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tibial slope

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https://www.readbyqxmd.com/read/29623377/the-increase-in-posterior-tibial-slope-provides-a-positive-biomechanical-effect-in-posterior-stabilized-total-knee-arthroplasty
#1
Kyoung-Tak Kang, Sae Kwang Kwon, Juhyun Son, Oh-Ryong Kwon, Jun-Sang Lee, Yong-Gon Koh
PURPOSE: This study aims to clarify the influence of the posterior tibial slope (PTS) on knee joint biomechanics after posterior-stabilized (PS) total knee arthroplasty (TKA) using a computer simulation. METHODS: A validated TKA computational model was used to evaluate and quantify the effects of an increased PTS. In order to conduct a squat simulation, models with a - 3° to 15° PTS using increments of 3° were developed. Forces on the quadriceps and collateral ligament, a tibial posterior translation, contact point on a polyethylene (PE) insert, and contact stress on the patellofemoral (PF) joint and post in a PE insert were compared...
April 5, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29615034/multipulse-transcranial-electrical-stimulation-tes-normative-data-for-motor-evoked-potentials-in-healthy-horses
#2
Sanne Lotte Journée, Henricus Louis Journée, Cornelis Marinus de Bruijn, Cathérine John Ghislaine Delesalle
BACKGROUND: There are indications that transcranial electrical stimulation (TES) assesses the motor function of the spinal cord in horses in a more sensitive and reproducible fashion than transcranial magnetic stimulation (TMS). However, no normative data of TES evoked motor potentials (MEP) is available. RESULTS: In this prospective study normative data of TES induced MEP wave characteristics (motor latency times (MLT); amplitude and waveform) was obtained from the extensor carpi radialis (ECR) and tibial cranialis (TC) muscles in a group of healthy horses to create a reference frame for functional diagnostic purposes...
April 3, 2018: BMC Veterinary Research
https://www.readbyqxmd.com/read/29614621/three-dimensional-finite-element-analysis-of-the-influence-of-posterior-tibial-slope-on-the-anterior-cruciate-ligament-and-knee-joint-forward-stability
#3
Yong Qi, Hongtao Sun, Yueguang Fan, Feimeng Li, Yunting Wang, Chana Ge
OBJECTIVE: To explore the biomechanical influence of posterior tibial angle on the anterior cruciate ligament and knee joint forward stability. METHODS: The left knee joint of a healthy volunteer was scanned by CT and MRI. The data were imported into Mimics software to obtain 3D models of bone, cartilage, meniscus and ligament structures, and then Geomagic software was used to modify of the image. The relative displacement between tibia and femur and the stress of ACL were recorded...
March 23, 2018: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/29602970/more-accurate-correction-can-be-obtained-using-a-three-dimensional-printed-model-in-open-wedge-high-tibial-osteotomy
#4
Hee-June Kim, Jaeyeong Park, Ji-Yeon Shin, Il-Hyung Park, Kyeong-Hyeon Park, Hee-Soo Kyung
PURPOSE: The purpose of this study was to compare the accuracy of the preoperative planning method using a three-dimensional (3D) printed model with that of a method using picture archiving and communication system (PACS) images in high tibial osteotomy (HTO). METHODS: Patients who underwent HTO using a 3D printed model (20 patients) and a method based on PACS images (20 patients) from 2012 to 2016 were compared. After obtaining the correction angle, in the 3D printed method, the wedge-shaped 3D printed model was designed...
March 30, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29582433/calcaneal-adduction-and-eversion-are-coupled-to-talus-and-tibial-rotation
#5
Katina Mira Fischer, Steffen Willwacher, Anton Arndt, Gert-Peter Brüggemann
The purpose of this study was to quantify isolated coupling mechanisms of calcaneal adduction/abduction and calcaneal eversion/inversion to proximal bones in vitro. The in vitro approach is necessary because in vivo both movements appear together, making it impossible to determine the extent of their individual contribution to overall ankle joint coupling. Eight fresh frozen foot-leg specimens were tested. Data describing bone orientation and coupling mechanisms between segments were obtained using bone pin marker triads...
March 26, 2018: Journal of Anatomy
https://www.readbyqxmd.com/read/29578774/greater-static-anterior-tibial-subluxation-of-the-lateral-compartment-after-an-acute-anterior-cruciate-ligament-injury-is-associated-with-an-increased-posterior-tibial-slope
#6
Guan-Yang Song, Hui Zhang, Jin Zhang, Xin Liu, Zhe Xue, Yi Qian, Hua Feng
BACKGROUND: Static anterior tibial subluxation of the lateral compartment after an anterior cruciate ligament (ACL) injury highlights an increased anterior position of the tibia relative to the femur. However, the precise cause of this phenomenon is not entirely clear. Recently, an increased posterior tibial slope (PTS) has been identified as an independent risk factor for noncontact ACL injuries. HYPOTHESIS: An increased PTS is associated with an increased anterior position of the lateral compartment of the tibia relative to the femur after acute ACL injuries...
March 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29567061/influence-of-stem-length-on-component-flexion-and-posterior-condylar-offset-in-revision-total-knee-arthroplasty
#7
Max Ettinger, Peter Savov, Omar Balubaid, Henning Windhagen, Tilman Calliess
BACKGROUND: Hyperextension of the femoral component and excessive slope of the tibial component may delay the cam-post engagement in semi-constrained revision total knee arthroplasty (TKA). Further, it may compromise the posterior condylar offset (PCO). No prior study has determined whether a short 50-mm stem, or longer stems (100mm and 150mm) lead to less hyperextension of the femoral component or excessive slope and its influence on the posterior condylar offset. METHODS: Flexion/extension of the femoral component with respect to the sagittal femoral anatomic axis of the distal diaphysis (SFAA) and the tibial slope were measured from rotationally controlled lateral X-rays of 126 consecutive patients with a one- or two-stage revision TKA...
March 19, 2018: Knee
https://www.readbyqxmd.com/read/29550413/sex-differences-in-common-sports-injuries
#8
REVIEW
Cindy Lin, Ellen Casey, Daniel Herman, Nicole Katz, Adam Tenforde
Common sports injuries include bone stress injuries (BSIs), anterior cruciate ligament (ACL) injuries, and concussions. Less commonly recognized are the specific sex differences in epidemiology, risk factors, and outcomes of these conditions by sex. An understanding of these factors can improve their clinical management, from prescribing appropriate prehabilitation to guiding postinjury rehabilitation and return to play. This narrative review summarizes the sex differences in the diagnosis and management of BSIs, ACL injuries, and concussions...
March 14, 2018: PM & R: the Journal of Injury, Function, and Rehabilitation
https://www.readbyqxmd.com/read/29548535/flexion-valgus-unicondylar-tibial-plateau-depression-fracture-pattern-classification-and-treatment
#9
Yu Zhang, Lijun Song, Xiang Li, Jiahu Fang
PURPOSE: The authors have identified a subset of unicondylar tibial plateau depression fracture patterns caused by a flexion-valgus force. The purpose of this study was to describe this fracture pattern and suggest a modified lateral approach that may allow for improved reduction and stabilization. METHODS: The preoperative radiographs and CT scans of 102 patients who sustained unicondylar tibial plateau fractures (OTA 41B) were reviewed. Twenty-six fracture patients had posterolateral (PL) tibial plateau depression fractures...
March 7, 2018: Injury
https://www.readbyqxmd.com/read/29534412/-revision-of-schatzker-type-%C3%A2-tibial-plateau-fracture-failure-focus-on-the-recovery-of-lower-limb-alignment
#10
R J Cong, J F Liu, Y Jiang, Duolikun Dilixiati, X D Hou, L P Zheng
Objective: To explore the influence of the lower extremity abnormal alignment and the joint surface, and to explore the surgical skills. Methods: Twenty-two cases of tibial plateau Schatzker Ⅵ fracture internal fixation failure revision from January 2012 to January 2017 in Department of Orthopedics, Shanghai 10(th) Hospital.One year follow-up after initial surgery to make sure of failure.Three-dimensional CT scan, radiography, infection index, gait analysis, knee joint ROM, femur tibia angle, tibial plateau tibial shaft angle and posterior slope if tibial plateau were observed...
March 1, 2018: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
https://www.readbyqxmd.com/read/29530354/does-posterior-tibial-slope-affect-graft-rupture-following-acl-reconstruction
#11
Chae Chil Lee, Yoon Seok Youm, Sung Do Cho, Seung Hyun Jung, Mun Hee Bae, Seon Jae Park, Han Wook Kim
PURPOSE: The purpose of this study was to evaluate the association between posterior tibial slope (PTS) and anterior cruciate ligament (ACL) graft rupture in patients who have undergone ACL reconstruction by comparing results in patients who experienced graft rupture and a matched control group. METHODS: The study included 64 knees of 64 patients (58 men and 6 women), of mean age 31 years (range, 18-60 years) who underwent revision ACL reconstruction for ACL graft rupture, as well as a control group without ACL graft rupture matched for age, sex, body mass index (BMI), and left or right side...
March 9, 2018: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29525547/interactive-effect-of-femoral-posterior-condylar-offset-and-tibial-posterior-slope-on-knee-flexion-in-posterior-cruciate-ligament-substituting-total-knee-arthroplasty
#12
Hyuk-Soo Han, Seung-Baik Kang
BACKGROUND: This work aimed to evaluate the changes in the femoral posterior condylar offset (PCO) and tibial slope after posterior cruciate ligament (PCL)-substituting total knee arthroplasty (TKA), and to address the presence of any interactive effect between the two on knee flexion. METHODS: Fifty-two PCL-substituting TKAs were performed using a posterior referencing system. Three-dimensional reconstructed computed tomographic (CT) images were used to evaluate PCO and tibial slope before and after arthroplasty...
March 7, 2018: Knee
https://www.readbyqxmd.com/read/29520668/3d-patient-imaging-and-retrieval-analysis-help-understand-the-clinical-importance-of-rotation-in-knee-replacements
#13
Arianna Cerquiglini, Johann Henckel, Harry Hothi, Niccoló Rotigliano, Michael T Hirschmann, Alister J Hart
PURPOSE: The purpose of the present study was to correlate highly accurate CT measurements of pre-revision total knee arthroplasty (TKA) implant position with findings of retrieval analysis post-revision, to understand the clinical relevance of TKA orientation. METHODS: This study involved 53 retrieved TKA implants with pre-revision 3D-CT scans used to determine coronal (varus-valgus), sagittal (tibial slope) and rotational (internal rotation-external rotation) TKA orientation as well as tibiofemoral leg axis...
March 8, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29514372/posterior-condyle-offset-and-maximum-knee-flexion-following-a-cruciate-retaining-total-knee-arthroplasty
#14
Wei Wang, Bin Yue, JianHua Wang, Hany Bedair, Harry Rubash, Guoan Li
Inconsistent data has been reported on the effect of the femoral posterior condyle offset (PCO) on the maximal knee flexion after total knee arthroplasty (TKA). This study investigated the relationship between the postoperative changes of the PCO and the changes of maximal knee flexion after a cruciate retaining (CR) TKA. Nine patients with medial osteoarthritis (OA) in one knee were investigated. Before operation, each index knee was magnetic resonance imaging (MRI) scanned for construction of a three-dimensional (3D) knee model...
March 7, 2018: Journal of Knee Surgery
https://www.readbyqxmd.com/read/29484496/the-femoral-component-alignment-resulting-from-spacer-block-technique-is-not-worse-than-after-intramedullary-guided-technique-in-medial-unicompartimental-knee-arthroplasty
#15
Georg Matziolis, Tanja Mueller, Frank Layher, Andreas Wagner
PURPOSE: Although the spacer block technique has been recommended for the implantation of unicompartmental knee arthroplasty (UKA), there is still a lack of data concerning the resulting component positioning. METHODS: This retrospective study included 193 consecutive patients who had undergone medial UKA using the spacer technique. On the basis of the postoperative long standing radiographs, the coronal component alignment was determined in relation to the mechanical axes and the sagittal component alignment in relation to the anatomical axes of the tibia and femur...
February 26, 2018: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/29482301/intentionally-increased-flexion-angle-of-the-femoral-component-in-mobile-bearing-unicompartmental-knee-arthroplasty
#16
Kye-Youl Cho, Kang-Il Kim, Sang-Jun Song, Kyu-Jin Kim
Purpose: The purpose of this study was to determine the results of mobile bearing unicompartmental knee arthroplasty (UKA) with an intentionally increased flexion angle of the femoral component in patients requiring high flexion. Materials and Methods: We investigated 45 knees treated by UKA. Clinically, we measured the range of motion (ROM) and the American Knee Society (AKS) score preoperatively and at final follow-up and investigated complications. Radiologically, we measured the flexion angle of the femoral component, the posterior slope angle of the tibial component, the femorotibial angle and mechanical axis of the limb postoperatively...
March 1, 2018: Knee Surgery & related Research
https://www.readbyqxmd.com/read/29476426/current-practice-of-orthopaedic-surgical-skills-training-raises-performance-of-supervised-residents-in-total-knee-arthroplasty-to-levels-equal-to-those-of-orthopaedic-surgeons
#17
Luuk Theelen, Cheryll Bischoff, Bernd Grimm, Ide C Heyligers
AIM: To investigate whether the current, generally accepted practice of orthopaedic surgical skills training can raise the performance of supervised residents to levels equal to those of experienced orthopaedic surgeons when it comes to clinical outcomes or implant position after total knee arthroplasty. METHODS: In a retrospective analysis of primary total knee arthroplasty outcomes (minimum follow-up of 12 months) procedures were split into two groups: supervised orthopaedic residents as first surgeon (group R), and experienced senior orthopaedic surgeons as first surgeon (group S)...
February 23, 2018: Perspectives on Medical Education
https://www.readbyqxmd.com/read/29476198/posterior-tibial-slope-impacts-intraoperatively-measured-mid-flexion-anteroposterior-kinematics-during-cruciate-retaining-total-knee-arthroplasty
#18
Yifei Dai, Michael B Cross, Laurent D Angibaud, Cyril Hamad, Amaury Jung, Jean-Yves Jenny
PURPOSE: Posterior tibial slope (PTS) for cruciate-retaining (CR) total knee arthroplasty (TKA) is usually pre-determined by the surgeon. Limited information is available comparing different choices of PTS on the kinematics of the CR TKA, independent of the balancing of the extension gap. This study hypothesized that with the same balanced extension gap, the choice of PTS significantly impacts the intraoperatively measured kinematics of CR TKA. METHODS: Navigated CR TKAs were performed on seven fresh-frozen cadavers with healthy knees and intact posterior cruciate ligament (PCL)...
February 23, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29464372/long-term-results-of-total-knee-arthroplasty-after-failed-high-tibial-osteotomy
#19
Xavier Paredes-Carnero, Manuel Leyes, Francisco Forriol, Ana Belén Fernández-Cortiñas, Jesús Escobar, Javier G Babé
PURPOSE: Sometimes, total knee replacement (TKR) is performed after a tibial osteotomy. It is not known if the osteotomy influences the clinical process of a TKR. The aim of this study was to look at the clinical outcome of a TKR after high tibial osteotomy (HTO) compared to a TKR with no HTO. METHODS: Between 1995 and 2005, 41 post-HTO TKRs (group A) with a minimum follow-up of ten years were selected. In parallel, it was selected a control group undergoing simple TKR, consisting of 41 patients (group B) matched with group A...
February 20, 2018: International Orthopaedics
https://www.readbyqxmd.com/read/29457408/-double-plate-fixation-via-combined-approaches-for-the-treatment-of-old-tibial-plateau-fractures-of-schatzker-type-iv
#20
Hong-Lue Tan, Peng-Yi Dai, Wei-Feng Liu, Yan-Hao Yuan
OBJECTIVE: To explore the clinical efficacy of double-plate fixation for the treatment of old tibial plateau fractures with Schatzker type IV through anterior midline and posteromedial approaches. METHODS: From July 2013 to July 2015, 15 patients with old tibial plateau fractures were treated with internal fixation using locking reconstructive plate for the posteromedial fragment and anatomical locking plate for anteromedial fragment through antero midline and posteromedial approaches...
October 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
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