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https://www.readbyqxmd.com/read/29352626/differences-between-sexes-in-the-standard-and-advanced-dimensioning-of-lateral-meniscal-allografts
#1
Patrycja Mickiewicz, Michał Walczak, Michał Łaszczyca, Damian Kusz, Zygmunt Wróbel
BACKGROUND: There are many different methods of meniscal allograft measurements, which depend on individual tissue bank procedures. Due to the lack of a standardised method of dimensioning, measurement results may vary between individual cases. Consequently, allograft may be mismatched to the patient's knee anatomy. The purpose of this study was to measure four meniscal dimensions - two standard and two specific - and then compare them between sexes. METHODS: Fourteen cadaveric lateral menisci (seven male and seven female) were scanned using a microtomography scanner...
January 15, 2018: Knee
https://www.readbyqxmd.com/read/29352333/long-term-results-of-custom-cementless-stem-total-hip-arthroplasty-performed-in-hip-fusion
#2
Xavier Flecher, Matthieu Ollivier, Pascal Maman, Sébastien Pesenti, Sébastien Parratte, Jean-Noël Argenson
INTRODUCTION: Due to complex anatomical considerations, results of cementless-stem total hip arthroplasty (THA) in hip fusion remain controversial compared with conventional THA. We therefore aimed to analyse 3D anatomy of the fused hip based on pre-operative computed tomography (CT) scans, functional outcomes based on the Harris Hip Score (HHS) and the Hip Disability and Osteoarthritis Outcome Score (HOOS), modifications of hip anatomy based on post-operative standardised radiography, and determine complication rate and long-term survival based on Kaplan-Meier analysis...
January 19, 2018: International Orthopaedics
https://www.readbyqxmd.com/read/29350088/the-use-of-synthetic-ligaments-in-the-design-of-an-enhanced-stability-total-knee-joint-replacement
#3
Michael D Stokes, Brendan C Greene, Luke W Pietrykowski, Taylor M Gambon, Caroline E Bales, John D DesJardins
Current total knee replacement designs work to address clinically desired knee stability and range of motion through a balance of retained anatomy and added implant geometry. However, simplified implant geometries such as bearing surfaces, posts, and cams are often used to replace complex ligamentous constraints that are sacrificed during most total knee replacement procedures. This article evaluates a novel total knee replacement design that incorporates synthetic ligaments to enhance the stability of the total knee replacement system...
January 1, 2018: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29227786/novel-anatomical-based-surgical-technique-for-positioning-of-the-patellar-component-in-total-knee-arthroplasty
#4
Chahine Assi, Nadim Kheir, Camille Samaha, Moussa Chamoun, Kaissar Yammine
The patella remains one of the main sources of post-operative complication following total knee arthroplasty surgery. Optimal positioning of the patellar component is still a controversy with no clear-cut guidelines. Instead of choosing an empirical position, we described a novel surgical technique to better locate the patellar button based on the individual patellar anatomy of each patient.
2017: SICOT-J
https://www.readbyqxmd.com/read/29223778/differences-in-trochlear-parameters-between-native-and-prosthetic-kinematically-or-mechanically-aligned-knees
#5
C Rivière, F Iranpour, S Harris, E Auvinet, A Aframian, S Parratte, J Cobb
INTRODUCTION: Kinematic (KA) and mechanical (MA) alignment techniques are two different philosophies of implant positioning that use the same TKA implants. This might generate differences in the resulting prosthetic trochlea parameters between the two techniques of alignment. Our study aim was to test the following hypotheses: 1) Mechanically or kinematically aligned femoral implant understuffs the native trochlear articular surface and poorly restores the native groove orientation, and 2) The orientation of the prosthetic trochlear groove and trochlear fill are different between MA and KA...
December 6, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/29222607/static-and-fatigue-strength-of-a-novel-anatomically-contoured-implant-compared-to-five-current-open-wedge-high-tibial-osteotomy-plates
#6
Arnaud Diffo Kaze, Stefan Maas, James Belsey, Alexander Hoffmann, Dietrich Pape
BACKGROUND: The purpose of the present study was to compare the mechanical static and fatigue strength of the size 2 osteotomy plate "Activmotion" with the following five other common implants for the treatment of medial knee joint osteoarthritis: the TomoFix small stature, the TomoFix standard, the Contour Lock, the iBalance and the second generation PEEKPower. METHODS: Six fourth-generation tibial bone composites underwent a medial open-wedge high tibial osteotomy (HTO), according to standard techniques, using size 2 Activmotion osteotomy plates...
December 8, 2017: Journal of Experimental Orthopaedics
https://www.readbyqxmd.com/read/29200662/gearing-effects-of-the-patella-knee-extensor-muscle-sesamoid-of-the-helmeted-guineafowl-during-terrestrial-locomotion
#7
V R Allen, R E Kambic, S M Gatesy, J R Hutchinson
Human patellae (kneecaps) are thought to act as gears, altering the mechanical advantage of knee extensor muscles during running. Similar sesamoids have evolved in the knee extensor tendon independently in birds, but it is unknown if these also affect the mechanical advantage of knee extensors. Here, we examine the mechanics of the patellofemoral joint in the helmeted guineafowl Numida meleagris using a method based on muscle and tendon moment arms taken about the patella's rotation centre around the distal femur...
November 2017: Journal of Zoology: Proceedings of the Zoological Society of London
https://www.readbyqxmd.com/read/29173561/the-anterolateral-ligament-does-exist-an-anatomic-description
#8
REVIEW
Stefano Zaffagnini, Alberto Grassi, Giulio Maria Marcheggiani Muccioli, Federico Raggi, Matteo Romagnoli, Alice Bondi, Salvatore Calderone, Cecilia Signorelli
The debate around the existence, anatomy, and role of the so-called anterolateral ligament of the knee represents one of the main sources of recent controversy among orthopedic surgeons. In the modern era of sports medicine, several content experts have contributed to the understanding of the anatomy of the anterolateral aspect of the knee. This article analyzes the historical, phylogenetic, anatomic, arthroscopic, and radiological evidence regarding the anterolateral ligament. The existence of the anterolateral ligament as a distinct ligamentous structure and its exact anatomic features are still matters of controversy and ongoing study...
January 2018: Clinics in Sports Medicine
https://www.readbyqxmd.com/read/29173559/anterolateral-ligament-reconstruction-or-extra-articular-tenodesis-why-and-when
#9
REVIEW
Manoj Mathew, Aad Dhollander, Alan Getgood
Residual rotational laxity following anterior cruciate ligament (ACL) reconstruction has been identified as significant concern in many patients, despite evolution of techniques. The expanding body of knowledge on the anatomy and biomechanics of the anterolateral soft tissue restraints in rotational control of the knee has reignited an interest in extra-articular reconstruction techniques for augmenting ACL reconstruction. Reconstruction techniques currently used can be broadly categorized as either lateral extra-articular tenodesis or reconstruction of the anterolateral ligament...
January 2018: Clinics in Sports Medicine
https://www.readbyqxmd.com/read/29173555/biomechanical-proof-for-the-existence-of-the-anterolateral-ligament
#10
REVIEW
Jorge Chahla, Andrew G Geeslin, Mark E Cinque, Robert F LaPrade
With the recent "description" of the anterolateral ligament (ALL) of the knee, its role in controlling rotational stability has reemerged. An improved understanding of the anatomy of the anterolateral complex of the knee has led to an expansion of the literature on the biomechanics of many structures, including the contribution of the iliotibial band and its deep (Kaplan) fibers, the capsulo-osseous layer, the ALL, and the lateral meniscal posterior root to knee stability. This article describes the primary and secondary roles of key anatomic structures at the anterolateral aspect of the knee...
January 2018: Clinics in Sports Medicine
https://www.readbyqxmd.com/read/29173549/a-layered-anatomic-description-of-the-anterolateral-complex-of-the-knee
#11
REVIEW
Marcin Kowalczuk, Elmar Herbst, Jeremy M Burnham, Marcio Albers, Volker Musahl, Freddie H Fu
Variability in anatomic terminology, dissection protocols, and use of embalmed as opposed to fresh frozen specimens has led to the controversy surrounding the "anterolateral ligament of the knee." Conceptually the complex anatomy of the anterolateral knee is made up of the superficial, middle, deep, and capsulo-osseous layers of the iliotibial band. The anterolateral capsule is deep to these tissues and is directly attached to the lateral meniscus. These structures collectively form the anterolateral complex of the knee...
January 2018: Clinics in Sports Medicine
https://www.readbyqxmd.com/read/29172386/current-concepts-of-posterolateral-corner-injuries-of-the-knee
#12
REVIEW
Oog-Jin Shon, Jae-Woo Park, Beum-Jung Kim
The number of posterolateral corner (PLC) injury patients has risen owing to the increased motor vehicle accidents and sports activities. Careful examination is required because this injury is easy to overlook and may lead to chronic instability. The purpose of this article is to review the anatomy, biomechanics, diagnosis, classification and, treatment of PLC injuries and summarize the recent literatures regarding the treatment outcomes.
December 1, 2017: Knee Surgery & related Research
https://www.readbyqxmd.com/read/29114928/a-new-substitute-for-formalin-application-to-embalming-cadavers
#13
Yoshinori Haizuka, Miki Nagase, Satoshi Takashino, Yasushi Kobayashi, Yoshihisa Fujikura, George Matsumura
The development of formalin-free fixatives is an urgent issue in gross anatomy because of the health hazard and the tissue-hardening actions of formalin. We recently identified the fixative, antimicrobial, and preservative effects of N-vinyl-2-pyrrolidone (NVP), a precursor of the water-soluble macromolecular polymer polyvinylpyrrolidone, in animal experiments. The aim of the present study is to investigate whether NVP solution can be used as an alternative to formalin in human cadaveric dissection. Twelve donated cadavers were infused with NVP via the femoral and common carotid arteries using a peristaltic pump...
November 7, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/29100777/anisometry-of-medial-patellofemoral-ligament-reconstruction-in-the-setting-of-increased-tibial-tubercle-trochlear-groove-distance-and-patella-alta
#14
Lauren H Redler, Kathleen N Meyers, Jacqueline M Brady, Elizabeth R Dennis, Joseph T Nguyen, Beth E Shubin Stein
PURPOSE: To assess the impact elevated tibial tubercle-trochlear groove (TT-TG) distance and patella height, as measured by the Caton-Deschamps Index (CDI), have on the isometry of a reconstructed medial patellofemoral ligament (MPFL). METHODS: Nine fresh-frozen cadaveric knees were placed on a custom testing fixture, with a fixed femur and a mobile tibia. A suture fixed to the MPFL origin on the patella and free to move at the Schöttle point on the femur represented a reconstructed MPFL...
October 31, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29098684/comparative-hindlimb-myology-of-foot-propelled-swimming-birds
#15
Glenna T Clifton, Jennifer A Carr, Andrew A Biewener
Several groups of birds have convergently evolved the ability to swim using their feet despite facing trade-offs with walking. However, swimming relative to terrestrial performance varies across these groups. Highly specialized divers, such as loons and grebes, excel at swimming underwater but struggle to stand on land, whereas species that primarily swim on the water surface, such as Mallards, retain the ability to move terrestrially. The identification of skeletal features associated with a swimming style and conserved across independent groups suggests that the hindlimb of foot-propelled swimming birds has adapted to suit the physical challenges of producing propulsive forces underwater...
November 3, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/29095400/mri-arthroscopy-correlations-ligaments-of-the-knee
#16
Joseph J Ruzbarsky, Gabrielle Konin, Naaman Mehta, Robert G Marx
Magnetic resonance imaging and a thorough understanding of its interpretation in the diagnosis and management of injuries to the ligaments about the knee is an essential skill for orthopedists. The goal of this review is to provide a description of the native and injured anatomy through magnetic resonance imaging and its correlations, when appropriate, as seen through the arthroscope at the time of surgery. The ligaments of focus include the anterior cruciate ligament, the posterior cruciate ligament, the medial collateral ligament, the posterolateral corner, the anterolateral ligament, and the medial patellofemoral ligament...
December 2017: Sports Medicine and Arthroscopy Review
https://www.readbyqxmd.com/read/29083361/chondral-tissue-engineering-of-the-reumatoid-knee-with-collagen-matrix-autologous-chondrocytes-implant
#17
Massimiliano Leigheb, Michela Bosetti, Antonio De Consoli, Alessia Borroni, Mario Cannas, Federico Grassi
Articular cartilage repair is still a challenge. To date evidence is insufficient to support a treatment over the others. Inflammatory conditions in the joint hamper the application of tissue engineering during chronic joint diseases. Most of the Matrix Autologous Chondrocyte Implantation (MACI) cases reported in literature do not deal with rheumatoid knees and do not have a long clinical-histologic follow-up. We report about a 46-year old woman who suffered of a painful focal Outerbridge 4th degree chondral lesion in the medial femoral condyle of her left rheumatoid knee...
October 18, 2017: Acta Bio-medica: Atenei Parmensis
https://www.readbyqxmd.com/read/29071356/no-improvement-in-reducing-outliers-in-coronal-axis-alignment-with-patient-specific-instrumentation
#18
Uwe Maus, Carlos J Marques, David Scheunemann, Frank Lampe, Djordje Lazovic, Hagen Hommel, Dennis Vogel, Martin Haunschild, Tilman Pfitzner
PURPOSE AND HYPOTHESIS: Patient-specific instrumentation (PSI) uses 3D preoperative imaging to produce individualized cutting blocks specific to patients' anatomy and according to the preoperative plan with the aim to reduce the number of mechanical leg alignment (MLA) outliers, to improve implant positioning and to decrease surgery time. The primary purpose of this study was to investigate the efficacy of a specific PSI in comparison with standard instrumentation (SI) in reducing the number of MLA outliers...
October 25, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29067474/restoring-tibiofemoral-alignment-during-acl-reconstruction-results-in-better-knee-biomechanics
#19
Frantzeska Zampeli, Ioannis Terzidis, João Espregueira-Mendes, Jim-Dimitris Georgoulis, Manfred Bernard, Evangelos Pappas, Anastasios D Georgoulis
PURPOSE: Anterior cruciate ligament (ACL) reconstruction (ACLR) aims to restore normal knee joint function, stability and biomechanics and in the long term avoid joint degeneration. The purpose of this study is to present the anatomic single bundle (SB) ACLR that emphasizes intraoperative correction of tibiofemoral subluxation that occurs after ACL injury. It was hypothesized that this technique leads to optimal outcomes and better restoration of pathological tibiofemoral joint movement that results from ACL deficiency (ACLD)...
October 24, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29059112/the-posteromedial-corner-of-the-knee-anatomy-pathology-and-management-strategies
#20
Andrew P Dold, Stephanie Swensen, Eric Strauss, Michael Alaia
The posteromedial corner of the knee encompasses five medial structures posterior to the medial collateral ligament. With modern MRI systems, these structures are readily identified and can be appreciated in the context of multiligamentous knee injuries. It is recognized that anteromedial rotatory instability results from an injury that involves both the medial collateral ligament and the posterior oblique ligament. Like posterolateral corner injuries, untreated or concurrent posteromedial corner injuries resulting in rotatory instability place additional strain on anterior and posterior cruciate ligament reconstructions, which can ultimately contribute to graft failure and poor clinical outcomes...
November 2017: Journal of the American Academy of Orthopaedic Surgeons
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