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(Anterior cruciate ligament) AND (quadriceps activation)

Tjerk Zult, Alli Gokeler, Jos J A M van Raay, Reinoud W Brouwer, Inge Zijdewind, Tibor Hortobágyi
PURPOSE: The function of the anterior cruciate ligament (ACL) patients' non-injured leg is relevant in light of the high incidence of secondary ACL injuries on the contralateral side. However, the non-injured leg's function has only been examined for a selected number of neuromuscular outcomes and often without appropriate control groups. We measured a broad array of neuromuscular functions between legs of ACL patients and compared outcomes to age, sex, and physical activity matched controls...
September 24, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
Mark Tyler Cavanaugh, Saied Jalal Aboodarda, David George Behm
The objective of this study was to develop a standardized test to determine quadriceps and hamstrings muscle activation in a position emulating a non-contact anterior cruciate ligament injury. We assessed the intra- and inter-session reliability of surface electromyography (EMG) of the dominant leg following single-leg landing from a standardized hurdle jump. Eighteen subjects (10 males, 8 females) participated in four repeated sessions. During each session, individuals performed three successful jumps over a hurdle set to 75% of their maximal countermovement jump height and landed on their dominant leg...
September 6, 2016: Journal of Strength and Conditioning Research
Yuya Ueda, Takehiko Matsushita, Daisuke Araki, Akihiro Kida, Kohei Takiguchi, Yohei Shibata, Kumiko Ono, Rei Ono, Tomoyuki Matsumoto, Koji Takayama, Yoshitada Sakai, Masahiro Kurosaka, Ryosuke Kuroda
PURPOSE: Patients typically return to sports activities 6-12 months after anterior cruciate ligament (ACL) reconstruction, and quadriceps strength has been used as one of the criteria to return to sports activities. The purpose of this study is to identify the factors that affect quadriceps strength recovery after ACL reconstruction with a hamstring tendon autograft 6 months after surgery. METHODS: Isokinetic quadriceps strength at 60°/s was measured preoperatively and 6 months after surgery in 193 athletes who underwent ACL reconstruction with a hamstring tendon autograft...
August 23, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
Matthew J Jordan, Per Aagaard, Walter Herzog
PURPOSE: The acute effects of fatigue on functional inter-limb asymmetry and quadriceps/hamstring muscle activity levels including preparatory co-activation during squat jump takeoff and landing was evaluated in elite alpine ski racers with/without anterior cruciate ligament (ACL) reconstruction (ACLR). METHODS: Twenty-two elite ski racers (ACLR: n=11; Control: n=11) performed an 80-second repeated squat jump test (jump-test) on a dual force plate system with simultaneous electromyography (EMG) recordings in vastus lateralis (VL), vastus medialis (VM), semitendinosus (ST) and biceps femoris (BF)...
August 17, 2016: Medicine and Science in Sports and Exercise
Gulcan Harput, Burak Ulusoy, Hamza Ozer, Gul Baltaci, Jim Richards
BACKGROUND: The objectives of this study were to investigate the effects of knee brace (KB) and kinesiotaping (KT) on functional performance and self-reported function in individuals six months post-ACLR who desired to return to their pre-injury activity levels but felt unable to do so due to kinesiophobia. METHODS: This was a cross-sectional study involving 30 individuals six months post-ACLR with Tampa Kinesiophobia Scores >37. Individuals were tested under three conditions: no intervention, KB and KT in a randomized order...
October 2016: Knee
Matthew S Harkey, Brittney A Luc-Harkey, Adam S Lepley, Terry L Grindstaff, Phillip Gribble, J Troy Blackburn, Jeffrey T Spang, Brian Pietrosimone
PURPOSE: Persistent voluntary quadriceps activation deficits are common following anterior cruciate ligament reconstruction (ACLR), but the direct causes are unclear. The primary purpose of this study was to determine whether spinal reflex excitability deficits are present in individuals with a history of ACLR, and secondarily to determine if spinal reflex excitability predicts which individuals possess full voluntary quadriceps activation. METHODS: One hundred and forty-seven individuals (74 Healthy and 73 ACLR) participated in this cross-sectional, case-control study...
July 18, 2016: Medicine and Science in Sports and Exercise
Juan Antonio Luque-Seron, Ivan Medina-Porqueres
CONTEXT: Distinct exercises have been proposed for knee rehabilitation after anterior cruciate ligament (ACL) reconstruction. There is a need to understand ACL strain behavior during different rehabilitation exercises to protect the graft from excessive strain that could interfere with its healing process. OBJECTIVE: To critically review studies that directly measured normal ACL strain in vivo during different movements, conditions, or exercises to gain insight into which of them may produce more strain on the ligament or the ligament graft in the case of reconstructed knees...
September 2016: Sports Health
Joon Kyu Lee, Sahnghoon Lee, Myung Chul Lee
BACKGROUND: The choice of graft type is an important factor to the outcome of anterior cruciate ligament (ACL) reconstruction. PURPOSE: To compare knee joint stability and functional outcomes of anatomic ACL reconstruction with double-bundle hamstring tendon (DBHT) and bone-quadriceps tendon (BQT) autografts. STUDY DESIGN: Cohort study; Level of evidence, 3. METHODS: Ninety-six patients underwent ACL reconstruction with either DBHT (hamstring group) or BQT autograft (quadriceps group)...
September 2016: American Journal of Sports Medicine
Robert A Magnussen, Kristy Pottkotter, Stephanie Di Stasi, Mark V Paterno, Samuel C Wordeman, Laura C Schmitt, David C Flanigan, Christopher C Kaeding, Timothy E Hewett
Femoral nerve block (FNB) has been proposed for pain control following anterior cruciate ligament (ACL) reconstruction. Although numerous studies have assessed the efficacy of FNBs, there has been little to no research into the effect of such blocks on postoperative strength and patient-reported outcomes. We hypothesized that performance of an FNB would result in decreased quadriceps strength and poorer patient-reported outcome scores within the first 6 months following ACL reconstruction. A total of 30 patients scheduled to undergo hamstring autograft ACL reconstruction following an acute ACL injury were randomized to a single-shot FNB group or a control group...
June 30, 2016: Journal of Knee Surgery
Brittney Luc, Matthew Harkey, J Troy Blackburn, Rebecca Kim, Troy Royal, Brian Pietrosimone
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Marco Jacopetti, Andrea Pasquini, Cosimo Costantino
BackgroundThe anterior cruciate ligament (ACL) rupture accounting for about 50% of all knee ligament injuries. The rehabilitation program requires a long time to rebuild muscle strength and to reestablish joint mobility and neuromuscular control. The purpose of the study is to evaluate the muscle strength recovery in athletes with ACL reconstruction. MethodsWe enrolled soccer atlethes, with isolated anterior cruciate ligament rupture treated with bone-patellar tendon-bone autograft artroscopic reconstruction...
2016: Acta Bio-medica: Atenei Parmensis
J Troy Blackburn, Brian Pietrosimone, Matt S Harkey, Brittney A Luc, Derek N Pamukoff
PURPOSE: Chronic quadriceps dysfunction has been implicated as a contributor to knee osteoarthritis (OA) development after anterior cruciate ligament reconstruction (ACLR). This dysfunction potentially leads to impulsive/high-rate loading during gait, thus accelerating cartilage degradation. The purpose of this study was to examine relationships between several indices of quadriceps function and gait biomechanics linked to knee OA development in individuals with ACLR. METHODS: Gait biomechanics and quadriceps function were assessed in 39 individuals with ACLR...
September 2016: Medicine and Science in Sports and Exercise
Rachel M Frank, Hannah Lundberg, Markus A Wimmer, Brian Forsythe, Bernard R Bach, Nikhil N Verma, Brian J Cole
PURPOSE: To investigate the potential causes of diminished knee extension after acute anterior cruciate ligament (ACL) injury using both surface electromyography (sEMG) analysis of the quadriceps and hamstrings, and gait analysis to assess muscle action and tone. METHODS: Consecutive patients with an acute ACL tear underwent sEMG and gait analysis within 2 weeks of injury, before ACL reconstruction. Standard motion analysis techniques were used and sEMG data were collected simultaneously with gait data...
August 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
M Severyns, G Lucas, R Jallageas, S Briand, G Odri, B Fraisse, S Marleix, P Rochcongar, P Violas
INTRODUCTION: The over-the-top position of the femoral metaphyseal tunnel during extraphyseal ligament reconstruction of the anterior cruciate ligament (ACL) according to Clocheville may be responsible for negative anisometry. Until now, the follow-up of children operated using this pediatric technique was limited to screening for iatrogenic epiphysiodesis and the search for postoperative clinical instability. The objective of this study was to measure residual laxity using objective tests, to quantify muscle recovery, and to evaluate the quality of life of these patients in terms of the sports activities...
June 2016: Orthopaedics & Traumatology, Surgery & Research: OTSR
Joshua T Weinhandl, Matthew C Hoch, Sebastian Y Bawab, Stacie I Ringleb
Computer modeling and simulation techniques have been increasingly used to investigate anterior cruciate ligament (ACL) loading during dynamic activities in an attempt to improve our understanding of injury mechanisms and development of injury prevention programs. However, the accuracy of many of these models remains unknown and thus the purpose of this study was to compare estimates of ACL strain from a previously developed three-dimensional, data-driven model with those obtained via in vitro measurements...
November 2016: Computer Methods in Biomechanics and Biomedical Engineering
Nicola Angelo Maffiuletti, Marco Barbero, Corrado Cescon, Ron Clijsen, Matteo Beretta-Piccoli, Alessandro Schneebeli, Stefan Preiss, Danilo Togninalli
This study examined the validity of the twitch interpolation technique for evaluating side-to-side asymmetries in quadriceps neuromuscular function. Fifty-six subjects with a wide range of asymmetries (19 healthy, 24 with unilateral and 13 with bilateral anterior cruciate ligament reconstruction) took part in the study. Supramaximal electrical paired stimuli were delivered to the quadriceps muscle during and immediately after a maximal voluntary contraction (MVC) of the knee extensors (twitch interpolation technique)...
June 2016: Journal of Electromyography and Kinesiology
May Arna Risberg, Britt Elin Oiestad, Ragnhild Gunderson, Arne Kristian Aune, Lars Engebretsen, Adam Culvenor, Inger Holm
BACKGROUND: Progression of tibiofemoral (TF) and patellofemoral (PF) osteoarthritis (OA) and changes in knee function more than 15 years after anterior cruciate ligament reconstruction (ACLR) are not well understood. PURPOSE: To examine the progression of knee OA and changes in symptoms and function in isolated and combined injuries from 15 to 20 years after ACLR. STUDY DESIGN: Cohort study; Level of evidence, 2. METHODS: A total of 210 subjects with ACLR were prospectively followed...
May 2016: American Journal of Sports Medicine
Derek N Pamukoff, Brian Pietrosimone, Michael D Lewek, Eric D Ryan, Paul S Weinhold, Dustin R Lee, J Troy Blackburn
OBJECTIVE: To determine the immediate effects of a single session of whole-body vibration (WBV) and local muscle vibration (LMV) on quadriceps function in individuals with anterior cruciate ligament reconstruction (ACLR). DESIGN: Singe-blind, randomized crossover trial. SETTING: Research laboratory. PARTICIPANTS: Population-based sample of individuals with ACLR (N=20; mean age ± SD, 21.1±1.2y; mean mass ± SD, 68.3±14...
July 2016: Archives of Physical Medicine and Rehabilitation
Terese L Chmielewski, Steven Z George, Susan M Tillman, Michael W Moser, Trevor A Lentz, Peter A Indelicato, Troy N Trumble, Jonathan J Shuster, Flavia M Cicuttini, Christiaan Leeuwenburgh
BACKGROUND: Plyometric exercise is used during rehabilitation after anterior cruciate ligament (ACL) reconstruction to facilitate the return to sports participation. However, clinical outcomes have not been examined, and high loads on the lower extremity could be detrimental to knee articular cartilage. PURPOSE: To compare the immediate effect of low- and high-intensity plyometric exercise during rehabilitation after ACL reconstruction on knee function, articular cartilage metabolism, and other clinically relevant measures...
March 2016: American Journal of Sports Medicine
Luke Perraton, Ross Clark, Kay Crossley, Yong-Hao Pua, Tim Whitehead, Hayden Morris, Stacey Telianidis, Adam Bryant
PURPOSE: Impairments in quadriceps force control and altered quadriceps and hamstring muscle activation strategies have been observed following anterior cruciate ligament reconstruction; however, the functional implications of these impairments are unclear. This study examined the cross-sectional associations between quadriceps force control, quadriceps activation, hamstring coactivation and clinically assessed knee function following anterior cruciate ligament reconstruction with a hamstring graft...
January 8, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
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