windhager, Friedrich Boettner
BACKGROUND: Progression of arthritis in the lateral compartment is one of the main failure modes of unicompartmental knee arthroplasty (UKA). The decision regarding whether to perform a medial UKA sometimes is made based on whether lateral-compartment osteophytes are visible on plain radiographs obtained before surgery, but it is not clear whether the presence of lateral-compartment osteophytes signifies that the cartilage in the lateral compartment is arthritic. QUESTIONS/PURPOSES: (1) Is the presence of lateral compartment osteophytes associated with biomechanical properties of lateral-compartment cartilage, and (2) are osteophytes in the lateral compartment associated with particular histologic features of cartilage in the lateral compartment? METHODS: Between May 2010 and January 2012, we performed 201 TKAs for varus osteoarthritis confirmed on standardized AP hip-to-ankle standing radiographs...
November 9, 2016: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/27825594/location-of-the-natural-knee-axis-for-internal-external-tibial-rotation
#13
Daniel V Boguszewski, Nirav B Joshi, Paul R Yang, Keith L Markolf, Frank A Petrigliano, David R McAllister
BACKGROUND: Rotating hinge and mobile bearing tray knee replacement designs utilize a single fixed axis for tibial rotation, yet there is little published information regarding the natural internal-external axis (IEA) for tibial rotation. Identifying the IEA should provide an opportunity for reproducing normal knee kinematics and maintaining the balance of forces in the soft tissues that help control rotation of the tibia. METHODS: The location and orientation of the IEA relative to the tibial plateau were calculated in 46 fresh frozen human cadaveric specimens using an instant center of rotation analysis at fixed knee flexion angles ranging from five degrees to 105°...
December 2016: Knee
https://www.readbyqxmd.com/read/27820852/osteoarthritis-in-the-knee-joints-of-g%C3%A3-ttingen-minipigs-after-resection-of-the-anterior-cruciate-ligament-missing-correlation-of-mri-gene-and-protein-expression-with-histological-scoring
#14
Gregor Reisig, Michael Kreinest, Wiltrud Richter, Mechthild Wagner-Ecker, Dietmar Dinter, Ulrike Attenberger, Barbara Schneider-Wald, Stefan Fickert, Markus L Schwarz
INTRODUCTION: The Göttingen Minipig (GM) is used as large animal model in articular cartilage research. The aim of the study was to introduce osteoarthritis (OA) in the GM by resecting the anterior cruciate ligament (ACLR) according to Pond and Nuki, verified by histological and magnetic resonance imaging (MRI) scoring as well as analysis of gene and protein expression. MATERIALS AND METHODS: The eight included skeletally mature female GM were assessed after ACLR in the left and a sham operation in the right knee, which served as control...
2016: PloS One
https://www.readbyqxmd.com/read/27810434/coronal-subluxation-of-the-proximal-tibia-relative-to-the-distal-femur-after-opening-wedge-high-tibial-osteotomy
#15
Yasushi Akamatsu, Satoshi Ohno, Hideo Kobayashi, Yoshihiro Kusayama, Ken Kumagai, Tomoyuki Saito
BACKGROUND: The coronal subluxation of the proximal tibia relative to the distal femur is a common radiological finding in patients with knee osteoarthritis. The purpose was to evaluate whether the coronal subluxation was corrected after opening wedge high tibial osteotomy (OWHTO), and whether this subluxation was one cause of inconsistency between the actual and predicted alignments (correction loss). METHODS: Fifty-one patients (55 knees) were treated with OWHTO...
October 31, 2016: Knee
https://www.readbyqxmd.com/read/27804139/outcome-of-tibial-closing-wedge-osteotomy-in-55-cranial-cruciate-ligament-deficient-stifles-of-small-dogs-15-kg
#16
Kathryn A Campbell, John T Payne, Michael T Doornink, Jamie Haggerty
OBJECTIVE: To describe the outcome of cranial closing wedge osteotomy (CWO) of the tibia for treatment of cranial cruciate ligament (CrCL)-deficient stifles in dogs with a body weight of <15 kg. STUDY DESIGN: Retrospective case series. ANIMALS: Forty-five client-owned dogs (n=55 stifles). METHODS: Medical records (2005-2014), radiographs, and owner questionnaire were used to identify the surgical procedure performed, associated complications and outcome in 45 dogs undergoing CWO in 55 stifles...
November 2016: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/27776664/subchondral-insufficiency-fracture-of-the-knee-a-recognizable-associated-soft-tissue-edema-pattern-and-a-similar-distribution-among-men-and-women
#17
Andrew S Wilmot, Alexander T Ruutiainen, Prashant T Bakhru, Mark E Schweitzer, Nogah Shabshin
OBJECTIVE: Primary: to describe the presence and pattern of soft tissue edema in subchondral insufficiency fractures of the knee (SIFK). Secondary: to investigate the gender distribution and identify factors associated with disease progression. METHODS: MR images of 74 SIFKs in 74 patients were retrospectively reviewed for soft tissue edema presence and location, meniscal tears and extrusion and synovitis. The clinical records were reviewed for age, gender, and BMI...
November 2016: European Journal of Radiology
https://www.readbyqxmd.com/read/27692866/coronal-alignment-on-the-single-limb-stance-radiograph-in-posterolateral-rotatory-instability-osteoarthritis-and-healthy-knees
#18
Young Gon Na, Moon Jong Chang, Sang Hwa Eom, Seok Jin Kim, Seong Cheol Park, Tae Kyun Kim
BACKGROUND: We aimed to determine whether coronal alignment measured on the single-limb stance (SLS) radiographs differs from those on the double-limb stance (DLS) images. We also investigated whether the size of such differences was affected by the knee pathology, lower limb alignment, and geometry of the tibia or femur. METHODS: We measured coronal alignment with mechanical tibiofemoral angle (MTFA) on the DLS and SLS radiographs in patients with posterolateral rotatory instability (PLRI, 30 knees), osteoarthritis (OA) with varus deformity who were scheduled for high tibial osteotomy (HTO) (60 knees), and in normal control (60 knees)...
September 28, 2016: Knee
https://www.readbyqxmd.com/read/27685766/the-hoop-plate-for-posterior-bicondylar-shear-tibial-plateau-fractures-description-of-a-new-surgical-technique
#19
Vincenzo Giordano, Joseph Schatzker, Mauricio Kfuri
High-energy fractures of the proximal tibia with extensive fragmentation of the posterior rim of the tibial plateau are challenging. This technique aims to describe a method on how to embrace the posterior rim of the tibial plateau by placing a horizontal precontoured one-third tubular plate wrapped around its corners. This method, which we named "hoop plating," is mainly indicated for cases of crushed juxta-articular rim fractures, aiming to restore cortical containment of the tibial plateau. Through a lateral approach with a fibular head osteotomy (Lobenhoffer approach), both anterolateral and posterolateral fragments are directly reduced and supported by a one-third tubular plate of adequate length...
September 29, 2016: Journal of Knee Surgery
https://www.readbyqxmd.com/read/27659171/influence-of-sagittal-plane-malpositioning-of-the-patella-on-anterior-knee-pain-after-tibia-intramedullary-nailing
#20
Ismail Turkmen, Yavuz Saglam, Fatih Turkmensoy, Bahattin Kemah, Adnan Kara, Koray Unay
PURPOSE: Anterior knee pain (AKP) is one of the most common complications after tibia intramedullary surgery. We evaluated changes in patellar tendon length after tibia intramedullary nailing surgery using a transtendinous approach and assessed the importance of nail position in relation to the anterior tibial cortex and joint line. METHODS: Two surgeons blinded to patients' pain status measured both the knee Insall-Salvati and Caton-Deschamps indexes on 30° flexion lateral knee X-rays of 33 patients...
September 22, 2016: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
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