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https://www.readbyqxmd.com/read/28441059/effectiveness-of-neuromuscular-training-based-on-the-neuromuscular-risk-profile
#1
Timothy E Hewett, Kevin R Ford, Yingying Y Xu, Jane Khoury, Gregory D Myer
BACKGROUND: The effects of targeted neuromuscular training (TNMT) on movement biomechanics associated with the risk of anterior cruciate ligament (ACL) injuries are currently unknown. Purpose/Hypotheses: To determine the effectiveness of TNMT specifically designed to increase trunk control and hip strength. The hypotheses were that (1) TNMT would decrease biomechanical and neuromuscular factors related to an increased ACL injury risk and (2) TNMT would decrease these biomechanical and neuromuscular factors to a greater extent in athletes identified as being at a high risk for future ACL injuries...
April 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28439637/tibiofemoral-rotational-alignment-affects-flexion-angles-in-navigated-posterior-stabilized-total-knee-arthroplasty
#2
Kazunari Ishida, Nao Shibanuma, Tomoyuki Matsumoto, Akihiko Toda, Shinya Oka, Kazuki Kodato, Koji Takayama, Masahiro Kurosaka, Ryosuke Kuroda
PURPOSE: To investigate the tibiofemoral rotational profiles during navigated posterior-stabilized (PS) total knee arthroplasty (TKA) and investigate the effect on post-operative maximum flexion angles. METHODS: Twenty-five subjects, treated with navigated PS TKA, were enrolled, and the effect of posterior cruciate ligament (PCL) resection and component implantation on tibiofemoral rotational kinematics was statistically evaluated. Then, the effect of rotational alignment changes on the post-operative maximum angles was retrospectively examined in 96 subjects using the multiple regression analysis...
April 24, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28437676/superior-inferior-position-of-patellar-component-affects-patellofemoral-kinematics-and-contact-forces-in-computer-simulation
#3
Shinichiro Nakamura, Yoshihisa Tanaka, Shinichi Kuriyama, Kohei Nishitani, Hiromu Ito, Moritoshi Furu, Shuichi Matsuda
BACKGROUND: Anterior knee pain has been reported as a major postoperative complication after total knee arthroplasty, which may lead to patient dissatisfaction. Rotational alignment and the medial-lateral position correlate with patellar maltracking, which can cause knee pain postoperatively. However, the superior-inferior position of the patellar component has not been investigated. The purpose of the current study was to investigate the effects of the patellar superior-inferior position on patellofemoral kinematics and kinetics...
April 18, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28437130/lower-limb-and-trunk-biomechanics-after-fatigue-in-competitive-female-irish-dancers
#4
Catherine Y Wild, Avril Grealish, Diana Hopper
CONTEXT:   Because of the increasing popularity of participation in Irish dance, the incidence of lower limb injuries is high among this competitive population. OBJECTIVE:   To investigate the effects of fatigue on the peak lower limb and trunk angles as well as the peak lower limb joint forces and moments of competitive female Irish dancers during the performance of a dance-specific single-limb landing. DESIGN:   Cross-sectional study...
April 24, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28435336/anterior-cruciate-ligament-injury-reinjury-in-alpine-ski-racing-a-narrative-review
#5
REVIEW
Matthew J Jordan, Per Aagaard, Walter Herzog
The purpose of the present review was to: 1) provide an overview of the current understanding on the epidemiology, etiology, risk factors, and prevention methods for anterior cruciate ligament (ACL) injury in alpine ski racing; and 2) provide an overview of what is known pertaining to ACL reinjury and return to sport after ACL injury in alpine ski racing. Given that most of the scientific studies on ACL injuries in alpine ski racing have been descriptive, and that very few studies contributed higher level scientific evidence, a nonsystematic narrative review was employed...
2017: Open Access Journal of Sports Medicine
https://www.readbyqxmd.com/read/28434699/reproducibility-and-precision-of-ct-scans-to-evaluate-tibial-component-rotation
#6
Derek F Amanatullah, Matthieu P Ollivier, Graham D Pallante, Matthew P Abdel, Henry D Clarke, Tad M Mabry, Michael J Taunton
BACKGROUND: Component rotation likely plays a greater role on the survivorship and outcomes of total knee arthroplasties than is currently known. Our goal was to evaluate the precision, interobserver reliability, and intrarater reliability of tibial component rotation as measured by computed tomography (CT) scan, regardless of measurement technique. METHODS: Three fellowship-trained, academic arthroplasty surgeons independently measured tibial component rotation on CT scans of 62 total knee arthroplasties using their methods of choice...
February 1, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28434698/influence-of-component-rotation-in-total-knee-arthroplasty-on-tibiofemoral-kinematics-a-cadaveric-investigation
#7
Guenther Maderbacher, Armin Keshmiri, Hans R Springorum, Hermann Maderbacher, Joachim Grifka, Clemens Baier
BACKGROUND: Physiological tibiofemoral kinematics have been shown to be important for good knee function after total knee arthroplasty (TKA). The purpose of the present study was to investigate the influence of component rotation on tibiofemoral kinematics during knee flexion. We asked which axial component alignment best reconstructs physiological tibiofemoral kinematics and which combinations should be avoided. METHODS: Ten healthy cadaveric knees were examined...
April 1, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28433427/do-medial-pivot-kinematics-correlate-with-patient-reported-outcomes-after-total-knee-arthroplasty
#8
Lucian C Warth, Marshall K Ishmael, Evan R Deckard, Mary Ziemba-Davis, R Michael Meneghini
BACKGROUND: Many total knee arthroplasty (TKA) implants are designed to facilitate a medial pivot kinematic pattern. The purpose of this study was to determine whether intraoperative medial pivot kinematic patterns are associated with improved patient outcomes. METHODS: A retrospective review of consecutive primary TKAs was performed. Sensor-embedded tibial trials determined kinematic patterns intraoperatively. The center of rotation (COR) was identified from 0° to 90° and from 0° to terminal flexion, and designated medial-pivot or non-medial pivot based on accepted criteria...
March 18, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28431561/the-evaluation-of-the-role-of-medial-collateral-ligament-maintaining-knee-stability-by-a-finite-element-analysis
#9
Dong Ren, Yueju Liu, Xianchao Zhang, Zhaohui Song, Jian Lu, Pengcheng Wang
BACKGROUND: A three-dimensional finite element model (FEM) of the knee joint was established to analyze the biomechanical functions of the superficial and deep medial collateral ligaments (MCLs) of knee joints and to investigate the treatment of the knee medial collateral ligament injury. METHODS: The right knee joint of a healthy male volunteer was subjected to CT and MRI scans in the extended position. The scanned data were imported into MIMICS, Geomagic, and ANSYS software to establish a three-dimensional FEM of the human knee joint...
April 21, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28426251/current-concepts-of-the-anterolateral-ligament-of-the-knee-anatomy-biomechanics-and-reconstruction
#10
Matthew J Kraeutler, K Linnea Welton, Jorge Chahla, Robert F LaPrade, Eric C McCarty
In 1879, Paul Segond described an avulsion fracture (now known as a Segond fracture) at the anterolateral proximal tibia with the presence of a fibrous band at the location of this fracture. Although references to this ligament were occasionally made in the anatomy literature after Segond's discovery, it was not until 2012 that Vincent et al named this ligament what we know it as today, the anterolateral ligament (ALL) of the knee. The ALL originates near the lateral epicondyle of the distal femur and inserts on the proximal tibia near Gerdy's tubercle...
April 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28419877/effect-of-foot-orthoses-on-the-medial-longitudinal-arch-in-children-with-flexible-flatfoot-deformity-a-three-dimensional-moment-analysis
#11
Amir Ali Jafarnezhadgero, Morteza Madadi Shad, Mahdi Majlesi
Foot orthoses are often used to correct altered gait patterns. The purpose of this study was to investigate how foot orthoses can modify the magnitude of three dimensional moments of ankle, knee, and hip joints during a stride of gait in children with flexible flat feet. Bilateral gait data were collected from fourteen male children (age 10.2±1.4 years) suffering from flat feet syndrome. In order to obtain the kinematics data, a Vicon system with six cameras (100Hz) was used and two Kistler force plates (1000Hz) to record the kinetics data under each leg...
April 7, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28410261/successful-continuous-adductor-canal-block-placement-in-a-patient-with-absent-sartorius-muscle-a-case-report
#12
Shin-E Lin, David B Auyong, Aaron B Dahl, Neil A Hanson
We report a novel case of a patient who presented for elective total knee arthroplasty and had distorted adductor canal anatomy due to previous sartorius rotational flap surgery. Despite the lack of a sartorius muscle on the intended operative limb, we describe the successful placement of a continuous adductor canal block. This case is a clinically relevant example that highlights the importance of the vastoadductor membrane as the anatomical anteromedial boundary for the adductor canal, and that it remains intact even after sartorius muscle flap surgery...
April 13, 2017: A & A Case Reports
https://www.readbyqxmd.com/read/28410094/stiffness-perception-during-active-ankle-and-knee-movement
#13
Alejandro F Azocar, Elliott J Rouse
OBJECTIVE: Recently, human joint impedance-the instantaneous mechanical response to a perturbation-has been quantified during gait, providing new insight beyond the traditional biomechanical descriptions of kinetics and kinematics. However, the role of joint impedance in neuromotor control and the development of exoskeletons and other wearable robotic systems remains unknown. One approach to studying the role of impedance in neuromotor control involves characterizing the human ability to discriminate changes in external impedance properties...
April 6, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28397456/postoperative-knee-joint-stability-following-anterior-cruciate-ligament-reconstruction-using-the-ligament-advanced-reinforcement-system
#14
Sebastian Krupa, Aleksandra Królikowska, Paweł Reichert
BACKGROUND: One of the goals of the synthetic materials used in knee joint reconstruction of the anterior cruciate ligament (ACL) is to improve the strength and stability of the graft immediately after the reconstruction. One of the synthetic grafts is a non-absorbable synthetic ligament device made of terephthalic polyethylene polyester fibers, the Ligament Advanced Reinforcement System (LARS). OBJECTIVES: The aim of the study was to assess postoperative knee joint stability in patients who had undergone ACL reconstruction using the LARS graft...
July 2016: Polimery W Medycynie
https://www.readbyqxmd.com/read/28389879/superior-long-term-survival-for-fixed-bearing-compared-with-mobile-bearing-in-ligament-balanced-total-knee-arthroplasty
#15
P J C Heesterbeek, A H van Houten, J S Klenk, H Eijer, B Christen, A B Wymenga, A J Schuster
PURPOSE: Only few long-term data on ligament-balanced cruciate-retaining total knee arthroplasty (CR TKA) are currently available. Either a mobile- or fixed-bearing insert can be chosen, which showed good mid-term outcome and few complications and revisions. This multi-centre retrospective cross-sectional cohort study investigated the 12-year results of primary TKA using a balancing gap technique and compared survival and clinical outcome between fixed and mobile inserts. METHODS: In this retrospective cross-sectional cohort study, 557 cases of three clinics (2 Swiss, 1 Dutch) operated between 1998 and 2003 with the first series of a TKA implanted with a balanced gap technique (433 (77...
April 7, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28389724/effectiveness-of-hip-external-rotator-strengthening-exercise-in-korean-postural-bowleg-women
#16
Seong Hoon Park, Jun Won Lee, Joo Hyun Kim, Kyoung Seok Tak, Byeong Ho Lee, In Suck Suh
Postural bowleg is a subclinical entity with both aesthetic and functional outcomes and appears to be common in East Asian countries. Internal rotation of the hip joint is associated with varus alignment at the knee joint of the bowleg. Strengthening exercise for the hip external rotator muscles seems to be effective in improving varus alignment of bowleg, but no standardized exercise program exists. A standardized active resistance strengthening exercise for hip external rotator muscles could improve varus alignment of the lower limb in bowlegged Korean women...
April 7, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28388232/increasing-and-decreasing-pain-causes-acute-responses-of-strength-and-running-mechanics-in-patellofemoral-pain
#17
David M Bazett-Jones, Wendy Huddleston, Stephen Cobb, Kristian O'Connor, Jennifer E Earl-Boehm
CONTEXT:   Patellofemoral pain (PFP) is typically exacerbated by repetitive activities that load the patellofemoral joint, such as running. Understanding the mediating effects of changes in pain in individuals with PFP might inform injury progression, rehabilitation, or both. OBJECTIVE:   To investigate the effects of changing pain on muscular strength and running biomechanics in those with PFP. DESIGN:   Crossover study. SETTING:   University research laboratory...
April 7, 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28378137/hip-external-rotation-strength-predicts-hop-performance-after-anterior-cruciate-ligament-reconstruction
#18
Paul W Kline, Jeremy Burnham, Michael Yonz, Darren Johnson, Mary Lloyd Ireland, Brian Noehren
PURPOSE: Quadriceps strength and single-leg hop performance are commonly evaluated prior to return to sport after anterior cruciate ligament reconstruction (ACLR). However, few studies have documented potential hip strength deficits after ACLR, or ascertained the relative contribution of quadriceps and hip strength to hop performance. METHODS: Patients cleared for return to sports drills after ACLR were compared to a control group. Participants' peak isometric knee extension, hip abduction, hip extension, and hip external rotation (HER) strength were measured...
April 4, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28377644/finite-element-analysis-of-sagittal-balance-in-different-morphotype-forces-and-resulting-strain-in-pelvis-and-spine
#19
REVIEW
Vincenzo Filardi, Portaro Simona, Giorgio Cacciola, Salvatore Bertino, Luigi Soliera, Andrea Barbanera, Alessandro Pisani, Demetrio Milardi, Bramanti Alessia
In humans, vertical posture acquisition caused several changes in bones and muscles which can be assumed as verticalization. Pelvis, femur, and vertebral column gain an extension position which decreases muscular work by paravertebral muscles in the latter. It's widely known that six different morphological categories exist; each category differs from the others by pelvic parameters and vertebral column curvatures. Both values depend on the Pelvic Incidence, calculated as the angle between the axes passing through the rotation centre of the two femur heads and the vertical axis passing through the superior plate of the sacrum...
June 2017: Journal of Orthopaedics
https://www.readbyqxmd.com/read/28377262/evaluation-of-malrotation-following-intramedullary-nailing-in-a-femoral-shaft-fracture-model-can-a-3d-c-arm-improve-accuracy
#20
Austin J Ramme, Jonathan Egol, Gregory Chang, Roy I Davidovitch, Sanjit Konda
INTRODUCTION: Difficulty determining anatomic rotation following intramedullary (IM) nailing of the femur continues to be problematic for surgeons. Clinical exam and fluoroscopic imaging of the hip and knee have been used to estimate femoral version, but are inaccurate. We hypothesize that 3D c-arm imaging can be used to accurately measure femoral version following IM nailing of femur fractures to prevent rotational malreduction. METHODS: A midshaft osteotomy was created in a femur Sawbone to simulate a transverse diaphyseal fracture...
March 31, 2017: Injury
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