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https://www.readbyqxmd.com/read/28527700/failure-of-hightibialvarus-osteotomy-for-lateral-tibio-femoral-osteoarthritis-with-10%C3%A2-of-valgus-outcomes-in-19-patients
#1
G Mirouse, A Dubory, F Roubineau, A Poignard, P Hernigou, J Allain, C H Flouzat Lachaniette
BACKGROUND: Osteotomy is a rational approach to slowing knee osteoarthritis progression by modifying loads, thereby avoiding joint replacement in younger individuals. Varus femoral osteotomy is recommended only in patients with more than 10° of valgus. The objective here was to assess outcomes of tibialvarus osteotomy in patients with lateral compartment tibio-femoral osteoarthritis and less than 10° of valgus. MATERIAL AND METHODS: A single-centre retrospective study was conducted in 19 consecutive patients managed by high tibialvarus osteotomy between January 2005 and May 2012...
May 17, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28526236/management-of-severe-valgus-knee-by-total-unconstrained-arthroplasty-a-comparative-study-with-long-term-follow-up
#2
X Paredes-Carnero, A B Fernández-Cortiñas, J Escobar, J M Galdo, J G Babé
OBJECTIVE: To evaluate the use of unconstrained implants in the correction of large valgus deformities using total knee arthroplasty (TKA). MATERIAL AND METHOD: A total of 817 primary TKA operated between 1998 and 2006 were retrospectively assessed. 50 TKA were selected (group A) in 49 patients, with a minimum deformity of 15° of valgus, 41 cases were included. Another 50 ATR were selected (group B), with a maximum deformity of 15° of varus, finally including 44 cases in 42 patients...
May 16, 2017: Revista Española de Cirugía Ortopédica y Traumatología
https://www.readbyqxmd.com/read/28521382/-coincidence-and-therapy-of-dysalignments-and-degenerative-knee-cartilage-lesions-results-from-the-german-cartilageregistry-dgou
#3
Gunter Spahn, Jürgen Fritz, Dirk Albrecht, Peter Angele, Stefan Fickert, Matthias Aurich, Gunther O Hofmann, Phillip Niemeyer
Purpose This multicenter study was aimed to evaluate the coincidence of degenerative knee cartilage lesions with a varus or valgus dysalignment. Furthermore, the frequency of the combined surgery of cartilage treatments and corrective osteotomies are determined. Material and Methods A total of 1778 patients were included in the German CartilageRegistry (deadline 01.08.2016). In 90.6% of patients, the surgeon calculated the alignment by clinical observation. Varus or valgus conditions were measured radiologically in only 56...
May 18, 2017: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/28497104/stress-fracture-of-the-lateral-femoral-condyle-after-total-knee-arthroplasty
#4
Mohammad M Sarzaeem, Mahmood Jabalameli
BACKGROUND: This is to assess one of the rare complications after total knee replacement and to assess risk factors of failure. METHODS: 11 patients with varus knee and an average age of 67 years underwent TKA between 2005 and 2013. All patients returned with a sudden sharp knee pain, disability to walk and significant decrease in ROM about 4 to 8 weeks after surgery. Radiographic examination revealed a lateral femoral condylar stress fracture. RESULTS: After analyzing the images, we found common characteristics among all patients, which might be attributable to the later fracture including varus deformity>25, femoral component lateralization, and valgus correction...
March 2017: Archives of Bone and Joint Surgery
https://www.readbyqxmd.com/read/28493211/what-mechanisms-are-associated-with-tibial-component-failure-after-kinematically-aligned-total-knee-arthroplasty
#5
Alexander J Nedopil, Stephen M Howell, Maury L Hull
PURPOSE: Eight patients treated with kinematically-aligned (KA) total knee arthroplasty (TKA) presented with tibial component failure. We determined whether radiographic measurements and clinical characteristics are different between patients with and without tibial component failure to identify mechanisms of failure and strategies to reduce the risk. METHODS: Out of 3,212 primary TKAs (2,725 TKAs with a two-year minimum follow up), of which all were performed with KA, eight patients presented with tibial component failure...
May 11, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28481956/tibial-revision-knee-arthroplasty-with-metaphyseal-sleeves-the-effect-of-stems-on-implant-fixation-and-bone-flexibility
#6
Jan Nadorf, Stefan Kinkel, Simone Gantz, Eike Jakubowitz, J Philippe Kretzer
INTRODUCTION: Revision total knee arthoplasty often requires modular implants to treat bone defects of varying severity. In some cases, it may not be clear which module size and implant combination (e.g. sleeve and stem) should be chosen for a specific defect. When balancing implant stability and osseointegration against stress-shielding, it is important to choose an appropriate implant combination in order to match the given level of bone loss. Therefore, the necessity of stems in less extensive tibial defects and the advantage of different stems (lengths and stiffnesses) in combination with large metaphyseal sleeves on implant fixation and bone flexibility using a modular tibial revision knee system, were analyzed...
2017: PloS One
https://www.readbyqxmd.com/read/28471700/relationship-between-the-practice-of-physical-activity-and-quality-of-movement-in-adolescents-a-screening-tool-using-self-organizing-maps
#7
María Herrero-Herrero, Xavier García-Massó, Carlos Martínez-Corralo, Josep Prades-Piñón, Vicente Sanchis-Alfonso
OBJECTIVES: The aim of this study was to determine whether the most physically active adolescents have better lower limb control. METHODS: 31 high school students (12 males and 19 females) participated in this study. The Anterior Knee Pain Scale was used to find any cases of knee pain. Only subjects with high scores were selected, to exclude those with knee pain or lower limb injuries. Single Leg Squat and Tuck Jump Assessment were used to evaluate movements with two cameras in a two-dimensional assessment...
May 12, 2017: Physician and Sportsmedicine
https://www.readbyqxmd.com/read/28465849/mobile-bearing-total-knee-arthroplasty-for-valgus-knee-osteoarthritis-with-permanent-patellar-dislocation-a-case-report-and-review-of-the-literature
#8
Kohei Kamada, Tomoyuki Matsumoto, Koji Takayama, Daisuke Araki, Shingo Hashimoto, Shinya Hayashi, Takehiko Matsushita, Ryosuke Kuroda
Permanent patellar dislocation with tibiofemoral joint osteoarthritis is a relatively rare condition. To treat this condition, total knee arthroplasty with proximal or distal realignment of the extensor mechanism has been reported. We report a challenging case of an 80-year-old woman diagnosed with permanent patellar dislocation with tibiofemoral joint osteoarthritis treated by a mobile bearing total knee arthroplasty utilizing navigation system. Lateral retinaculum release was performed to improve patellar tracking; other proximal or distal realignment of the extensor mechanism was not necessary...
2017: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/28462799/a-novel-physiological-testing-device-to-study-knee-biomechanics-in-vitro
#9
Fabian van de Bunt, Kaj S Emanuel, Thomas Wijffels, Peter N Kooren, Idsart Kingma, Theodoor H Smit
BACKGROUND: To properly study knee kinetics, kinematics and the effects of injury and surgical treatment in vitro, the knee should be constrained as little as possible, while imposing physiological loads. A novel dynamic biomechanical knee system (BKS) is presented here. The aim of this study was to test the feasibility and reproducibility of the system and demonstrate its features with an Anterior Cruciate Ligament (ACL) lesion model. METHODS: Six goat knees were used in the current study...
April 25, 2017: Knee
https://www.readbyqxmd.com/read/28458472/plating-of-pilon-fractures-based-on-the-orientation-of-the-fibular-shaft-component-a-biomechanical-study-evaluating-plate-stiffness-in-a-cadaveric-fracture-model
#10
Gennadiy A Busel, J Tracy Watson
OBJECTIVES: To evaluate mechanically superior method of pilon fracture fixation by comparing axial stiffness between anterolateral and medial tibial locking plates in a cadaveric fracture model. METHODS: Eight matched pairs of fresh frozen cadaver specimens (lower limb after through-knee disarticulation) were used to eliminate confounder of bone quality. Simulated pilon fractures were created so that each pair represented either varus or valgus fracture pattern (AO 43-A2) with associated fibular fractures (transverse or comminuted)...
June 2017: Journal of Orthopaedics
https://www.readbyqxmd.com/read/28457760/a-comparison-between-chinese-and-caucasian-3-dimensional-bony-morphometry-in-presimulated-and-postsimulated-osteotomy-for-total-knee-arthroplasty
#11
Qian-Li Ma, Joseph D Lipman, Cheng-Kung Cheng, Xiao-Nan Wang, Yi-Yuan Zhang, Bin You
BACKGROUND: The bone morphologies of intact knees were measured and compared between Chinese and Caucasian populations. However, to assess if distinct designs of implants are necessary for the Chinese population owing to different morphologies and sizes, the knee measurements after osteotomy performed in total knee arthroplasty were evaluated. METHODS: Thirty-seven Caucasian and 50 Chinese patients' knees were examined using computed tomography scans. Mimics were applied to reconstruct 3-dimensional bone models...
April 7, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28455473/radiological-and-clinical-comparison-of-kinematically-versus-mechanically-aligned-total-knee-arthroplasty
#12
T Matsumoto, K Takayama, K Ishida, S Hayashi, S Hashimoto, R Kuroda
AIMS: The aim of this study was to compare the post-operative radiographic and clinical outcomes between kinematically and mechanically aligned total knee arthroplasties (TKAs). PATIENTS AND METHODS: A total of 60 TKAs (30 kinematically and 30 mechanically aligned) were performed in 60 patients with varus osteoarthritis of the knee using a navigation system. The angles of orientation of the joint line in relation to the floor, the conventional and true mechanical axis (tMA) (the line from the centre of the hip to the lowest point of the calcaneus) were compared, one year post-operatively, on single-leg and double-leg standing long leg radiographs between the groups...
May 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28447401/valgus-malalignment-and-prevalence-of-lateral-compartmental-radiographic-knee-osteoarthritis-oa-the-wuchuan-oa-study
#13
Bin Wang, Qiang Liu, Barton L Wise, Yan Ke, Dan Xing, Yuankun Xu, Yuqing Zhang, Jianhao Lin
AIM: To evaluate whether knee alignment explains the higher prevalence of lateral compartment tibiofemoral radiographic osteoarthritis (TFROA) among rural Chinese compared with that among Whites. METHODS: The Wuchuan OA Study is a population-based longitudinal study of risk factors for knee OA. At baseline 1030 participants had home interviews, clinical examinations and weight-bearing posteroanterior semi-flexed radiographs of the tibiofemoral joints. Anatomic knee alignment was measured using an e-film workstation and divided into three categories: normal (182°-184°), valgus (> 184°), and varus (< 182°) alignment...
April 26, 2017: International Journal of Rheumatic Diseases
https://www.readbyqxmd.com/read/28439636/kinematic-alignment-is-a-possible-alternative-to-mechanical-alignment-in-total-knee-arthroplasty
#14
Yong Seuk Lee, Stephen M Howell, Ye-Yeon Won, O-Sung Lee, Seung Hoon Lee, Hamed Vahedi, Seow Hui Teo
PURPOSE: A systematic review was conducted to answer the following questions: (1) Does kinematically aligned (KA) total knee arthroplasty (TKA) achieve clinical outcomes comparable to those of mechanically aligned (MA) TKA? (2) How do the limb, knee, and component alignments differ between KA and MA TKA? (3) How is joint line orientation angle (JLOA) changed from the native knee in KA TKA compared to that in MA TKA? METHODS: Nine full-text articles in English that reported the clinical and radiological outcomes of KA TKA were included...
April 24, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28439314/correction-of-lower-limb-deformities-in-children-with-renal-osteodystrophy-by-guided-growth-technique
#15
C Gigante, A Borgo, M Corradin
PURPOSE: Renal osteodystrophy (ROD) may cause severe lower limb deformities in children. The purpose of this study is to evaluate the efficacy of the temporary hemiepiphysiodesis for the correction of lower limb deformities in children with ROD. METHODS: Guided growth correction by hemiepiphysiodesis has been performed in skeletally immature patients with deformities of the lower limbs caused by ROD. The correction of the mechanical axes of the lower limbs and its correction speed have been evaluated...
2017: Journal of Children's Orthopaedics
https://www.readbyqxmd.com/read/28439302/femoral-osteochondritis-of-the-knee-prognostic-value-of-the-mechanical-axis
#16
P Gonzalez-Herranz, M L Rodriguez, C de la Fuente
PURPOSE: Femoral osteochondritis dissecans (OCD) is a disorder of unknown aetiology and variable prognosis that causes knee pain. In this paper, the authors study the impact of lower limb malalignment on the development and prognosis of OCD. METHODS: After anteroposterior (AP) and lateral radiograph and MRI of the knee, 53 cases of OCD were diagnosed. All patients were studied by standing full-length AP radiograph of the lower extremities in order to analyse the relationship between the femorotibial and mechanical axis and the location and stability of the osteochondritis...
2017: Journal of Children's Orthopaedics
https://www.readbyqxmd.com/read/28433387/how-do-rocker-soled-shoes-influence-the-knee-adduction-moment-in-people-with-knee-osteoarthritis-an-analysis-of-biomechanical-mechanisms
#17
Elizabeth G Madden, Crystal O Kean, Tim V Wrigley, Kim L Bennell, Rana S Hinman
The primary objective was to examine mechanisms behind previously observed changes in the knee adduction moment (KAM) with rocker-soled shoes, in participants sub-grouped according to whether they experienced an immediate decrease, or increase, in peak KAM. In subgroups where frontal plane knee ground reaction force (GRF) lever-arm emerged as a significant predictor, a secondary aim was to examine biomechanical factors that contributed to change in this parameter. Thirty individuals with symptomatic, radiographic knee osteoarthritis (OA) underwent 3D gait analysis in unstable rocker-soled shoes and non-rocker-soled shoes...
April 9, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28433348/the-influence-of-polyethylene-bearing-thickness-on-the-tibiofemoral-kinematics-of-a-bicruciate-retaining-total-knee-arthroplasty
#18
Geert Peersman, Josh Slane, Margo Dirckx, Arne Vandevyver, Philipp Dworschak, Thomas J Heyse, Lennart Scheys
BACKGROUND: The recently reintroduced bicruciate retaining Total Knee Arthroplasty (BCR TKA) is an effort to reproduce kinematics closer to the native knee. However, there is no data on appropriate balancing with this implant. Balancing is crucial and challenging as medial and lateral polyethylene (PE) inlays are modular, which allows for placement of different thicknesses in the medial and lateral compartments. This study aimed at providing a detailed kinematic view on balancing BCR TKA...
April 19, 2017: Knee
https://www.readbyqxmd.com/read/28431561/the-evaluation-of-the-role-of-medial-collateral-ligament-maintaining-knee-stability-by-a-finite-element-analysis
#19
Dong Ren, Yueju Liu, Xianchao Zhang, Zhaohui Song, Jian Lu, Pengcheng Wang
BACKGROUND: A three-dimensional finite element model (FEM) of the knee joint was established to analyze the biomechanical functions of the superficial and deep medial collateral ligaments (MCLs) of knee joints and to investigate the treatment of the knee medial collateral ligament injury. METHODS: The right knee joint of a healthy male volunteer was subjected to CT and MRI scans in the extended position. The scanned data were imported into MIMICS, Geomagic, and ANSYS software to establish a three-dimensional FEM of the human knee joint...
April 21, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28424860/influence-of-tibial-hybrid-fixation-on-graft-tension-and-stability-in-acl-double-bundle-reconstruction
#20
B H Drews, A Seitz, J Huth, G Bauer, A Ignatius, L Dürselen
PURPOSE: Initial graft tension in anterior cruciate ligament (ACL) reconstruction affects stability and tension loss at follow-up. This study investigated the influence of hybrid tibial fixation in 3-tunnel double-bundle ACL reconstruction on initial graft tension and tension change and stability under anterior and combined rotatory loads. METHODS: Eleven fresh-frozen cadaveric knees were reconstructed with an ACL double bundle using a 3-tunnel technique. Grafts were tightened to 80 N in 60° (AM bundle) and 15° (PL bundle) of flexion...
April 19, 2017: Archives of Orthopaedic and Trauma Surgery
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