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https://www.readbyqxmd.com/read/29436742/biomechanical-influence-of-deficient-posterolateral-corner-structures-on-knee-joint-kinematics-a-computational-study
#1
Kyoung-Tak Kang, Yong-Gon Koh, Juhyun Son, Moonki Jung, Sangyun Oh, Sung-Jae Kim, Sung-Hwan Kim
The posterolateral corner (PLC) structures including the popliteofibular ligament (PFL), popliteus tendon (PT) and lateral collateral ligament (LCL) are important soft tissues for posterior translational, external rotational and varus angulation knee joint instabilities. The purpose of this study was to determine the effects of deficient PLC structures on the kinematics of the knee joint under gait and squat loading conditions. We developed subject-specific computational models with full 12-degree-of-freedom tibiofemoral and patellofemoral joints for four male subjects and one female subject...
February 13, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29356799/rim-plate-augmentation-of-the-posterolateral-bare-area-of-the-tibial-plateau-using-a-3-5-mm-pre-contoured-locking-compression-plate-a-cadaveric-study
#2
Youngwoo Kim, Yong-Cheol Yoon, Jae-Woo Cho, Won-Tae Cho, Neung-Han Jeon, Chang-Wug Oh, Jong-Keon Oh
OBJECTIVE: To evaluate the effectiveness of an additional rim plate (3.5-mm pre-contoured locking compression plate) for stabilizing the posterolateral fragment in lateral tibial plateau fractures. METHODS: Standard lateral locking plates (either a PTP or PTLP) followed by the application of a secondary rim plate (VALCP) posterior laterally were applied to 40 matched pair knees from 20 fresh-frozen cadavers. RESULTS: The mean ratio of supported articular surface in the PTP group was 0...
January 5, 2018: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/29320786/imaging-of-ligamentous-structures-within-the-knee-includes-much-more-than-the-acl
#3
Kara Gaetke-Udager, Corrie M Yablon
Ligamentous structures of the knee are numerous and complex, including the anterior and posterior cruciate ligaments, medial and lateral collateral ligaments, ligaments of the posteromedial and posterolateral corners, and the anterolateral ligament. Clinical assessment after a knee injury is paramount and can direct both the clinician's choice of imaging study and the radiologist's interpretation. Imaging is crucial in that it provides additional information for diagnosis, management, and surgical planning...
January 10, 2018: Journal of Knee Surgery
https://www.readbyqxmd.com/read/29125242/external-female-genitalia-of-six-species-of-the-genus-meccus-hemiptera-reduviidae-triatominae
#4
Nancy Rivas, Victor Sánchez-Cordero, Alejandro D Camacho, Ricardo Alejandre-Aguilar
Triatomine classification is based on morphological characteristics. Studies have been conducted to improve their identification by observing many characteristics. However, there are problems of differentiating among highly interrelated species and new criteria are required. The purpose of this study was to determine the morphological differences in the external female genitalia of M. pallidipennis, M. longipennis, M. picturatus, M. bassolsae, M. mazzottii, and M. phyllosomus in order to distinguish among species using scanning electron microscopy...
December 2017: Journal of Vector Ecology: Journal of the Society for Vector Ecology
https://www.readbyqxmd.com/read/29111197/the-critical-acromial-point-the-anatomic-location-of-the-lateral-acromion-in-the-critical-shoulder-angle
#5
Michael R Karns, Matthijs Jacxsens, William J Uffmann, Dane C Todd, Heath B Henninger, Robert T Burks
BACKGROUND: Acromioplasty has been proposed as a means of altering elevated critical shoulder angles (CSAs). We aimed to localize the critical acromion point (CAP) responsible for the acromial contribution of the CSA and determine whether resection of the CAP can alter the CSA to a normal range. METHODS: The CAP and 3-dimensional (3D) CSAs were determined on 3D computed tomography reconstructions of 88 cadaveric shoulders and compared with corresponding CSAs on digitally reconstructed radiographs...
October 27, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29099891/paraskiing-crash-and-knee-dislocation-with-multiligament-reconstruction-and-iliotibial-band-repair
#6
Chase S Dean, Olivia Fernandes, Mark E Cinque, Jorge Chahla, Robert F LaPrade
We describe the diagnosis, treatment, rehabilitation, and complications of a 27-year-old male paraskiier who sustained a closed high-velocity knee dislocation after colliding with a tree at a speed of 45 mph and falling 40 feet to the ground. Extensive surgery to repair and reconstruct the knee included open lateral capsular repair, open anatomical posterolateral corner reconstruction with split Achilles tendon allograft, open iliotibial band reconstruction with Achilles tendon allograft, arthroscopic anterior cruciate ligament reconstruction with bone-patellar tendon-bone autograft, and double-bundle posterior cruciate ligament reconstruction with Achilles tendon allograft for the anterolateral bundle and tibialis anterior tendon allograft for the posteromedial bundle...
September 2017: American Journal of Orthopedics
https://www.readbyqxmd.com/read/28856482/hyperextension-injuries-of-the-knee-do-patterns-of-bone-bruising-predict-soft-tissue-injury
#7
A M Ali, J K Pillai, V Gulati, C E R Gibbons, B J Roberton
OBJECTIVE: To establish whether patterns of soft tissue injury following knee hyperextension are associated with post-traumatic 'bone bruise' distribution. MATERIALS AND METHODS: Patients with a knee MRI within one year of hyperextension injury were identified at our institution over a 7 year period. MRIs, plain radiographs and clinical details of these patients were reviewed. RESULTS: Twenty-five patients were identified (median time from injury to MRI = 24 days)...
August 31, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28615108/kinematics-of-different-components-of-the-posterolateral-corner-of-the-knee-in-the-lateral-collateral-ligament-intact-state-a-human-cadaveric%C3%A2-study
#8
Christoph Domnick, Karl-Heinz Frosch, Michael J Raschke, Nils Vogel, Martin Schulze, Mathias von Glahn, Tobias C Drenck, Mirco Herbort
PURPOSE: To determine the static stabilizing effects of different anatomical structures of the posterolateral corner (PLC) of the knee in the lateral collateral ligament (LCL)-intact state. METHODS: Thirteen fresh-frozen human cadaveric knees were dissected and tested using an industrial robot with an optical tracking system. Kinematics were determined for 134 N anterior/posterior loads, 10 N m valgus/varus loads, and 5 N m internal/external rotatory loads in 0°, 20°, 30°, 60°, and 90° of knee flexion...
October 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28607939/the-role-of-the-peripheral-passive-rotation-stabilizers-of-the-knee-with-intact-collateral-and-cruciate-ligaments-a-biomechanical-study
#9
Alexander R Vap, Jason M Schon, Gilbert Moatshe, Raphael S Cruz, Alex W Brady, Grant J Dornan, Travis Lee Turnbull, Robert F LaPrade
BACKGROUND: A subset of patients have clinical internal and/or external knee rotational instability despite no apparent injury to the cruciate or collateral ligaments. PURPOSE/HYPOTHESIS: The purpose of this study was to assess the effect of sequentially cutting the posterolateral, anterolateral, posteromedial, and anteromedial structures of the knee on rotational stability in the setting of intact cruciate and collateral ligaments. It was hypothesized that cutting of the iliotibial band (ITB), anterolateral ligament and lateral capsule (ALL/LC), posterior oblique ligament (POL), and posteromedial capsule (PMC) would significantly increase internal rotation, while sectioning of the anteromedial capsule (AMC) and the popliteus tendon and popliteofibular ligament (PLT/PFL) would lead to a significant increase in external knee rotation...
May 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28597687/comparison-of-calcaneal-exposure-through-the-extensile-lateral-and-sinus-tarsi-approaches
#10
Katherine M Bedigrew, James A Blair, Daniel R Possley, Kevin L Kirk, Joseph R Hsu
The purpose of this study was to compare the exposure of the posterior facet with the extensile lateral (EL) approach compared with the sinus tarsi (ST) approach. We hypothesized that the ST approach will provide a similar exposure of the posterior calcaneal facet. A total of 8 sequential ST then EL approaches were performed on cadavers. Calcaneal landmarks were identified by visualization or palpation. Calibrated digital photographs of the posterior facet and lateral calcaneal body were obtained from standardized positions and used to calculate the exposed surface area...
June 1, 2017: Foot & Ankle Specialist
https://www.readbyqxmd.com/read/28580244/arthroscopic-technique-for-isolated-posterolateral-rotational-instability-of-the-knee
#11
Yasuo Ohnishi, Cecilia Pascual-Garrido, Hiroto Kumagae, Akinori Sakai, Soshi Uchida
Isolated posterolateral corner injury is an uncommon injury that could be a source of unexplained knee pain and dysfunction. Most of these patients present instability caused by concomitant ligament injuries. Numerous studies have shown open approach posterolateral repair or reconstruction surgeries to restore posterolateral rotational stability. Still, there is a certain population of patients who present posterolateral rotation instability without significant injury to the fibular collateral ligament, popliteal fibular ligament, and popliteus tendon...
April 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28536855/rotational-laxity-control-by-the-anterolateral-ligament-and-the-lateral-meniscus-is-dependent-on-knee-flexion-angle-a-cadaveric-biomechanical-study
#12
Timothy Lording, Gillian Corbo, Dianne Bryant, Timothy A Burkhart, Alan Getgood
BACKGROUND: Injury to the anterolateral ligament (ALL) has been reported to contribute to high-grade anterolateral laxity after anterior cruciate ligament (ACL) injury. Failure to address ALL injury has been suggested as a cause of persistent rotational laxity after ACL reconstruction. Lateral meniscus posterior root (LMPR) tears have also been shown to cause increased internal rotation of the knee. QUESTIONS/PURPOSES: The purpose of this study was to determine the functional relationship between the ALL and LMPR in the control of internal rotation of the ACL-deficient knee...
October 2017: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/28451605/the-impact-of-osseous-malalignment-and-realignment-procedures-in-knee-ligament-surgery-a-systematic-review-of-the-clinical-evidence
#13
REVIEW
Thomas Tischer, Jochen Paul, Dietrich Pape, Michael T Hirschmann, Andreas B Imhoff, Stefan Hinterwimmer, Matthias J Feucht
BACKGROUND: Failure rates of knee ligament surgery may be high, and the impact of osseous alignment on surgical outcome remains controversial. Basic science studies have demonstrated that osseous malalignment can negatively affect ligament strain and that realignment procedures may improve knee joint stability. HYPOTHESIS/PURPOSE: The purpose of this review was to summarize the clinical evidence concerning the impact of osseous malalignment and realignment procedures in knee ligament surgery...
March 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/28447141/the-iliotibial-band-and-anterolateral-capsule-have-a-combined-attachment-to-the-segond-fracture
#14
Marcio Albers, Humza Shaikh, Elmar Herbst, Kentaro Onishi, Kanto Nagai, Volker Musahl, Freddie H Fu
The purpose of this report was to describe the injury mechanism, surgical findings, and outcomes in a 21-year-old professional female football player who presented with a complete anterior cruciate ligament (ACL) rupture and Segond fracture. Interview and video analysis were performed to elicit the injury mechanism. Clinical examination and imaging revealed a complete ACL tear, Segond fracture, lateral meniscus tear, MCL sprain, and posterolateral corner sprain. Examination under anaesthesia revealed Grade 2 pivot shift and varus/valgus instability...
April 26, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28361277/the-effect-of-a-dynamic-pcl-brace-on-patellofemoral-compartment-pressures-in-pcl-and-pcl-plc-deficient-knees
#15
Tyler Welch, Thomas Keller, Ruben Maldonado, Melodie Metzger, Karen Mohr, Ronald Kvitne
BACKGROUND: The natural history of posterior cruciate ligament (PCL) deficiency includes the development of arthrosis in the patellofemoral joint (PFJ). The purpose of this biomechanical study was to evaluate the hypothesis that dynamic bracing reduces PFJ pressures in PCL- and combined PCL/posterolateral corner (PLC)-deficient knees. STUDY DESIGN: Controlled Laboratory Study. METHODS: Eight fresh frozen cadaveric knees with intact cruciate and collateral ligaments were included...
December 2017: Journal of Experimental Orthopaedics
https://www.readbyqxmd.com/read/28335461/design-and-validation-of-a-low-cost-portable-device-to-quantify-postural-stability
#16
Yong Zhu
Measurement of the displacement of the center-of-pressure (COP) is an important tool used in biomechanics to assess postural stability and human balance. The goal of this research was to design and validate a low-cost portable device that can offer a quick indication of the state of postural stability and human balance related conditions. Approximate entropy (ApEn) values reflecting the amount of irregularity hiding in COP oscillations were used to calculate the index. The prototype adopted a portable design using the measurements of the load cells located at the four corners of a low-cost force platform...
March 18, 2017: Sensors
https://www.readbyqxmd.com/read/28224067/repair-of-rotator-cuff-tear-with-delamination-independent-repairs-of-the-infraspinatus-and-articular-capsule
#17
Tomoyuki Mochizuki, Akimoto Nimura, Takashi Miyamoto, Hideyuki Koga, Keiichi Akita, Takeshi Muneta
We propose a technique to repair delamination, which often occurs during rotator cuff repair surgery. We have reported that the infraspinatus occupies most of the greater tuberosity with the articular capsule attached to a very wide area, and that the superficial layer is mainly composed of the infraspinatus, and the deep layer is mainly composed of the articular capsule. To repair such delamination with consideration of the detailed anatomy, we developed the following repair method with independent repair of the superficial layer (infraspinatus) and the deep layer (articular capsule): (1) the deep layer is pulled laterally and joined to the medial margin of the greater tuberosity using 4 simple sutures from 2 anchors; (2) the paired limbs (same color) of 4 knots are passed over the posterior leaf of the superficial layer at intervals; (3) a push-in anchor loaded with 1 thread each of 4 knots is placed on the anterolateral corner of the greater tuberosity to pull the superficial layer anterolaterally; (4) another push-in anchor (remaining threads) is pushed on the posterior corner of the greater tuberosity...
October 2016: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28183110/a-new-species-of-i-lucasioides-i-kwon-isopoda-oniscidea-agnaridae-from-china
#18
Weichun Li
Lucasioides nudus sp. n. is described from Jiangxi Province, China. The new species can be diagnosed by the cephalon having a well-developed median lobe, the pereonite 1 with acutely postero-lateral corners and sinuous posterior margin of epimeron, the male pleopod 1 endopod without setules, and the bilobed exopod with the outer lobe much shorter and broader than the acute triangular inner lobe.
January 10, 2017: Zootaxa
https://www.readbyqxmd.com/read/28116264/failure-of-polyethelene-insert-locking-mechanism-after-a-posterior-stabilised-total-knee-arthroplasty-a-case-report
#19
Gurava Reddy Ay, Soundar Rajan D, Chiranjeevi T, Karthik C, Krishna Kiran E
INTRODUCTION: Disengagement of polyethylene insert used in total knee arthroplasty is a rare but serious complication. Still rarer is disengagement because of failure of tibial insert locking mechanism. We report a previously unpublished complication of polyethylene insert locking mechanism failure in a 10-months-old posterior stabilized total knee arthroplasty in a 70-year-old woman with osteoarthritis for whom Attune (Depuy) knee implant was used. CASE PRESENTATION: A 70-year-old female underwent (Attune, Depuy) primary bilateral posterior stabilised total knee arthroplasty in a private hospital...
July 2016: Journal of Orthopaedic Case Reports
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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