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https://www.readbyqxmd.com/read/27909675/arthroscopic-primary-repair-of-proximal-anterior-cruciate-ligament-tears
#1
Gregory S DiFelice, Jelle P van der List
In a select group of patients with proximal anterior cruciate ligament (ACL) tears, primary repair can be a useful technique. Preservation of the native ACL may be advantageous for proprioceptive function and is thought to restore normal knee joint kinematics. The procedure is a less morbid and more conservative surgical approach to restore knee stability. Primary repair is preferably performed in the acute setting because of better healing capacity and tissue quality. We present the surgical technique of arthroscopic primary ACL repair with suture anchors in patients with proximal tears and excellent tissue quality...
October 2016: Arthroscopy Techniques
https://www.readbyqxmd.com/read/27900510/does-a-positioning-rod-or-a-patient-specific-guide-result-in-more-natural-femoral-flexion-in-the-concept-of-kinematically-aligned-total-knee-arthroplasty
#2
Max Ettinger, Tilman Calliess, Stephen M Howell
PURPOSE: Flexion of the femoral component in 5° increments downsizes the femoral component, decreases the proximal reach and surface area of the trochlea, delays the engagement of the patella during flexion, and is associated with a higher risk of patellar-femoral instability after kinematically aligned TKA. The present study evaluated flexion of the femoral component after use of two kinematic alignment instrumentation systems. We determined whether a distal cutting block attached to a positioning rod inserted perpendicular to the distal femoral joint line in the axial plane and 8-10 cm into the distal femur anterior and posterior to the distal cortex of the femur in the sagittal plane or a femoral patient-specific cutting guide sets the femoral component in more natural flexion...
November 29, 2016: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/27900192/vertical-stiffness-is-not-related-to-anterior-cruciate-ligament-elongation-in-professional-rugby-union-players
#3
Benjamin G Serpell, Jennie M Scarvell, Mark R Pickering, Nick B Ball, Diana Perriman, John Warmenhoven, Paul N Smith
BACKGROUND: Novel research surrounding anterior cruciate ligament (ACL) injury is necessary because ACL injury rates have remained unchanged for several decades. An area of ACL risk mitigation which has not been well researched relates to vertical stiffness. The relationship between increased vertical stiffness and increased ground reaction force suggests that vertical stiffness may be related to ACL injury risk. However, given that increased dynamic knee joint stability has been shown to be associated with vertical stiffness, it is possible that modification of vertical stiffness could help to protect against injury...
2016: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/27896273/relationships-between-muscle-architecture-of-rectus-femoris-and-functional-parameters-of-knee-motion-in-adults-with-down-syndrome
#4
Maria Stella Valle, Antonino Casabona, Marco Micale, Matteo Cioni
This study was designed to measure in vivo muscle architecture of the rectus femoris in adults with Down syndrome, testing possible relationships with functional parameters of the knee motion. Ten adults with Down syndrome and ten typically developed participated in the study. Pennation angle and thickness of the rectus femoris and subcutaneous layer of the thigh were measured via ultrasound imaging. Knee kinematics and electromyographic activity of the rectus femoris were recorded during free leg dropping...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27895518/single-leg-squats-can-predict-leg-alignment-in-dancers-performing-ballet-movements-in-turnout
#5
Luke S Hopper, Nahoko Sato, Andries L Weidemann
The physical assessments used in dance injury surveillance programs are often adapted from the sports and exercise domain. Bespoke physical assessments may be required for dance, particularly when ballet movements involve "turning out" or external rotation of the legs beyond that typically used in sports. This study evaluated the ability of the traditional single-leg squat to predict the leg alignment of dancers performing ballet movements with turnout. Three-dimensional kinematic data of dancers performing the single-leg squat and five ballet movements were recorded and analyzed...
2016: Open Access Journal of Sports Medicine
https://www.readbyqxmd.com/read/27888697/whole-body-organization-during-a-symmetric-bimanual-pick-up-task-in-overweight-and-obese-children
#6
Ya-Ching Hung, Melissa Mangiafreno, Simone V Gill
Information on the effects of obesity on the biomechanics of whole body movement control in children is limited. The purpose of the current study is to test the hypothesis that during a simple pick up task, overweight and obese children will organize their whole body movements differently than those in normal weight children. Twelve children who were overweight or obese (5-13 years old) and twelve age matched normal weight children participated in the study. Children picked up an empty box to waist height at a self-selected pace while kinematic and kinetic data were recorded and analyzed using a VICON system and two AMTI force plates...
November 19, 2016: Gait & Posture
https://www.readbyqxmd.com/read/27888317/effect-of-tibial-slope-changes-on-femorotibial-contact-kinematics-after-cruciate-retaining-total-knee-arthroplasty
#7
Xi-Qing Pan, A-Qin Peng, Fei Wang, Feng Li, Xi-Zeng Nie, Xi Yang, Gang Ji, Xiao-Meng Wang
PURPOSE: The present study was undertaken to evaluate the effect of tibial slope (TS) changes on the femorotibial articular contact kinematics in subjects undergoing posterior cruciate-retaining total knee arthroplasty (CRTKA). METHODS: Eighteen knees in nine patients with medial osteoarthritis who underwent CRTKA using the same size prosthesis were analysed preoperatively and 2 years after TKA. TS changes were calculated on lateral radiographs taken before and after TKA...
November 25, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/27884055/the-association-of-forefoot-varus-deformity-with-patellofemoral-cartilage-damage-in-older-adult-cadavers
#8
Rebecca S Lufler, Joshua J Stefanik, Jingbo Niu, F Kip Sawyer, Todd M Hoagland, K Douglas Gross
INTRODUCTION: Forefoot alignment may contribute to patellofemoral joint (PFJ) osteoarthritis (OA) via its influence on the closed chain kinematics of the lower limb. The purpose of this cadaveric study was to investigate the relationship between forefoot varus and ipsilateral cartilage damage in the medial and lateral PFJ. MATERIALS AND METHODS: Forefoot alignment measurements were obtained from the feet of 25 cadavers (n=50). Cartilage damage in the medial and lateral PFJ of each knee was scored using the Outerbridge scale...
November 24, 2016: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/27883988/real-time-feedback-to-improve-gait-in-children-with-cerebral-palsy
#9
Linda van Gelder, Adam T C Booth, Ingrid van de Port, Annemieke I Buizer, Jaap Harlaar, Marjolein M van der Krogt
Real-time feedback may be useful for enhancing information gained from clinical gait analysis of children with cerebral palsy (CP). It may also be effective in functional gait training, however, it is not known if children with CP can adapt gait in response to real-time feedback of kinematic parameters. Sixteen children with cerebral palsy (age 6-16; GMFCS I-III), walking with a flexed-knee gait pattern, walked on an instrumented treadmill with virtual reality in three conditions: regular walking without feedback (NF), feedback on hip angle (FH) and feedback on knee angle (FK)...
November 11, 2016: Gait & Posture
https://www.readbyqxmd.com/read/27881382/early-changes-in-knee-center-of-rotation-during-walking-after-anterior-cruciate-ligament-reconstruction-correlate-with-later-changes-in-patient-reported-outcomes
#10
Matthew R Titchenal, Constance R Chu, Jennifer C Erhart-Hledik, Thomas P Andriacchi
BACKGROUND: Altered knee kinematics after anterior cruciate ligament injury and reconstruction (ACLR) have been implicated in the development of posttraumatic osteoarthritis (PTOA), leading to poor long-term clinical outcomes. PURPOSE: This study was conducted to determine (1) whether the average knee center of rotation (KCOR), a multidimensional metric of knee kinematics, of the ACL-reconstructed knee during walking differs from that of the uninjured contralateral knee; (2) whether KCOR changes between 2 and 4 years after surgery; and (3) whether early KCOR changes predict patient-reported outcomes 8 years after ACLR...
November 23, 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/27880849/loading-patterns-of-the-posterior-cruciate-ligament-in-the-healthy-knee-a-systematic-review
#11
S H Hosseini Nasab, Renate List, Katja Oberhofer, Sandro F Fucentese, Jess G Snedeker, William R Taylor
BACKGROUND: The posterior cruciate ligament (PCL) is the strongest ligament of the knee, serving as one of the major passive stabilizers of the tibio-femoral joint. However, despite a number of experimental and modelling approaches to understand the kinematics and kinetics of the ligament, the normal loading conditions of the PCL and its functional bundles are still controversially discussed. OBJECTIVES: This study aimed to generate science-based evidence for understanding the functional loading of the PCL, including the anterolateral and posteromedial bundles, in the healthy knee joint through systematic review and statistical analysis of the literature...
2016: PloS One
https://www.readbyqxmd.com/read/27874298/volitional-spine-stabilization-during-a-drop-vertical-jump-from-different-landing-heights-implications-for-anterior-cruciate-ligament-injury
#12
Ram Haddas, Troy Hooper, C Roger James, Phillip S Sizer
CONTEXT:  Volitional spine stabilization (VSS) during dynamic activities may alter trunk motion, but the role of the core musculature in positioning the trunk during landing tasks is unclear. OBJECTIVE:  To determine whether volitional core-muscle activation incorporated during a drop vertical jump alters lower extremity kinematics and kinetics, as well as trunk and lower extremity muscle activity at different landing heights. DESIGN:  Controlled laboratory study...
November 22, 2016: Journal of Athletic Training
https://www.readbyqxmd.com/read/27872123/effect-of-external-ankle-support-on-ankle-and-knee-biomechanics-during-the-cutting-maneuver-in-basketball-players
#13
Nardia-Rose Klem, Catherine Y Wild, Sian A Williams, Leo Ng
BACKGROUND: Despite the high prevalence of lower extremity injuries in female basketball players as well as a high proportion of athletes who wear ankle braces, there is a paucity of research pertaining to the effects of ankle bracing on ankle and knee biomechanics during basketball-specific tasks. PURPOSE: To compare the effects of a lace-up brace (ASO), a hinged brace (Active T2), and no ankle bracing (control) on ankle and knee joint kinematics and joint reaction forces in female basketball athletes during a cutting maneuver...
November 21, 2016: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/27871661/single-bundle-anatomic-anterior-cruciate-ligament-reconstruction-surgical-technique-pearls-and-pitfalls
#14
REVIEW
Chaitu S Malempati, Adam V Metzler, Darren L Johnson
Anterior cruciate ligament (ACL) ruptures are some of the most common sports-related injuries. Treatment of these injuries with ACL reconstruction has evolved over the last several decades. Anatomic single-bundle ACL reconstruction offers an accurate and reproducible method to reproduce native knee anatomy, restore knee kinematics, and ultimately restore function and decrease long-term degenerative effects. The importance of adequate arthroscopic visualization and a thorough understanding of the native anatomic ACL landmarks are discussed in this article...
January 2017: Clinics in Sports Medicine
https://www.readbyqxmd.com/read/27871019/comparison-of-lower-limb-and-trunk-kinematics-between-markerless-and-marker-based-motion-capture-systems
#15
Margaret A Perrott, Tania Pizzari, Jill Cook, Jodie A McClelland
: Three dimensional (3-D) motion capture systems are used by researchers and clinicians to analyze the kinematics of human movement. Traditional marker based systems are time consuming and limit the size of studies. Markerless 3-D systems are quicker to use but the differences between data captured in each system is unclear. AIM: To examine the relationship of kinematic data captured by marker based and markerless motion capture systems. METHODS: Movement was assessed in two tests: a simple knee flexion test and single leg squat with a marker based protocol (Vicon) and a markerless protocol (Organic Motion)...
October 31, 2016: Gait & Posture
https://www.readbyqxmd.com/read/27865130/effects-of-fatigue-on-lower-limb-pelvis-and-trunk-kinematics-and-muscle-activation-gender-differences
#16
Giovanna Camparis Lessi, Ana Flávia Dos Santos, Luis Fylipe Batista, Gabriela Clemente de Oliveira, Fábio Viadanna Serrão
BACKGROUND: Muscle fatigue is associated with biomechanical changes that may lead to anterior cruciate ligament (ACL) injuries. Alterations in trunk and pelvis kinematics may also be involved in ACL injury. Although some studies have compared the effects of muscle fatigue on lower limb kinematics between men and women, little is known about its effects on pelvis and trunk kinematics. The aim of the study was to compare the effects of fatigue on lower limb, pelvis and trunk kinematics and muscle activation between men and women during landing...
November 9, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27863284/landing-from-different-heights-biomechanical-and-neuromuscular-strategies-in-trained-gymnasts-and-untrained-prepubescent-girls
#17
Α Christoforidou, D A Patikas, E Bassa, I Paraschos, S Lazaridis, C Christoforidis, C Kotzamanidis
The purpose of this study was to examine the biomechanics of the lower limb, during landing in female prepubertal gymnasts and prepubertal untrained girls, aged 9-12years. Ten healthy participants were included in each group and performed five landings from 20, 40, and 60cm. Kinematics, ground reaction forces (GRF) and electromyogram (EMG) from the lateral gastrocnemius, tibialis anterior, and vastus lateralis are presented. Gymnasts had higher vertical GRF and shorter braking phase during landing. Compared to untrained girls, gymnasts exhibited for all examined drop heights more knee flexion before and at ground contact, but less knee flexion at maximum knee flexion position...
November 9, 2016: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/27857485/kinematic-alignment-in-total-knee-arthroplasty-does-it-really-matter
#18
EDITORIAL
Raju Karuppal
No abstract text is available yet for this article.
December 2016: Journal of Orthopaedics
https://www.readbyqxmd.com/read/27856105/weakening-iliopsoas-muscle-in-healthy-adults-may-induce-stiff-knee-pattern
#19
N Ekin Akalan, Shavkat Kuchimov, Adnan Apti, Yener Temelli, Anand Nene
OBJECTIVE: The goal of the present study was to investigate the relationship between iliopsoas muscle group weakness and related hip joint velocity reduction and stiff-knee gait (SKG) during walking in healthy individuals. METHODS: A load of 5% of each individual's body weight was placed on non-dominant thigh of 15 neurologically intact, able-bodied participants (average age: 22.4 ± 0.81 years). For 33 min (135 s × 13 repetitions × 5 s rest), a passive stretch (PS) was applied with the load in place until hip flexor muscle strength dropped from 5/5 to 3+/5 according to manual muscle test...
November 14, 2016: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/27856067/posterior-cruciate-ligament-retention-or-substitution-during-total-knee-arthroplasty-does-not-affect-long-term-bone-mineral-density-or-quality
#20
Yoshinori Ishii, Hideo Noguchi, Junko Sato, Koji Todoroki, Shin-Ichi Toyabe
BACKGROUND: Physical activity is recognized as one of the factors that influence bone mineral density (BMD) and bone quality after total knee arthroplasty (TKA). According to biomechanical analyses after posterior cruciate ligament (PCL) retaining (PCLR) and substituting (PCLS) TKA, each implant design has different kinematics and kinetics. The purposes of this study were: (1) to perform within-patient comparisons of the midterm and long-term effects of PCL retention in mobile-bearing TKA on proximal femur and tibia BMD and calcaneus bone quality measured using ultrasound and (2) to identify correlations between them...
October 26, 2016: Journal of Arthroplasty
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