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https://www.readbyqxmd.com/read/29052744/tibiofemoral-joint-congruence-is-lower-in-females-with-acl-injuries-than-males-with-acl-injuries
#1
Antoine Schneider, Salim Si-Mohamed, Robert A Magnussen, Sebastien Lustig, Philippe Neyret, Elvire Servien
PURPOSE: Previous research has demonstrated that women have a higher risk of anterior cruciate ligament (ACL) injury than men. Tibiofemoral articular geometry may play a role in the occurrence of ACL tears. The purpose of this study was to analyze the gender-specific geometric characteristics differences in tibiofemoral morphology in ACL-deficient patients. METHODS: Medial tibial slope (MTS), lateral tibial slope (LTS), medial tibial plateau concavity, medial and lateral femoral condyle convexity, and lateral plateau convexity were analyzed in 276 patients with complete ACL injuries (138 females and 138 males)...
October 20, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29046045/comparative-study-of-clinical-and-radiographic-outcomes-of-high-tibial-osteotomy-in-patients-with-kissing-lesions-and-non-kissing-lesions
#2
Oog-Jin Shon, Sang-Jin Park, Bum-Jin Shim, Dong-Yeol Lee
Purpose: High Outerbridge grade lesions of the articular cartilage have been associated with poor outcomes of high tibial osteotomy (HTO). However, there has been no report on the efficacy of HTO in the presence of kissing lesions. The purpose of this study was to compare clinical and radiographic outcomes of HTO between kissing lesion and non-kissing lesion groups. Materials and Methods: Of the patients with medial compartment osteoarthritis and varus deformity treated with HTO between 2007 and 2012, 21 cases with kissing lesions and 22 cases without kissing lesions were selected...
October 19, 2017: Knee Surgery & related Research
https://www.readbyqxmd.com/read/29033262/primary-stability-of-different-plate-positions-and-the-role-of-bone-substitute-in-open-wedge-high-tibial-osteotomy
#3
Ryohei Takeuchi, Jung Woon-Hwa, Hiroyuki Ishikawa, Yuichiro Yamaguchi, Katsunari Osawa, Yasushi Akamatsu, Koichi Kuroda
BACKGROUND: The purpose of this study was to compare the mechanical fixation strengths of anteromedial and medial plate positions in osteotomy, and clarify the effects of bone substitute placement into the osteotomy site. METHODS: Twenty-eight sawbone tibia models were used. Four different models were prepared: Group A, the osteotomy site was open and the plate position was anteromedial; Group B, bone substitutes were inserted into the osteotomy site and the plate position was anteromedial; Group C, the osteotomy site was open and the plate position was medial; and Group D, bone substitutes were inserted into the osteotomy site and the plate position was medial...
October 12, 2017: Knee
https://www.readbyqxmd.com/read/29017801/influence-of-increased-posterior-tibial-slope-in-total-knee-arthroplasty-on-knee-joint-biomechanics-a-computational-simulation-study
#4
Kyoung-Tak Kang, Yong-Gon Koh, Juhyun Son, Oh-Ryong Kwon, Jun-Sang Lee, Sae-Kwang Kwon
BACKGROUND: The reconstructed posterior tibial slope (PTS) plays a significant role in restoring knee kinematics in cruciate-retaining-total knee arthroplasty (TKA). A few studies have reported the effect of the PTS on biomechanics. METHODS: This study investigates the effect of the PTS on tibiofemoral (TF) kinematics, patellofemoral (PF) contact stress, and forces at the quadriceps, posterior cruciate ligament (PCL) and collateral ligament after cruciate-retaining-TKA using computer simulations...
September 21, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28989265/technical-considerations-in-revision-anterior-cruciate-ligament-acl-reconstruction-for-operative-techniques-in-orthopaedics
#5
Jeremy M Burnham, Elmar Herbst, Thierry Pauyo, Thomas Pfeiffer, Darren L Johnson, Freddie H Fu, Volker Musahl
As the incidence of anterior cruciate ligament (ACL) reconstruction continues to increase, the rate of revision surgery continues to climb. Revision surgery has inherent challenges that must be addressed in order to achieve successful results. The cause of the primary ACL reconstruction failure should be determined, and careful preoperative planning should be performed to address the cause(s) of failure. Each patient undergoing revision surgery should undergo a thorough history and physical examination, receive full length alignment radiographs, lateral radiographs, 45-degree flexion weight-bearing postero-anterior radiographs, and patellofemoral radiographs...
March 2017: Operative Techniques in Orthopaedics
https://www.readbyqxmd.com/read/28970127/relationships-of-hamstring-muscle-volumes-to-lateral-tibial-slope
#6
Randy J Schmitz, Anthony S Kulas, Sandra J Shultz, Justin P Waxman, Hsin-Min Wang, Robert A Kraft
BACKGROUND: Greater posterior-inferior directed slope of the lateral tibial plateau (LTS) has been demonstrated to be a prospective ACL injury risk factor. Trainable measures to overcome a greater LTS need to be identified for optimizing injury prevention protocols. It was hypothesized that Healthy individuals with greater LTS who have not sustained an ACL injury would have a larger lateral hamstring volume. METHODS: Eleven healthy females (mean +/- standard deviation) (1...
September 29, 2017: Knee
https://www.readbyqxmd.com/read/28966378/patella-height-changes-post-high-tibial-osteotomy
#7
Siew Ghim Gooi, Chloe Xiao Yun Chan, Melvin Kian Loong Tan, Andrew Kean Seng Lim, Kandiah Satkunanantham, James Hoi Po Hui
BACKGROUND: Medial opening wedge high tibial osteotomy (HTO) is a well-described treatment in early medial compartmental osteoarthritis of the knee. However, two undesirable sequelae may follow -patella baja and changes in the posterior tibial slope (TS). MATERIALS AND METHODS: We conducted a retrospective study in patients who underwent HTO in our center between September 2009 and February 2017. Preoperative and 6-week postoperative long-leg weight bearing films and lateral knee radiographs were assessed...
September 2017: Indian Journal of Orthopaedics
https://www.readbyqxmd.com/read/28953661/comparison-of-kinematic-and-mechanical-alignment-techniques-in-primary-total-knee-arthroplasty-a-meta-analysis
#8
Jung-Ro Yoon, Seung-Beom Han, Min-Kyo Jee, Young-Soo Shin
BACKGROUND: This meta-analysis compared clinical and radiographic outcomes and complications of kinematic alignment (KA) and mechanical alignment (MA) techniques in primary total knee arthroplasty (TKA). METHODS: All studies comparing the operation time, change in hemoglobin, length of hospital stay, postoperative complications, and clinical and radiographic outcomes as assessed with various measurement tools, from direct interview to imaging methods, in patients who underwent primary TKA through the KA or MA technique were included...
September 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28952547/automated-measurement-of-patient-specific-tibial-slopes-from-mri
#9
Amirhesam Amerinatanzi, Rodney K Summers, Kaveh Ahmadi, Vijay K Goel, Timothy E Hewett, Edward Nyman
BACKGROUND: Multi-planar proximal tibial slopes may be associated with increased likelihood of osteoarthritis and anterior cruciate ligament injury, due in part to their role in checking the anterior-posterior stability of the knee. Established methods suffer repeatability limitations and lack computational efficiency for intuitive clinical adoption. The aims of this study were to develop a novel automated approach and to compare the repeatability and computational efficiency of the approach against previously established methods...
August 8, 2017: Bioengineering
https://www.readbyqxmd.com/read/28943039/three-dimensional-analysis-of-accuracy-of-component-positioning-in-total-knee-arthroplasty-with-patient-specific-and-conventional-instruments-a-randomized-controlled-trial
#10
Raf De Vloo, Pim Pellikaan, Aad Dhollander, Jos Vander Sloten
BACKGROUND: Component malalignment remains a major concern in total knee arthroplasty (TKA). Patient-specific guides (PSG) were developed to increase accuracy of bone resections and component placement, but available evidence is contradictory. We assessed the accuracy of 3D component placement in TKA with PSG compared to conventional surgery using virtual 3D bone models. METHODS: Fifty patients were randomly assigned to the PSG or conventional instrumentation group, 44 were finally analyzed...
September 21, 2017: Knee
https://www.readbyqxmd.com/read/28940016/bi-cruciate-stabilized-total-knee-arthroplasty-can-reduce-the-risk-of-knee-instability-associated-with-posterior-tibial-slope
#11
Masaru Hada, Hideki Mizu-Uchi, Ken Okazaki, Takao Kaneko, Koji Murakami, Yuan Ma, Satoshi Hamai, Yasuharu Nakashima
PURPOSE: The purpose of this study was to evaluate the relationship between posterior tibial slope and knee kinematics in bi-cruciate stabilized (BCS) total knee arthroplasty (TKA), which has not been previously reported. METHODS: This computer simulation study evaluated Journey 2 BCS components (Smith & Nephew, Inc., Memphis, TN, USA) implanted in a female patient to simulate weight-bearing stair climbing. Knee kinematics, patellofemoral contact forces, and quadriceps forces during stair climbing (from 86° to 6° of flexion) were computed in the simulation...
September 22, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28914139/the-influence-of-geometric-design-variables-on-the-kinematic-performance-of-a-surface-guided-total-knee-replacement
#12
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/28893426/outcomes-after-double-bundle-anterior-cruciate-ligament-reconstruction
#13
Ji Hyun Ahn, Ho Won Kang, Kug Jin Choi
PURPOSE: To identify the risk factors predicting unsatisfactory postoperative clinical outcomes after double-bundle (DB) anterior cruciate ligament (ACL) reconstruction using multivariate logistic regression. METHODS: Inclusion criteria were consecutive DB ACL reconstructions from January 2006 to September 2012 with a minimum 3-year follow-up. Exclusion criteria included (1) a delay to surgery from initial injury of more than 4 years (210 weeks); (2) contralateral knee pathology; (3) the lack of postoperative 3-dimensional computed tomography; (4) single-bundle ACL reconstruction; (5) revision ACL reconstruction; (6) meniscus allograft transplantation after total or subtotal meniscectomy; (7) multiple ligament surgeries...
September 8, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28889191/high-tibial-slope-correlates-with-increased-posterior-tibial-translation-in-healthy-knees
#14
Imke Schatka, Andreas Weiler, Tobias M Jung, Thula C Walter, Clemens Gwinner
PURPOSE: Notwithstanding the importance of the tibial slope (TS) for anterior tibial translation, little information is available regarding the implications on posterior laxity, particularly in healthy subjects. It was hypothesized that increased TS is associated with decreased posterior tibial translation (PTT) in healthy knees. METHODS: A total of 124 stress radiographs of healthy knees were enrolled in this study. Tibial slope and the posterior tibial translation were evaluated using a Telos device with a 150-N force at 90° of knee flexion...
September 9, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28888524/total-knee-arthroplasty-after-opening-%C3%A2-versus-closing-wedge-high-tibial-osteotomy-a-135-case-series-with-minimum-5-year-follow-up
#15
M Ehlinger, A D'Ambrosio, P Vie, S Leclerc, F Bonnomet, P Bonnevialle, S Lustig, S Parratte, M Colmar, J-N Argenson
INTRODUCTION: High tibial osteotomy (HTO) is effective in treating isolated medial osteoarthritis of the knee, but subsequent deterioration is inevitable, and total knee arthroplasty (TKA) is then an option. The present study sought to compare TKA following medial opening-wedge HTO (OW-HTO) versus lateral closing-wedge HTO (CW-HTO) in terms of intraoperative data and clinical results. The study hypothesis was that there is no significant difference in clinical results or complications in TKA following OW-HTO or CW-HTO...
September 6, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28874272/postcrania-of-the-most-primitive-euprimate-and-implications-for-primate-origins
#16
Doug M Boyer, Séverine Toussaint, Marc Godinot
The fossil record of early primates is largely comprised of dentitions. While teeth can indicate phylogenetic relationships and dietary preferences, they say little about hypotheses pertaining to the positional behavior or substrate preference of the ancestral crown primate. Here we report the discovery of a talus bone of the dentally primitive fossil euprimate Donrussellia provincialis. Our comparisons and analyses indicate that this talus is more primitive than that of other euprimates. It lacks features exclusive to strepsirrhines, like a large medial tibial facet and a sloping fibular facet...
October 2017: Journal of Human Evolution
https://www.readbyqxmd.com/read/28855192/the-effect-of-implant-position-on-bone-strain-following-lateral-unicompartmental-knee-arthroplasty-a-biomechanical-model-using-digital-image-correlation
#17
A M Ali, S D S Newman, P A Hooper, C M Davies, J P Cobb
OBJECTIVES: Unicompartmental knee arthroplasty (UKA) is a demanding procedure, with tibial component subsidence or pain from high tibial strain being potential causes of revision. The optimal position in terms of load transfer has not been documented for lateral UKA. Our aim was to determine the effect of tibial component position on proximal tibial strain. METHODS: A total of 16 composite tibias were implanted with an Oxford Domed Lateral Partial Knee implant using cutting guides to define tibial slope and resection depth...
August 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/28852353/management-of-painful-patellar-clunk-and-crepitance-results-at-a-mean-follow-up-of-five-years
#18
J Joseph Gholson, Devon D Goetz, Robert W Westermann, John Hart, John J Callaghan
INTRODUCTION: Painful patellar clunk and crepitance (PCC) is a known complication of total knee arthroplasty (TKA) with posterior-stabilized designs. Arthroscopic management of PCC has been proposed as a treatment option for PCC. METHODS: We reviewed all cases of PCC from a consecutive single-surgeon series using a specific posterior stabilized (PS) design treated with arthroscopy for PCC. In a series of 1,488 TKA cases, forty-six patients (3.1%) were identified to have clinical signs and symptoms of PCC during post-operative clinic follow-up...
2017: Iowa Orthopaedic Journal
https://www.readbyqxmd.com/read/28840124/the-effect-of-patient-specific-instrumentation-incorporating-an-extramedullary-tibial-guide-on-operative-efficiency-for-total-knee-arthroplasty
#19
Oh-Ryong Kwon, Kyoung-Tak Kang, Juhyun Son, Dong-Suk Suh, Dong Beom Heo, Yong-Gon Koh
This retrospective study was to determine if patient-specific instrumentation (PSI) for total knee arthroplasty (TKA) leads to shortened surgical time through increased operating room efficiency according to different tibial PSI designs. 166 patients underwent primary TKA and were categorized into three groups as follows: PSI without extramedullary (EM) tibial guide (group 1, n = 48), PSI with EM tibial guide (group 2, n = 68), and conventional instrumentation (CI) group (group 3, n = 50). Four factors were compared between groups, namely, operative room time, thickness of bone resection, tibial slope, and rotation of the component...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28831554/the-impact-of-patient-specific-instrumentation-on-unicompartmental-knee-arthroplasty-a-prospective-randomised-controlled-study
#20
Abtin Alvand, Tanvir Khan, Cathy Jenkins, Jonathan L Rees, William F Jackson, Christopher A F Dodd, David W Murray, Andrew J Price
PURPOSE: Patient-specific instrumentation (PSI) has been proposed as a means of improving surgical accuracy and ease of implantation during technically challenging procedures such as unicompartmental knee arthroplasty (UKA). The purpose of this prospective randomised controlled trial was to compare the accuracy of implantation and functional outcome of mobile-bearing medial UKAs implanted with and without PSI by experienced UKA surgeons. METHODS: Mobile-bearing medial UKAs were implanted in 43 patients using either PSI guides or conventional instrumentation...
August 22, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
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