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https://www.readbyqxmd.com/read/29922375/changes-in-injury-risk-mechanisms-after-soccer-specific-fatigue-in-male-youth-soccer-players
#1
Michal Lehnert, Mark De Ste Croix, Zuzana Xaverova, Michal Botek, Renata Varekova, Amr Zaatar, Ondrej Lastovicka, Petr Stastny
The aim of this study was to examine the acute effects of soccer specific fatigue on muscular and neuromuscular function in male youth soccer players. Elite soccer players (n = 20; age 15.7 ± 0.5 y; body height 177.75 ± 6.61 cm; body mass 67.28 ± 8.29 kg) were measured before and after soccer specific exercise (SAFT90 ). The reactive strength index (RSI) was determined by a drop jump test, leg stiffness (LS) by a 20 sub-maximal two-legged hopping test, and a functional hamstring to quadriceps strength ratio from isokinetic concentric and eccentric strength of the dominant and non-dominant leg (measured at angular velocities of 1...
June 2018: Journal of Human Kinetics
https://www.readbyqxmd.com/read/29914739/toe-in-and-toe-out-walking-require-different-lower-limb-neuromuscular-patterns-in-people-with-knee-osteoarthritis
#2
Jesse M Charlton, Gillian L Hatfield, Jordan A Guenette, Michael A Hunt
Toe-in and toe-out gait modification has received attention lately as a promising treatment for knee osteoarthritis due to its potential to improve knee joint loading and pain. However, the neuromuscular patterns associated with these walking styles are not well known, a factor that may influence knee joint load itself. Our aim was to conduct a thorough examination of the neuromuscular patterns associated with toe-in and toe-out walking in people with knee osteoarthritis. Fifteen participants were instructed to walk in four different foot rotations: 10° toe-in, 0°, as well as 10° and 20° toe-out...
June 15, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/29914236/radiological-and-functional-comparison-of-single-bundle-anterior-cruciate-ligament-reconstruction-transtibial-versus-anteromedial-technique
#3
Mustafa Özer, Hamza Özer, Hakan Selek, Gül Baltacı, Gülcan Harput, Anıl Taşkesen, Mehmet Çetinkaya
Background/aim: This study aimed to compare radiological and functional outcomes of patients who had single-bundle anterior cruciate ligament (ACL) reconstruction with autologous hamstring tendon grafts using transtibial (TT) versus anteromedial (AM) femoral tunnel drilling techniques. Materials and methods: Sixty patients who had been operated on between 2010 and 2013 were enrolled in this study. Tunnel positions and widenings in the femur and tibia were evaluated with radiographs, arthrometric measurements with a Rolimeter arthrometer (Aircast, Summit, NJ, USA), stability assessment with Lachman and reverse pivot shift tests, and functional assessment with the International Knee Documentation Committee and Tegner and Lysholm scoring systems...
June 14, 2018: Turkish Journal of Medical Sciences
https://www.readbyqxmd.com/read/29914231/what-is-the-cutoff-values-for-the-diagnosis-of-hamstring-shortness-and-related-factors-that-affect-their-results
#4
Muhammed Şeref Yıldırım, Filiz Tuna, Derya Demirbağ Kabayel, Necdet Süt
Background: Decreased hamstring flexibility is associated with many pathological conditions. For this reason, hamstrings are one of the most frequently evaluated muscle groups for flexibility in the lower extremity. Muscle flexibility is evaluated indirectly by measuring adjacent joint range of motion. Passive and active knee extension angle values are used as an indirect indicator of hamstring flexibility. But the results of the active knee extension test are claimed to be influenced by subject’s quadriceps strength...
June 19, 2018: Balkan Medical Journal
https://www.readbyqxmd.com/read/29912857/stretch-could-reduce-hamstring-injury-risk-during-sprinting-by-right-shifting-the-length-torque-curve
#5
Mianfang Ruan, Li Li, Chen Chen, Xie Wu
Ruan, M, Li, L, Chen, C, and Wu, X. Stretch could reduce hamstring injury risk during sprinting by right shifting the length-torque curve. J Strength Cond Res XX(X): 000-000, 2018-It was hypothesized that static stretch would shift the length-torque curve to the right, which may reduce the risk of muscle strain injuries. The purpose of this study was to evaluate the acute effects of static stretching of hamstring (SSH) on the risk of hamstring injury during sprinting indicated by the shift of the length-torque relationship...
June 15, 2018: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/29912617/is-it-possible-to-voluntarily-increase-hamstring-muscle-activation-during-landing-from-a-snow-jump-in-alpine-skiing-a-pilot-study
#6
Sebastian Färber, Dieter Heinrich, Inge Werner, Peter Federolf
Activation of the hamstrings has been discussed as a measure for reducing strain on the ACL during jump landings in alpine skiing. The current study tested the hypothesis that hamstring and quadriceps activation can be voluntarily increased by the athlete. Specifically, two different instructions - to increase hamstring activation or to increase upper-leg co-contraction - were compared to normal landings. Eight members of the German national and junior national squad in freestyle skiing (age 19.6 ± 3.8 years; weight 66...
June 18, 2018: Journal of Sports Sciences
https://www.readbyqxmd.com/read/29911132/the-clinical-outcome-of-one-stage-high-tibial-osteotomy-and-anterior-cruciate-ligament-reconstruction-a-current-concept-systematic-and-comprehensive-review
#7
REVIEW
Michael-Alexander Malahias, Omid Shahpari, Maria-Kyriaki Kaseta
Background: Patients with an anterior cruciate ligament-deficient varus-angulated knee may need not only an isolated high tibial osteotomy (HTO), but also an additional anterior cruciate ligament reconstruction (ACLR). A number of prospective clinical trials have been published considering the combination of HTO and ACL reconstruction. Our aim was to investigate whether one-stage combined HTO and ACL reconstruction is an effective, well-established technique with long-term results in the treatment of varus-angulated knees with ACL deficiency...
May 2018: Archives of Bone and Joint Surgery
https://www.readbyqxmd.com/read/29911081/comparative-analysis-of-quadriceps-and-hamstrings-strength-in-knee-osteoarthritis-before-and-after-total-knee-arthroplasty-a-cross-sectional-study
#8
Naasson Trindade Cavanellas, Victor Rodrigues Amaral Cossich, Eduardo Becker Nicoliche, Marilena Bezerra Martins, Eduardo Branco de Sousa, José Inácio Salles
Objective: Compare the maximal isokinetic muscle strength of knee extensor and flexor muscles between patients with knee osteoarthritis and patients submitted to total knee arthroplasty. Methods: Volunteers were divided into five groups ( n  = 20): Control; Ahlbäck I and II; Ahlbäck IV; six months after total knee arthroplasty; 12 months after total knee arthroplasty. An isokinetic knee strength evaluation was conducted for the quadriceps and hamstrings at 60°/s...
March 2018: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/29910339/analysis-of-the-relationship-between-elite-wrestlers-leg-strength-and-balance-performance-and-injury-history
#9
Sezen Çimen Polat, Celal Bulgay, İmdat Yarım, Halil İbrahim Cicioğlu, Ebru Çetin
The purpose of this study is to examine the correlation between leg power and balance performance in elite wrestlers and injury history. In the research group, there are 18 elite freestyle male wrestlers at the ages of 24.27 ± 3.18 years, with a height of 171.86 ± 5.44 cm and a body weight of 79.27 ± 11.16 kg. Information on the injury history of the athletes’ upper legs for the past year was collected via interviews with the club’s physiotherapist. Laboratory tests to measure performance assessed height, body weight, Y balance and isokinetic leg strength...
April 17, 2018: Sports
https://www.readbyqxmd.com/read/29910328/duration-dependent-effect-of-static-stretching-on-quadriceps-and-hamstring-muscle-force
#10
Leyla Alizadeh Ebadi, Ebru Çetin
The aim of this study was to determine the acute effect of static stretching on hamstring and quadriceps muscles' isokinetic strength when applied for various durations to elite athletes, to investigate the effect of different static stretching durations on isokinetic strength, and finally to determine the optimal stretching duration. Fifteen elite male athletes from two different sport branches (10 football and five basketball) participated in this study. Experimental protocol was designed as 17 repetitive static stretching exercises for hamstring and quadriceps muscle groups according to the indicated experimental protocols; ((A) 5 min jogging; (B) 5 min jogging followed by 15 s static stretching; (C) 5 min jogging followed by 30 s static stretching; (D) 5 min jogging, followed by static stretching for 45 s)...
March 13, 2018: Sports
https://www.readbyqxmd.com/read/29909296/anterior-cruciate-ligament-reconstruction-with-the-tape-locking-screw-tls-and-a-short-hamstring-graft-clinical-evaluation-of-61-cases-with-a-minimum-12-months-follow-up
#11
Benoît Orfeuvre, Régis Pailhé, Loïc Sigwalt, Brice Rubens Duval, Gabriel Lateur, Stéphane Plaweski, Dominique Saragaglia
INTRODUCTION: The TLS® technique for anterior cruciate ligament (ACL) reconstruction has the advantages of using only one hamstring tendon (semitendinosus) by preparing a short graft secured with screws and braided strips. The theoretical pitfall of this technique is that the graft length is determined arbitrarily. Thus, if the blind tunnels are not long enough, it will be impossible to tension the graft properly upon fixation. The primary objective of this study was to determine the postoperative side-to-side difference in knee laxity...
June 14, 2018: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/29904897/anterior-cruciate-ligament-repair-past-present-and-future
#12
REVIEW
Piyush Mahapatra, Saman Horriat, Bobby S Anand
BACKGROUND: This article provides a detailed narrative review on the history and current concepts surrounding ligamentous repair techniques in athletic patients. In particular, we will focus on the anterior cruciate ligament (ACL) as a case study in ligament injury and ligamentous repair techniques. PubMed (MEDLINE), EMBASE and Cochrane Library databases for papers relating to primary anterior cruciate ligament reconstruction were searched by all participating authors. All relevant historical papers were included for analysis...
June 15, 2018: Journal of Experimental Orthopaedics
https://www.readbyqxmd.com/read/29902124/muscle-activation-in-suspension-training-a-systematic-review
#13
Joan Aguilera-Castells, Bernat Buscà, Azahara Fort-Vanmeerhaeghe, Alicia M Montalvo, Javier Peña
Suspension training is an adjunct to traditional strength and conditioning. The effect of added instability on muscle activation during traditional exercises is unclear and depends on the exercise and type of instability. The purpose of this review was to compare the activations of different muscles in suspension training exercises and their traditional counterparts. A search of the current literature was performed without language restrictions using the electronic databases PubMed (1969-12 January 2017), SPORTDiscus (1969-12 January 2017) and Scopus (1969-12 January 2017)...
June 14, 2018: Sports Biomechanics
https://www.readbyqxmd.com/read/29900181/use-of-posterior-hamstring-harvest-during-anterior-cruciate-ligament-reconstruction-in-the-pediatric-and-adolescent-population
#14
Krishn Khanna, Abhinav Janghala, Nirav K Pandya
Background: Posterior hamstring harvest has been described in the adult population in a limited fashion, but no study is available describing the use of posterior hamstring harvest in an active pediatric and adolescent cohort. At times, surgeons may be faced with a challenging anterior harvest due to patient anatomic characteristics, particularly the anatomic features and size of the pes tendons. Clinicians need to have multiple harvest approaches at their disposal. Complications with hamstring harvest such as premature graft transection are more problematic in this population due to higher failure rates with allograft tissue...
June 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29898473/the-effect-of-remnant-tissue-preservation-in-anatomic-double-bundle-acl-reconstruction-on-knee-stability-and-graft-maturation
#15
Tsuneari Takahashi, Masashi Kimura, Keiichi Hagiwara, Takashi Ohsawa, Katsushi Takeshita
Several investigators have developed anterior cruciate ligament reconstructions (ACLR) with remnant tissue preservation (RTP) and have reported better clinical outcomes. However, the effects of RTP remain controversial. To date, no reports have compared both clinical and radiological outcomes of anatomic double-bundle ACLR using the hamstring tendon and outside-in technique with/without RTP. This article evaluates the effectiveness of RTP in ACLR on knee stability and graft maturation. In total, 75 patients with unilateral ACL injury who had undergone anatomic double-bundle ACLR using autografted hamstring tendon either with RTP (Group P, n  = 43) or without (Group N, n  = 32) were enrolled...
June 13, 2018: Journal of Knee Surgery
https://www.readbyqxmd.com/read/29896023/comparison-of-outcome-after-acl-reconstruction-in-terms-of-subjective-assessment-of-symptoms-and-function-and-clinical-assessment-of-ligament-stability
#16
Abhinav Bhardwaj, Narender Singh Solanki, Hemant Jain, Kishore Raichandani, Surbhi Raichandani, Vistasp Daruwalla
Background: The knee joint is frequently involved in sports and other injuries with Anterior cruciate ligament being a very common ligament to be injured. The Lachman test, pivot-shift test, and instrumented knee laxity examination are frequently used and reported for evaluation of ACL reconstruction. The aim of this study is to examine and evaluate the relationships between the clinical assessment of ligament stability and subjective assessment of symptoms and function after ACL reconstruction...
April 2018: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/29896021/functional-outcome-of-an-early-anterior-cruciate-ligament-reconstruction-in-comparison-to-delayed-are-we-waiting-in-vain
#17
Rajeev Raj Manandhar, Karthik Chandrashekhar, Vinay Kumaraswamy, Santosh Sahanand, David Rajan
Background: Surgical techniques of ACL reconstruction (ACLR) have evolved over the past three decades along with debate regarding timing of reconstruction. It was a widespread belief that the timing of surgery was an important factor in determining the resulting stiffness after ACLR. Delayed rather than early reconstruction of the ACL is the current recommended treatment since it is thought to give a better functional outcome. However, there is no consensus in the literature regarding the optimal time of surgical intervention...
April 2018: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/29892511/effect-of-acute-augmented-feedback-on-between-limb-asymmetries-and-eccentric-knee-flexor-strength-during-the-nordic-hamstring-exercise
#18
Wade J Chalker, Anthony J Shield, David A Opar, Evelyne N Rathbone, Justin W L Keogh
Background: Hamstring strain injuries (HSI) are one of the most prevalent and serious injuries affecting athletes, particularly those in team ball sports or track and field. Recent evidence demonstrates that eccentric knee flexor weakness and between limb asymmetries are possible risk factors for HSIs. While eccentric hamstring resistance training, e.g. the Nordic hamstring exercise (NHE) significantly increases eccentric hamstring strength and reduces HSI risk, little research has examined whether between limb asymmetries can be reduced with training...
2018: PeerJ
https://www.readbyqxmd.com/read/29889147/rehabilitation-of-the-surgically-repaired-intramuscular-hamstring-tendon-a-case-report
#19
Simon J Murphy, David J Rennie
No abstract text is available yet for this article.
June 2018: Current Sports Medicine Reports
https://www.readbyqxmd.com/read/29888638/strength-and-conditioning-in-adolescent-female-athletes
#20
Corinne Sommi, Frances Gill, Jeffrey D Trojan, Mary K Mulcahey
OBJECTIVES: Despite evidence that strength and conditioning (S&C) programs decrease injury risk and increase sport performance, young females are rarely offered S&C programs comparable to those of their male counterparts. The purpose of this study was to evaluate the current body of available literature regarding S&C in adolescent female athletes, describe potential benefits, and generate recommendations for S&C programs for female adolescent athletes. METHODS: The systematic review was performed in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines...
June 9, 2018: Physician and Sportsmedicine
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