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Hamstring Strain

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https://www.readbyqxmd.com/read/28895622/sciatic-nerve-conductivity-is-impaired-by-hamstring-strain-injuries
#1
Karina Kouzaki, Koichi Nakazato, Masuhiko Mizuno, Tooru Yonechi, Yusuke Higo, Yoshiaki Kubo, Tokuyoshi Kono, Kenji Hiranuma
The aim of this study was to assess sciatic nerve conductivity in athletes with a history of hamstring strain injuries. Twenty-seven athletes with a history of hamstring strain injuries were included in the injured group. The control group consisted of 16 uninjured participants. We measured the proximal and distal latencies and calculated the sciatic nerve conduction velocity to evaluate neuronal conductivity. The results were expressed as median values and interquartile ranges. Both proximal latency and distal latency of the injured limb in the injured group were significantly longer than those of the uninjured limb (p<0...
September 11, 2017: International Journal of Sports Medicine
https://www.readbyqxmd.com/read/28884093/hamstring-injuries-update-article
#2
Lucio Ernlund, Lucas de Almeida Vieira
Hamstring (HS) muscle injuries are the most common injury in sports. They are correlated to long rehabilitations and have a great tendency to recur. The HS consist of the long head of the biceps femoris, semitendinosus, and semimembranosus. The patient's clinical presentation depends on the characteristics of the lesion, which may vary from strain to avulsions of the proximal insertion. The most recognized risk factor is a previous injury. Magnetic resonance imaging is the method of choice for the injury diagnosis and classification...
June 2017: Revista Brasileira de Ortopedia
https://www.readbyqxmd.com/read/28866109/a-three-year-epidemiological-prospective-cohort-study-of-rugby-league-match-injuries-from-the-european-super-league
#3
Anna C Fitzpatrick, Adam S Naylor, Peter Myler, Colin Robertson
OBJECTIVES: Conduct a comprehensive epidemiological study of match injury characteristics (incidence, severity, causes, diagnostics, and temporal trends) in professional rugby league. DESIGN: Prospective cohort design. METHODS: Data was captured over the 2013, '14, and '15 seasons, collected via an online-reporting survey tool, and underpinned by nominal group technique-agreed definitions. Injury details were provided by club medical staff in accordance to the survey fields from all European Super League teams (e...
August 24, 2017: Journal of Science and Medicine in Sport
https://www.readbyqxmd.com/read/28825878/injuries-in-australian-rules-football-an-overview-of-injury-rates-patterns-and-mechanisms-across-all-levels-of-play
#4
Richard Saw, Caroline F Finch, David Samra, Peter Baquie, Tanusha Cardoso, Danielle Hope, John W Orchard
CONTEXT: The nature of Australian rules football (Australian football) predisposes both unique and common injuries compared with those sustained in other football codes. The game involves a combination of tackling, kicking, high-speed running (more than other football codes), and jumping. Two decades of injury surveillance has identified common injuries at the professional level (Australian Football League [AFL]). OBJECTIVE: To provide an overview of injuries in Australian rules football, including injury rates, patterns, and mechanisms across all levels of play...
August 1, 2017: Sports Health
https://www.readbyqxmd.com/read/28800920/does-platelet-rich-plasma-lead-to-earlier-return-to-sport-when-compared-with-conservative-treatment-in-acute-muscle-injuries-a-systematic-review-and-meta-analysis
#5
Ujash Sheth, Tim Dwyer, Ira Smith, David Wasserstein, John Theodoropoulos, Sachdeep Takhar, Jaskarndip Chahal
PURPOSE: To compare the time to return to sport and reinjury rate after platelet-rich plasma (PRP) injection versus control therapy (i.e., physiotherapy or placebo injection) in patients with acute grade I or II muscle strains. METHODS: All eligible studies comparing PRP against a control in the treatment of acute (≤7 days) grade I or II muscle strains were identified. The primary outcome was time to return to play. The secondary outcome was the rate of reinjury at a minimum of 6 months of follow-up...
August 8, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28789872/mechanical-analysis-of-extra-articular-knee-ligaments-part-two-tendon-grafts-used-for-knee-ligament-reconstruction
#6
Kristof Smeets, Johan Bellemans, Lennart Scheys, Bert O Eijnde, Joshua Slane, Steven Claes
OBJECTIVES: The aim of this study was to provide information about the mechanical properties of grafts used for knee ligament reconstructions and to compare those results with the mechanical properties of native knee ligaments. METHODS: Eleven cadaveric knees were dissected for the semitendinosus, gracilis, iliotibial band (ITB), quadriceps and patellar tendon. Uniaxial testing to failure was performed using a standardized method and mechanical properties (elastic modulus, ultimate stress, ultimate strain, strain energy density) were determined...
August 5, 2017: Knee
https://www.readbyqxmd.com/read/28772319/imaging-of-acute-hamstring-muscle-strain-injuries
#7
Simon Dimmick, James M Linklater
No abstract text is available yet for this article.
September 2017: Seminars in Musculoskeletal Radiology
https://www.readbyqxmd.com/read/28760374/ropivacaine-alters-the-mechanical-properties-of-hamstring-tendons-in-vitro-controlled-mechanical-testing-of-tendons-from-living-donors
#8
Matthieu Ollivier, Jaafar Sbihi, Abderrahmane Sbihi, Martine Pithioux, Sebastien Parratte, Jean-Noel Argenson
OBJECTIVE: Intra-articular or peri-articular injection of ropivacaine (RI) is an element of current knee surgery practices. The goal of this study was to determine the effects of RI on the mechanical properties of hamstring tendons. METHODS: A tensile test to failure was performed on 120 hamstring tendon segments harvested during ACL reconstruction surgery in 120 patients. Two sets of tensile tests were done. The first evaluated the effect of RI itself on the mechanical properties of tendons: 30 samples were soaked for 1 hour in a 2% RI solution and compared to 30 samples soaked in a saline solution (control group)...
July 28, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28717620/the-influence-of-muscle-tendon-forces-on-acl-loading-during-jump-landing-a-systematic-review
#9
REVIEW
Katja Oberhofer, S H Hosseini Nasab, Pascal Schütz, Barbara Postolka, Jess G Snedeker, William R Taylor, Renate List
BACKGROUND: The goal of this review is to summarise and discuss the reported influence of muscle-tendon forces on anterior cruciate ligament (ACL) loading during the jump-landing task by means of biomechanical analyses of the healthy knee. METHODS: A systematic review of the literature was conducted using different combinations of the terms "knee", "ligament", "load", "tension ", "length", "strain", "elongation" and "lengthening". 26 original articles (n=16 in vitro studies; n=10 in situ studies) were identified which complied with all inclusion/exclusion criteria...
January 2017: Muscles, Ligaments and Tendons Journal
https://www.readbyqxmd.com/read/28714762/effectiveness-of-prp-injection-in-reducing-recovery-time-of-acute-hamstring-injury-a-critically-appraised-topic
#10
Mary Lynn Manduca, Stephen J Straub
Clinical Scenario Hamstring strains are common athletic injuries, with a high recurrence rate (34%).(2) Recently, platelet-rich-plasma (PRP) injections have gained popularity as a potential treatment option to accelerate healing of hamstring injury.(3) Focused Clinical Question Does the combination of PRP injection and rehabilitation decrease recovery time of acute hamstring injury as compared to rehabilitation alone in collegiate athletes? Summary of Key Findings A literature search resulted in three randomized controlled trials (RCT)...
July 17, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28580247/repair-of-proximal-hamstring-tears-a-surgical-technique
#11
Gilbert Moatshe, Jorge Chahla, Alexander R Vap, Marcio Ferrari, George Sanchez, Justin J Mitchell, Robert F LaPrade
Proximal hamstring tears are among the most common sports-related injuries. These injuries often occur as strains or partial tears at the proximal muscle belly or the musculotendinous junction, with avulsion injuries of the proximal attachment occurring less frequently. Regardless of the mechanism, they produce functional impairment and negatively affect an athlete's performance. Various classifications for these injuries are reported in the literature. Early surgical treatment is recommended for patients with either a 2-tendon tear/avulsion with more than 2 cm retraction or those with complete 3-tendon tears...
April 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28573973/knee-flexion-with-quadriceps-cocontraction-a-new-therapeutic-exercise-for-the-early-stage-of-acl-rehabilitation
#12
Andrea Biscarini, Samuele Contemori, Daniele Busti, Fabio M Botti, Vito E Pettorossi
Quadriceps strengthening exercises designed for the early phase of anterior cruciate ligament (ACL) rehabilitation should limit the anterior tibial translation developed by quadriceps contraction near full knee extension, in order to avoid excessive strain on the healing tissue. We hypothesize that knee-flexion exercises with simultaneous voluntary contraction of quadriceps (voluntary quadriceps cocontraction) can yield considerable levels of quadriceps activation while preventing the tibia from translating forward relative to the femur...
December 8, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/28549817/static-tensioning-promotes-hamstring-tendons-force-relaxation-more-reliably-than-cycling-tensioning
#13
Sérgio Rocha Piedade, Inácio Maria Dal Fabbro, Martha Maria Mischan, Cezar Piedade, Nicola Maffulli
BACKGROUND: Graft elongation might be a major reason for increased anterior laxity after anterior cruciate ligament (ACL) reconstruction. This study analyzed the force relaxation values and their stabilization when single strands of the gracilis and semitendinosus tendons underwent cyclic and static tensioning at 2.5% strain level, and compared the efficiency of static and cyclic tensioning in promoting force relaxation. METHODS: Eighteen gracilis tendons and 18 semitendinosus tendons from nine male cadavers (mean age: 22...
May 23, 2017: Knee
https://www.readbyqxmd.com/read/28536977/finite-element-simulations-of-different-hamstring-tendon-graft-lengths-and-related-fixations-in-anterior-cruciate-ligament-reconstruction
#14
Chao Wan, Zhixiu Hao, Zhichang Li, Jianhao Lin
As one of the most frequently used grafts in anterior cruciate ligament (ACL) reconstruction, hamstring tendon (HT) grafts are prepared with different lengths and fixed by specific fixations in knee joints. However, there are incomplete studies to investigate both the joint kinematics and graft biomechanics in the ACL reconstructions with different HT graft lengths. In this paper, three different graft lengths (i.e., 30, 50, and 70 mm) were developed in the ACL reconstruction and analyzed using finite element method under two usual clinical test loads (i...
May 23, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28459795/four-weeks-of-nordic-hamstring-exercise-reduce-muscle-injury-risk-factors-in-young-adults
#15
João Breno de A R Alvares, Vanessa Bernardes Marques, Marco Aurélio Vaz, Bruno Manfredini Baroni
The Nordic hamstring exercise (NHE) is a field-based exercise designed for knee-flexor eccentric strengthening, aimed at muscle strains prevention. However, possible effects of NHE programmes on other hamstring injury risk factors remain unclear. The purpose of this study was to investigate the effects of a NHE training programme on multiple hamstring injury risk factors. Twenty physically active young adults were allocated into two equal sized groups: control group (CG) and training group (TG). The TG was engaged in a 4-week NHE programme, twice a week, 3 sets of 6-10 repetitions; while CG received no exercise intervention...
April 26, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28378509/hamstring-to-quadriceps-fatigue-ratio-offers-new-and-different-muscle-function-information-than-the-conventional-non-fatigued-ratio
#16
M D Pinto, A J Blazevich, L L Andersen, P Mil-Homens, R S Pinto
Commonly used injury risk prediction tests such as the hamstring-to-quadriceps (H:Q) strength ratio appear to be poor predictors of non-contact injury. However, these tests are typically performed in a non-fatigued state, despite accumulated fatigue being an important risk factor for both hamstring strain (HS) and anterior cruciate ligament (ACL) injuries in professional soccer players. After the effect of different H:Q calculation methods were compared and contrasted, the influence of neuromuscular fatigue on the H:Q strength ratio and the association between fatigued and non-fatigued ratio scores were examined...
April 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28378465/cutoffs-of-isokinetic-strength-ratio-and-hamstring-strain-prediction-in-professional-soccer-players
#17
M Dauty, P Menu, A Fouasson-Chailloux
Hamstring strain injuries frequently occur during professional soccer practice. Low hamstring strength represents an intrinsic modifiable risk factor but cutoffs of isokinetic knee strength ratios are controversial to predict hamstring strain in professional soccer players. We aimed to predict hamstring strain in accordance with cutoffs of isokinetic knee strength ratios. Bilateral, conventional, and functional isokinetic strength ratios were calculated in 194 professional soccer players at the beginning of 15 consecutive seasons...
April 4, 2017: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/28322596/motor-imagery-during-action-observation-increases-eccentric-hamstring-force-an-acute-non-physical-intervention
#18
Matthew Scott, Stephen Taylor, Paul Chesterton, Stefan Vogt, Daniel Lloyd Eaves
PURPOSE: Rehabilitation professionals typically use motor imagery (MI) or action observation (AO) to increase physical strength for injury prevention and recovery. Here we compared hamstring force gains for MI during AO (AO + MI) against two pure MI training groups. MATERIALS AND METHODS: Over a 3-week intervention physically fit adults imagined Nordic hamstring exercises in both legs and synchronized this with a demonstration of the same action (AO + MI), or they purely imagined this action (pure MI), or imagined upper-limb actions (pure MI-control)...
March 21, 2017: Disability and Rehabilitation
https://www.readbyqxmd.com/read/28282673/five-strand-versus-four-strand-hamstring-tendon-graft-technique-for-anterior-cruciate-ligament-reconstruction-a-biomechanical-comparison
#19
Eric R Vaillant, Brent G Parks, Lyn M Camire, Richard Y Hinton
The aim of this article is to compare diameter and stiffness, displacement, and strain in a five-strand versus four-strand hamstring graft for anterior cruciate ligament reconstruction. Eight matched pairs of lower extremities underwent four-strand or five-strand hamstring graft reconstruction. Diameter was significantly higher in the five-strand versus the four-strand construct (p = 0.002). No significant difference was found between the groups in construct displacement or stiffness. Significantly higher strain was observed in the inner limb versus the outer limb in the four-strand construct (p = 0...
March 10, 2017: Journal of Knee Surgery
https://www.readbyqxmd.com/read/28280975/the-effect-of-nordic-hamstring-strength-training-on-muscle-architecture-stiffness-and-strength
#20
RANDOMIZED CONTROLLED TRIAL
Kayla D Seymore, Zachary J Domire, Paul DeVita, Patrick M Rider, Anthony S Kulas
PURPOSE: Hamstring strain injury is a frequent and serious injury in competitive and recreational sports. While Nordic hamstring (NH) eccentric strength training is an effective hamstring injury-prevention method, the protective mechanism of this exercise is not understood. Strength training increases muscle strength, but also alters muscle architecture and stiffness; all three factors may be associated with reducing muscle injuries. The purpose of this study was to examine the effects of NH eccentric strength training on hamstring muscle architecture, stiffness, and strength...
May 2017: European Journal of Applied Physiology
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