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Posterior cruciate ligament

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https://www.readbyqxmd.com/read/28213703/proximal-tibial-bony-and-meniscal-slopes-are-higher-in-acl-injured-subjects-than-controls-a-comparative-mri-study
#1
Ashraf Elmansori, Timothy Lording, Raphaël Dumas, Khalifa Elmajri, Philippe Neyret, Sébastien Lustig
PURPOSE: Increased tibial slope is reported as a risk factor of non-contact anterior cruciate ligament (ACL) injury, but the effect of the soft tissues on slope remains unclear. The primary aims of this study were to compare the tibial bony and soft tissue slopes between patients with and without ACL injury, and to investigate the relationship between the meniscal slopes (MS) and the tibial bony slope. Our hypothesis was that the menisci would correct the inclination of the bony tibial slope towards the horizontal...
February 17, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28210790/factors-influencing-the-success-of-anterior-cruciate-ligament-repair-with-dynamic-intraligamentary-stabilisation
#2
Anna M Krismer, Lampros Gousopoulos, Sandro Kohl, Atesch Ateschrang, Hendrik Kohlhof, Sufian S Ahmad
PURPOSE: Primary repair of the anterior cruciate ligament (ACL) has regained interest of clinicians with recent development of novel repair techniques. Dynamic intraligamentary stabilisation was introduced in an attempt to promote healing by shielding cyclic loads acting upon the ACL during the healing phase. The aim of this study was to identify negative factors likely to influence success of this procedure. METHODS: Between 2009 and 2014, 264 patients with an acute ACL rupture undergoing dynamic intraligamentary stabilisation were included in this study...
February 17, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28209274/long-term-durability-of-ceramic-tri-condylar-knee-implants-a-minimum-15-year-follow-up
#3
Shinichiro Nakamura, Hiromu Ito, Kenji Nakamura, Shinichi Kuriyama, Moritoshi Furu, Shuichi Matsuda
BACKGROUND: Ceramic bearings are not commonly used in total knee arthroplasty (TKA). So far, little information is available about whether long-term survivorship and good clinical outcomes can be ensured with ceramic knee implants. The purposes of the present study were to evaluate the clinical and radiological outcomes, and to assess the long-term durability of a ceramic tri-condylar implant. METHODS: A total of 507 consecutive TKAs were carried out using a ceramic tri-condylar femoral implant...
January 20, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28188335/posterior-cruciate-ligament-reconstruction-in-skeletal-immature-children
#4
Ole Gade Sørensen, Peter Faunø, Svend Erik Christiansen, Martin Lind
PURPOSE: Rupture of the posterior cruciate ligament (PCL) is a rare knee injury in children with open growth plates. The follow-up results of six patients with open physes treated with PCL reconstruction are presented. The objective is to evaluate the clinical outcomes of PCL reconstruction for six skeletally immature patients. METHODS: Between 2006 and 2010, six skeletally immature patients were treated with PCL reconstruction. At the time of surgery, the median age was 9 years (range 6-14)...
February 10, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28178094/reconstruction-of-symptomatic-congenital-anterior-cruciate-ligament-insufficiency
#5
Brant C Sachleben, Adam Y Nasreddine, Jeffrey J Nepple, Frances A Tepolt, James R Kasser, Mininder S Kocher
BACKGROUND: Hypoplasia or congenital absence of the anterior cruciate ligament (ACL) is a rare disorder occurring in ∼1 in every 6000 births. Although some patients with hypoplasia or agenesis of the ACL may not complain of instability, others desire to participate in more demanding activities that require the stability of a competent ACL. There are limited reports of surgical treatment of this patient population. The purpose of this study was to report ACL reconstruction in a case series of patients with symptomatic congenital ACL deficiency...
February 7, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28165760/comparison-of-acl-strain-in-the-mcl-deficient-and-mcl-reconstructed-knee-during-simulated-landing-in-a-cadaveric-model
#6
Eric J Mancini, Robert Kohen, Amanda O Esquivel, Allison M Cracchiolo, Stephen Edward Lemos
BACKGROUND: Noncontact anterior cruciate ligament (ACL) injury after valgus landing has been reported and studied biomechanically. However, the role of the medial collateral ligament (MCL) in dissipating these forces has not been fully elucidated. Purpose/Hypothesis: The purpose of this study was to investigate the role that the MCL plays in ACL strain during simulated landing. The hypothesis was that ACL strain would increase significantly in MCL-incompetent knees compared with the native knee and that reconstructing the MCL would return the values to those of the intact knee...
February 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28159678/experimental-validation-of-the-gnrb%C3%A2-for-measuring-anterior-tibial-translation
#7
Jean-Yves Jenny, Benjamin Puliero, Gilles Schockmel, Sébastien Harnoist, Philippe Clavert
INTRODUCTION: The objective of this study was to validate the technique used to measure anterior tibial translation in cadaver knees using the GNRB® device by comparing it with the gold standard, the OrthoPilot® navigation system. HYPOTHESIS: Simultaneous measurement of anterior tibial translation by the GNRB® and the OrthoPilot® in the chosen experimental conditions will result in significant differences between devices. MATERIAL AND METHODS: Five fresh frozen cadavers were used...
January 31, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28154811/closed-reduction-of-irreducible-posterolateral-knee-dislocation-a-case-report
#8
Satoshi Tateda, Atsushi Takahashi, Toshimi Aizawa, Jutaro Umehara
INTRODUCTION: Posterolateral rotary knee dislocation is a rare orthopedic injury that is considered to be irreducible by closed reduction because of soft tissue incarceration. Here, we present a case of posterolateral rotary knee dislocation, which was reduced by closed manipulation. CASE REPORT: The patientwas a 33-year-old man who sustained a twisting injury to his right knee that was diagnosed as posterolateral rotary knee dislocation by plain radiographs and the characteristic physical finding known as a dimple sign...
April 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28149714/all-anterior-approach-for-arthroscopic-posterior-cruciate-ligament-reconstruction-with-remnant-preservation
#9
Tianwu Chen, Shaohua Liu, Jiwu Chen
We describe the all-anterior approach for arthroscopic posterior cruciate ligament (PCL) reconstruction with remnant preservation. In this technique, PCL is reconstructed through 3 anterior portals: anterolateral portal, anteromedial portal, and inferior anterolateral portal, whereas the PCL remnant is preserved with great possibility. With the PCL elevator and wire catcher (Smith & Nephew), a self-made wire loop is introduced into the joint through the tibial tunnel, and is used to pass the graft in an all-inside-out fashion...
December 2016: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28142351/epidemiology-of-surgically-managed-anterior-cruciate-ligament-ruptures-in-a-sports-surgery-practice
#10
Andrew Arjun Sayampanathan, Bryan Koh Thean Howe, Hamid Rahmatullah Bin Abd Razak, Chong Hwei Chi, Andrew Hwee Chye Tan
INTRODUCTION: Anterior cruciate ligament (ACL) tears are common knee injuries, especially among sportsmen and sportswomen. The aim of this study is to better understand the epidemiology of surgically managed ACL tears sustained in our institution. METHODS: All patients who underwent arthroscopic ACL reconstruction by the senior author of this article in Singapore from 2008 to 2013 were studied. Patients who were diagnosed clinically and/or radiologically to have a complete tear of the ACL and subsequently underwent arthroscopic ACL reconstruction were included...
January 2017: Journal of Orthopaedic Surgery
https://www.readbyqxmd.com/read/28139332/validity-of-rotational-laxity-coupled-with-anterior-translation-of-the-knee-a-cadaveric-study-comparing-radiostereometry-and-the-rotab%C3%A2
#11
A Senioris, T Rousseau, M L'Hermette, S Gouzy, F Duparc, F Dujardin
BACKGROUND: In current practice, anterior cruciate ligament (ACL) tears can be diagnosed using several devices to measure anterior tibial translation and rotational knee laxity, but these measures are never collected together. The Rotab®, which yields simultaneous measurements of anterior tibial translation and passive lower limb rotation under stress, would therefore be advantageous in current practice, but its reliability has never been tested. AIM OF STUDY: To evaluate the accuracy and reliability of the Rotab® compared to the reference system, radiostereometric analysis (RSA)...
January 27, 2017: Knee
https://www.readbyqxmd.com/read/28132087/comparison-of-transtibial-and-retrograde-outside-in-techniques-of-anterior-cruciate-ligament-reconstruction-in-terms-of-graft-nature-and-clinical-outcomes-a-case-control-study-using-3t-mri
#12
Jin Hwan Ahn, Yong Seuk Lee, Hwa Jae Jeong, Jai Hyung Park, Yohan Cho, Kwang-Jeong Kim, Taeg Su Ko
INTRODUCTION: This study was performed to compare ACL graft maturation and morphologies using MRI between trans-tibial (TT) and retrograde outside-in (OI) techniques, and to compare clinical outcomes between the two groups. MATERIALS AND METHODS: Patients underwent single-tunnel ACL reconstruction using quadrupled hamstring autografts, with the TT technique used on 42 patients (TT group) and the retrograde OI technique used on 39 patients (OI group). All patients were examined with 3 T MRI at 6 months (between 5 and 7 months) after surgery...
January 28, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28117107/optimization-of-anteromedial-portal-femoral-tunnel-drilling-with-flexible-and-straight-reamers-in-anterior-cruciate-ligament-reconstruction-a%C3%A2-cadaveric-3-dimensional-computed-tomography%C3%A2-analysis
#13
Brian Forsythe, Michael J Collins, Thomas A Arns, William A Zuke, Michael Khair, Nikhil N Verma, Brian J Cole, Bernard R Bach, Nozomu Inoue
PURPOSE: To use 3-dimensional custom CAD technology to evaluate how knee flexion angle affects femoral tunnel length and distance to the posterior wall when using curved and straight guides for drilling through the anteromedial portal (AMP). METHODS: Six cadaveric knees were placed in an external fixator at various degrees of flexion (90°, 110°, 125°, and maximum 135° to 140°). Computed tomography scans were obtained at all flexion points for 3-dimensional point-cloud models...
January 20, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28108167/posterior-cruciate-retaining-versus-posterior-stabilized-total-knee-arthroplasty-for-osteoarthritis-with-severe-varus-deformity
#14
Ethem Ayhan Ünkar, Yusuf Öztürkmen, Erhan Şükür, Engin Çarkçı, Murat Mert
OBJECTIVE: The aim of this study was to compare the radiological and functional results of posterior cruciate ligament (PCL) - retaining and posterior-stabilized total knee arthroplasties in patients with severe varus gonarthrosis. METHODS: Medical records of 112 knees of 96 patients who underwent total knee arthroplasty for severe varus (≥15°) were reviewed. PCL-retaining and PCL-stabilizing groups consisted of 58 and 54 knees, respectively. Mean follow-up time was 56...
January 17, 2017: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/28093635/different-intraoperative-kinematics-stability-and-range-of-motion-between-cruciate-substituting-ultracongruent-and-posterior-stabilized-total-knee-arthroplasty
#15
Hagen Fritzsche, Franziska Beyer, Anne Postler, Jörg Lützner
PURPOSE: The aim of this study was the comparison of intraoperative kinematics, stability, and range of motion (ROM) between the native osteoarthritic knee and cruciate-substituting fixed-bearing total knee arthroplasty (TKA) using both an ultracongruent (UC) and a posterior-stabilized (PS) insert design in the same patient. We hypothesized less knee flexion and less antero-posterior stability in the UC TKA. METHODS: Intraoperative measurements of kinematics, stability, and ROM were performed in 40 patients before soft-tissue release and bone cuts, and after implantation of the final femoral and tibial implants with both a UC insert and a PS insert...
January 16, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28090443/topographical-and-depth-dependent-glycosaminoglycan-concentration-in-canine-medial-tibial-cartilage-3-weeks-after-anterior-cruciate-ligament-transection-surgery-a-microscopic-imaging-study
#16
Daniel Mittelstaedt, David Kahn, Yang Xia
BACKGROUND: Medical imaging has become an invaluable tool to diagnose damage to cartilage. Depletion of glycosaminoglycans (GAG) has been shown to be one of the early signs of cartilage degradation. In order to investigate the topographical changes in GAG concentration caused by the anterior cruciate ligament transection (ACLT) surgery in a canine model, microscopic magnetic resonance imaging (µMRI) and microscopic computed tomography (µCT) were used to measure the GAG concentration with correlation from a biochemical assay, inductively coupled plasma optical emission spectroscopy (ICP-OES), to understand where the topographical and depth-dependent changes in the GAG concentration occur...
December 2016: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28090441/principal-component-analysis-t1%C3%AF-voxel-based-relaxometry-of-the-articular-cartilage-a-comparison-of-biochemical-patterns-in-osteoarthritis-and-anterior-cruciate-ligament-subjects
#17
Valentina Pedoia, Colin Russell, Allison Randolph, Xiaojuan Li, Sharmila Majumdar
BACKGROUND: Quantitative MR, including T1ρ mapping, has been extensively used to probe early biochemical changes in knee articular cartilage of subjects with osteoarthritis (OA) and others at risk for cartilage degeneration, such as those with anterior cruciate ligament (ACL) injury and reconstruction. However, limited studies have been performed aimed to assess the spatial location and patterns of T1ρ. In this study we used a novel voxel-based relaxometry (VBR) technique coupled with principal component analysis (PCA) to extract relevant features so as to describe regional patterns and to investigate their similarities and differences in T1ρ maps in subjects with OA and subjects six months after ACL reconstruction (ACLR)...
December 2016: Quantitative Imaging in Medicine and Surgery
https://www.readbyqxmd.com/read/28089795/comparison-of-postoperative-biomechanical-function-between-anatomic-double-bundle-and-single-bundle-acl-reconstructions-using-calcium-phosphate-hybridized-tendon-grafts-in-goats
#18
Hirotaka Mutsuzaki, Hiromichi Fujie, Hiromi Nakajima, Makoto Fukagawa, Shunsuke Nomura, Masataka Sakane
BACKGROUND: Calcium phosphate (CaP)-hybridized tendon grafts improved biomechanical function compared with untreated grafts after single-bundle (SB) anterior cruciate ligament (ACL) reconstruction.The purpose of this study was to compare the biomechanical functionbetweenanatomic double-bundle (DB)and single-bundle (SB)ACL reconstructions using CaP-hybridized tendon grafts at 6 months postoperativelyin goats. HYPOTHESIS: We hypothesized that the postoperativebiomechanicalfunctioninthe DBgroupwill bebetterthan that inthe SB group...
January 9, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28089224/loading-of-the-medial-meniscus-in-the-acl-deficient-knee-a-multibody-computational-study
#19
Trent M Guess, Swithin Razu
The menisci of the knee reduce tibiofemoral contact pressures and aid in knee lubrication and nourishment. Meniscal injury occurs in half of knees sustaining anterior cruciate ligament injury and the vast majority of tears in the medial meniscus transpire in the posterior horn region. In this study, computational multibody models of the knee were derived from medical images and passive leg motion for two female subjects. The models were validated against experimental measures available in the literature and then used to evaluate medial meniscus contact force and internal hoop tension...
January 11, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28077395/the-effects-of-posterior-cruciate-ligament-deficiency-on-posterolateral-corner-structures-under-gait-and-squat-loading-conditions-a-computational-knee-model
#20
K-T Kang, Y-G Koh, M Jung, J-H Nam, J Son, Y H Lee, S-J Kim, S-H Kim
OBJECTIVES: The aim of the current study was to analyse the effects of posterior cruciate ligament (PCL) deficiency on forces of the posterolateral corner structure and on tibiofemoral (TF) and patellofemoral (PF) contact force under dynamic-loading conditions. METHODS: A subject-specific knee model was validated using a passive flexion experiment, electromyography data, muscle activation, and previous experimental studies. The simulation was performed on the musculoskeletal models with and without PCL deficiency using a novel force-dependent kinematics method under gait- and squat-loading conditions, followed by probabilistic analysis for material uncertain to be considered...
January 2017: Bone & Joint Research
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