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https://www.readbyqxmd.com/read/29144568/kinematic-analysis-of-pressing-situations-in-female-collegiate-football-games-new-insight-into-acl-injury-causation
#1
Shogo Sasaki, Hideyuki Koga, Tron Krosshaug, Satoshi Kaneko, Toru Fukubayashi
The most common events during which anterior cruciate ligament (ACL) injuries occur in football are pressing situations. This study aimed to describe the knee and hip joint kinematics during pressing situations in football games in order to identify kinematic patterns in actions with a high risk for ACL injuries. We filmed 5 female collegiate football matches and identified 66 pressing situations. Five situations with a large distance between the trunk and foot placements in the sagittal plane were analysed using a model-based image-matching technique...
November 16, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29142272/individuals-of-the-common-namib-day-gecko-vary-in-how-adaptive-simplification-alters-sprint-biomechanics
#2
Clint E Collins, Timothy E Higham
Locomotion inextricably links biomechanics to ecology as animals maneuver through mechanically challenging environments. Faster individuals are more likely to escape predators, surviving to produce more offspring. Fast sprint speed evolved several times in lizards, including geckos. However, the underlying mechanisms determining performance await discovery in many clades. Novel morphological structures influence these mechanisms by adding complexity to the government of locomotion. Gecko adhesion coevolves with modified muscles, tendons, and reflexes...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29140159/athletes-rated-as-poor-single-leg-squat-performers-display-measureable-differences-in-single-leg-squat-biomechanics-compared-to-good-performers
#3
Lachlan E Garrick, Bryce C Alexander, Anthony G Schache, Marcus G Pandy, Kay M Crossley, Natalie J Collins
CONTEXT: It is important to validate single-leg squat visual rating criteria used in clinical practice and research. Foot orthoses may improve single-leg squat performance in those who demonstrate biomechanics associated with increased risk of lower-limb injury. OBJECTIVE: Validate visual rating criteria proposed by Crossley et al, by determining whether athletes rated as poor single-leg squat performers display different single-leg squat biomechanics than good performers; and evaluate immediate effects of foot orthoses on single-leg squat biomechanics in poor performers...
November 15, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/29138915/anatomic-double-bundle-acl-reconstruction-outperforms-any-types-of-single-bundle-acl-reconstructions-in-controlling-dynamic-rotational-laxity
#4
A Maeyama, Y Hoshino, Y Kato, A Debandi, P Lertwanich, J H Wang, P Smolinski, F H Fu
PURPOSE: To compare the different types of ACL reconstructions in terms of knee dynamic laxity evaluated by acceleration. METHODS: Sixteen fresh frozen cadaveric knees were used. Pivot shift test was manually performed while monitoring the tibial acceleration by use of a triaxial accelerometer. The test was repeated before and after the ACL resection and reconstruction. Three types of ACL reconstruction were tested: (1) Anatomic Single-Bundle reconstruction (n = 8), the graft was placed at the center of the ACL footprint for the both femoral and tibial sides (tunnel diameter: 8mm); (2) Conventional Single-Bundle reconstruction (n = 8), the graft was placed from the tibial PL footprint to femoral high AM position (tunnel diameter: 8mm) and (3) Anatomic Double-Bundle reconstruction (n = 8)...
November 14, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29136255/loss-of-internal-tibial-rotation-after-anterior-cruciate-ligament-reconstruction
#5
Shawn R Brandenburg, Thomas M Matelic
The flexion angle of the knee and the position of the tibia need to be considered during tensioning of the anterior cruciate ligament (ACL) graft to avoid overconstraining the knee. The purpose of this report was to describe 2 cases of loss of tibial internal rotation after single-bundle anatomic ACL reconstruction with graft tensioning in flexion. Retrospective review of each patient's operative chart revealed that the graft was tensioned in flexion and placed in an anatomic position in the femoral tunnel at the time of the index operation...
November 11, 2017: Orthopedics
https://www.readbyqxmd.com/read/29129618/rotating-hinge-implants-for-complex-primary-and-revision-total-knee-arthroplasty
#6
Sean M Kearns, Brian M Culp, Daniel D Bohl, Scott M Sporer, Craig J Della Valle, Brett R Levine
BACKGROUND: Contemporary rotating hinge knee (RHK) prosthesis has shown improved survival rates over earlier generations. However, reports of high complication and mechanical failure rates highlight the need for more clinical outcome data in the complex primary and revision setting. The purpose of this study is to report our results of using a contemporary rotating hinge for complex primary and revision total knee arthroplasty. METHODS: Using a prospectively maintained surgical database, 79 knees in 76 patients who underwent an RHK of a single design for either a complex primary (14 knees) or revision total knee arthroplasty (65 knees) were identified...
October 16, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/29128913/radiographic-markers-for-measuring-tibial-rotation-based-on-ct-reconstructed-radiographs-an-accuracy-and-feasibility-study
#7
David Hakimian, Amal Khoury, Rami Mosheiff, Meir Liebergall, Yoram A Weil
OBJECTIVES: Malreduction in the axial plane (malrotation) following tibial fracture surgery is often undiagnosed. A few clinical and radiographic methods have been proposed for measuring tibial rotation intraoperatively, yet have failed to match the accuracy of computed tomography (CT). The aim of this study was to develop radiographic tools for future intraoperative assessment of the tibial shaft rotation profile. METHODS: The setting was a laboratory computerized analysis...
November 11, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/29128876/internal-femoral-component-malrotation-in-tka-significantly-alters-tibiofemoral-kinematics
#8
Thomas J Heyse, Bilal F El-Zayat, Ronny De Corte, Yan Chevalier, Susanne Fuchs-Winkelmann, Luc Labey
PURPOSE: Femoral component malrotation in total knee arthroplasty (TKA) is clinically proven to cause dissatisfaction and impaired function. This study is an attempt to characterize the tibiofemoral kinematics following femoral malrotation in posterior stabilized (PS) TKA. It was hypothesized that internal malrotation would introduce the most pronounced changes. METHODS: Six fresh-frozen cadaver specimens were mounted in a kinematic rig. Three motion patterns were applied with the native knee and following PS TKA (passive motion, open chain extension, and squatting) while infrared cameras recorded the trajectories of markers attached to femur and tibia...
November 11, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29125074/-a-soccer-player-with-an-unstable-knee
#9
D Janssen, B Koc, E Jansen
A 19-year-old soccer player presented with instability of his left knee after a rotation trauma. Congenital absence of the anterior cruciate ligament was suspected because of leg length discrepancy and specific MRI findings. He regained stability after an anterior cruciate reconstruction.
2017: Nederlands Tijdschrift Voor Geneeskunde
https://www.readbyqxmd.com/read/29124364/sagittal-magnetic-resonance-imaging-scan-orientation-significantly-influences-accuracy-of-femoral-posterior-condylar-offset-measurement
#10
Peter Balcarek, Ali Seif Amir Hosseini, Ulrike Streit, Tobias Franz Brodkorb, Tim Alexander Walde
BACKGROUND: In total knee arthroplasty the femoral posterior condylar offset (PCO) may serve as a potential branch for correct femoral component positioning. The technique of adjusting the sagittal magnetic resonance imaging (MRI)-scan on which it is measured has not been investigated in previous literature, but may be subject to variances due to knee joint positioning or axial localizer scan angulation. The purpose of this study was to investigate the effect of simulated femur rotation on the accuracy of PCO measurement...
November 10, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/29124285/kinematics-and-arthrokinematics-in-the-chronic-acl-deficient-knee-are-altered-even-in-the-absence-of-instability-symptoms
#11
Chen Yang, Yasutaka Tashiro, Andrew Lynch, Freddie Fu, William Anderst
PURPOSE: To analyze the in vivo kinematics and arthrokinematics of chronic ACL-deficient (ACL-D) and unaffected contralateral knees during level walking and downhill running using dynamic biplane radiography. It was hypothesized that ACL-D knees would demonstrate increased anterior translation and internal rotation, and that ACL-deficiency would alter the tibiofemoral contact paths in comparison to the unaffected contralateral side. METHODS: Eight participants with unilateral chronic ACL-D without instability symptoms were recruited...
November 9, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29124075/the-role-of-lateral-extra-articular-tenodesis-in-primary-anterior-cruciate-ligament-reconstruction-a-systematic-review-with-meta-analysis-and-best-evidence-synthesis
#12
Brian M Devitt, Stuart W Bell, Clare L Ardern, Taylor Hartwig, Tabitha J Porter, Julian A Feller, Kate E Webster
Background: The role of lateral extra-articular tenodesis (LEAT) to augment primary anterior cruciate ligament reconstruction (ACLR) remains controversial. Purpose: To determine whether the addition of LEAT to primary ACLR provides greater control of rotational laxity and improves clinical outcomes compared with ACLR alone and to assess the impact of early versus delayed ACLR. Study Design: Systematic review; Level of evidence, 3. Methods: Two reviewers independently searched 7 databases for randomized and nonrandomized clinical studies comparing ACLR plus LEAT versus ACLR alone...
October 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29123446/ankylosing-spondylitis-and-balance
#13
REVIEW
Alper Uckun, Ilhan Sezer
Ankylosing spondylitis is a chronic inflammatory disease that mainly affects axial joints and the changes in the vertebrae cause typical kyphotic posture. In patients with ankylosing spondylitis, the postural changes, including cervical flexion, decreased lumbar lordosis, posterior rotation of pelvis, hip extension, knee flexion, and plantar flexion of ankle along with kyphosis, may occur in the upcoming terms of the disease and may negatively affect balance. Joint and eye involvements; muscular, vestibular and proprioceptional changes can also affect balance...
October 2017: Eurasian Journal of Medicine
https://www.readbyqxmd.com/read/29118716/etiology-and-recovery-of-neuromuscular-fatigue-following-competitive-soccer-match-play
#14
Callum G Brownstein, Jack P Dent, Paul Parker, Kirsty M Hicks, Glyn Howatson, Stuart Goodall, Kevin Thomas
Aim: Previous research into the etiology of neuromuscular fatigue following competitive soccer match-play has primarily focused on peripheral perturbations, with limited research assessing central nervous system function in the days post-match. The aim of the present study was to examine the contribution and time-course of recovery of central and peripheral factors toward neuromuscular fatigue following competitive soccer match-play. Methods: Sixteen male semi-professional soccer players completed a 90-min soccer match...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29117248/medial-knee-loading-is-altered-in-subjects-with-early-osteoarthritis-during-gait-but-not-during-step-up-and-over-task
#15
Susana Meireles, Mariska Wesseling, Colin R Smith, Darryl G Thelen, Sabine Verschueren, Ilse Jonkers
This study evaluates knee joint loading during gait and step-up-and-over tasks in control subjects, subjects with early knee OA and those with established knee OA. Thirty-seven subjects with varying degrees of medial compartment knee OA severity (eighteen with early OA and sixteen with established OA), and nineteen healthy controls performed gait and step-up-and-over tasks. Knee joint moments, contact forces (KCF), the magnitude of contact pressures and center of pressure (CoP) location were analyzed for the three groups for both activities using a multi-body knee model with articular cartilage contact, 14 ligaments, and six degrees of freedom tibiofemoral and patellofemoral joints...
2017: PloS One
https://www.readbyqxmd.com/read/29114563/risk-factors-for-lower-extremity-overuse-injuries-in-female-youth-soccer-players
#16
John W O'Kane, Moni Neradilek, Nayak Polissar, Lori Sabado, Allan Tencer, Melissa A Schiff
Background: Youth soccer injuries are common and of increasing concern, with sport specialization occurring at younger ages. Limited research is available regarding overuse injuries and risk factors in young female athletes. Purpose: To identify the number and rate of overuse injuries in female soccer players (ages 12-15 years), describe the anatomic location and type of injury, and evaluate contributing risk factors. Study Design: Case-control study; Level of evidence, 3...
October 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29113159/treatment-of-osteosarcoma-around-the-knee-in-skeletally-immature-patients
#17
Weitao Yao, Qiqing Cai, Jiaqiang Wang, Songtao Gao
Limb sparing surgery in growing young patients with malignant tumors is difficult as invasion of the physis by the tumor or surgical resection through the metaphysis may cause significant limb discrepancy following surgery. At present, hinged tumor prosthesis or biological reconstructions are the main methods following tumor resection in these patients. The aim of the present study was to assess different procedures for the treatment of osteosarcoma around knee joints in immature patients. A retrospective study of 56 patients (<15 years old, open physis) who had been treated for osteosarcoma around the knee joint between January 2007 and December 2015 was performed...
November 2017: Oncology Letters
https://www.readbyqxmd.com/read/29106743/quantifying-meniscal-kinematics-in-dogs
#18
Brian H Park, Scott A Banks, Antonio Pozzi
The dog has been used extensively as an experimental model to study meniscal treatments such as meniscectomy, meniscal repair, transplantation and regeneration. However, there is very little information on meniscal kinematics in the dog. This study used MR imaging to quantify in vitro meniscal kinematics in loaded dog knees in four distinct poses: extension, flexion, internal and external rotation. A new method was used to track the meniscal poses along the convex and posteriorly tilted tibial plateau. Meniscal displacements were large, displacing 13...
November 6, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/29101982/acr-appropriateness-criteria-%C3%A2-imaging-after%C3%A2-total%C3%A2-knee-arthroplasty
#19
Mary G Hochman, Yulia V Melenevsky, Darlene F Metter, Catherine C Roberts, Jenny T Bencardino, R Carter Cassidy, Michael G Fox, Mark J Kransdorf, Douglas N Mintz, Nehal A Shah, Kirstin M Small, Stacy E Smith, Kathy M Tynus, Barbara N Weissman
Total knee arthroplasty (TKA) is the most commonly performed joint replacement procedure in the United States and annual demand for primary TKA is expected to grow by 673% by 2030. The first part provides an overview of imaging modalities (radiographs, CT, MRI, ultrasound, and various nuclear medicine studies) and discusses their usefulness in the imaging evaluation of TKA. The second part focuses on evidence-based imaging and imaging-guided intervention algorithms for the workup of TKA and its complications, including routine follow-up, component wear, periprosthetic infection, aseptic loosening, granulomas/osteolysis, conventional and rotational instability, periprosthetic fracture, patellar complications, and a variety of periprosthetic soft tissue abnormalities...
November 2017: Journal of the American College of Radiology: JACR
https://www.readbyqxmd.com/read/29101403/evaluation-of-the-effect-of-bariatric-surgery-induced-weight-loss-on-knee-gait-and-cartilage-degeneration
#20
Mimmi K Liukkonen, Mika E Mononen, Paavo Vartiainen, Päivi Kaukinen, Timo Bragge, Juha-Sampo Suomalainen, Markus K H Malo, Sari Venesmaa, Pirjo Käkelä, Jussi Pihlajamäki, Pasi A Karjalainen, Jari P Arokoski, Rami Korhonen
The objective of the study was to investigate the effect of bariatric surgery-induced weight loss on knee gait and cartilage degeneration in osteoarthritis by combining magnetic resonance imaging, gait analysis, finite element modeling and cartilage degeneration algorithm. Gait analyses were performed for obese subjects before and one-year after the bariatric surgery. Finite element models were created before and after weight loss for those subjects who had not severe tibio-femoral knee cartilage loss. Knee cartilage degenerations were predicted using an adaptive cartilage degeneration algorithm which is based on cumulative overloading of cartilage, leading to iteratively altered cartilage properties during osteoarthritis...
November 3, 2017: Journal of Biomechanical Engineering
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