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(Anterior cruciate ligament) AND (rate of force development)

M Marieswaran, Ishita Jain, Bhavuk Garg, Vijay Sharma, Dinesh Kalyanasundaram
The anterior cruciate ligament is one of the six ligaments in the human knee joint that provides stability during articulations. It is relatively prone to acute and chronic injuries as compared to other ligaments. Repair and self-healing of an injured anterior cruciate ligament are time-consuming processes. For personnel resuming an active sports life, surgical repair or replacement is essential. Untreated anterior cruciate ligament tear results frequently in osteoarthritis. Therefore, understanding of the biomechanics of injury and properties of the native ligament is crucial...
2018: Applied Bionics and Biomechanics
Bo Bregenhof, Uffe Jørgensen, Per Aagaard, Nis Nissen, Mark W Creaby, Jonas Bloch Thorlund, Carsten Jensen, Trine Torfing, Anders Holsgaard-Larsen
BACKGROUND: Anterior cruciate ligament (ACL) reconstruction, using hamstring auto-graft is a common surgical procedure, which often leads to persistent hamstring muscle-strength deficiency and reduced function. The purpose of this randomized controlled trial (RCT) is to investigate the effect of a combined, progressive, strength and neuromuscular exercise intervention on knee muscle strength, functional capacity and hamstring muscle-tendon morphology in ACL-reconstructed patients with persistent hamstring muscle-strength deficiency compared with controls...
January 26, 2018: Trials
Yong-Hao Pua, Benjamin F Mentiplay, Ross A Clark, Jia-Ying Ho
Study Design Prospective cohort. Background Quadriceps strength is associated with hop distance and jump height in persons who have undergone anterior cruciate ligament (ACL) reconstruction. However, it is unknown whether the ability to rapidly generate quadriceps torque in the early phase of recovery is associated with future hopping and jumping performance in this population. Objective To evaluate the prospective associations among quadriceps strength and rate of torque development (RTD) and single-leg hop for distance, vertical jump height, vertical ground reaction force (vGRF), and vertical force loading rate during a landing task in persons who have undergone ACL reconstruction...
November 2017: Journal of Orthopaedic and Sports Physical Therapy
Erin Hartigan, Jennifer Aucoin, Rita Carlson, Melanie Klieber-Kusak, Thomas Murray, Bernadette Shaw, Michael Lawrence
BACKGROUND: Weighted gait increases internal knee extension moment impulses (KEMI) in the anterior cruciate ligament-reconstructed (ACLR) limb; however, limb differences persist. HYPOTHESES: (1) KEMI during normal gait will influence KEMI during weighted gait and (2) peak knee extension (PKE) torque and time to reach PKE torque will predict KEMI during gait tasks. STUDY DESIGN: Descriptive laboratory study. METHODS: Twenty-four women and 14 men completed 3 gait tasks (unweighted, vest, sled) and strength testing after discharge from rehabilitation and clearance to return to sports...
July 2017: Sports Health
Erika Zemková
Recently, resistance exercises performed on an unstable surface have become part of athletic training and rehabilitation. Accordingly, their role in performance and health-oriented strength training has increasingly emerged as a matter of interest to researchers and conditioning specialists. A more pronounced activation of stabilizing muscles is assumed to be the main feature of instability resistance exercises. This assumption has been proven by EMG studies, which have highlighted significantly greater electromyographic activity of trunk-stabilizing muscles during exercises under unstable as compared to stable conditions...
April 2017: Journal of Traditional and Complementary Medicine
Robert Csapo, Ramona Folie, Simona Hosp, Michael Hasler, Werner Nachbauer
OBJECTIVES: This study aimed to investigate temperature-related changes in different neuro-muscular parameters, to elucidate the reasons for the increased likeliness of injuries of the anterior cruciate ligament under cold environmental conditions. DESIGN: Repeated measures study design. METHODS: To induce peripheral cooling of the knee joint and thigh muscles, ten healthy, female subjects underwent 30 min of exposure to a cold environment...
January 2017: Physical Therapy in Sport
Brittney A Luc-Harkey, Matthew S Harkey, Laura E Stanley, J Troy Blackburn, Darin A Padua, Brian Pietrosimone
BACKGROUND: Alterations in mechanical loading following anterior cruciate ligament reconstruction may lead to the development of knee osteoarthritis. Feedback that cues a change in knee kinematics during walking gait may influence mechanical loading, yet it remains unknown if knee kinematics predict kinetics during walking gait. Our aim was to determine if sagittal plane knee kinematics predict kinetics during walking gait in anterior cruciate ligament reconstructed individuals. METHODS: Forty-one individuals with a history of primary, unilateral anterior cruciate ligament reconstruction completed a motion capture walking gait analysis...
November 2016: Clinical Biomechanics
J Troy Blackburn, Brian Pietrosimone, Matt S Harkey, Brittney A Luc, Derek N Pamukoff
Anterior cruciate ligament injury and reconstruction (ACLR) dramatically increase the risk of knee osteoarthritis, but the contributing factors, and therefore the targets for intervention, are poorly understood. Differences in loading characteristics between the ACLR and contralateral limbs during routine activities such as walking may elucidate the mechanical pathogenesis of post-traumatic knee osteoarthritis. Twenty-nine females with ACLR (age=21.7±3.1 years; time since ACL injury=48±41 months) performed walking gait at a self-selected speed from which the overall peak vertical ground reaction force (vGRF) in the first 50% of the stance phase and its linear (slope of the vGRF-time curve) and instantaneous (first time-derivative) loading rates were calculated...
September 6, 2016: Journal of Biomechanics
Brooke A Sanford, John L Williams, Audrey Zucker-Levin, William M Mihalko
BACKGROUND: This bilateral squat study tests whether people with anterior cruciate ligament (ACL) reconstruction have symmetric three-dimensional ground reaction forces (GRFs) and symmetric anterior-posterior (AP) translation rates of the femur with respect to the tibia when compared with healthy control subjects. We hypothesized that there would be no long-term asymmetry in knee kinematics and kinetics in ACL reconstructed subjects following surgery and rehabilitation. METHODS: Position and GRF data were collected on eight ACL reconstructed and eight control subjects during bilateral squat...
October 2016: Knee
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
Dragan M Mirkov, Olivera M Knezevic, Nicola A Maffiuletti, Marko Kadija, Aleksandar Nedeljkovic, Slobodan Jaric
The aim of this study was to assess the effect of a unilateral anterior cruciate ligament reconstruction (ACLR) on maximum voluntary contraction (MVC) and explosive strength of both the involved limb and the uninvolved limb. Nineteen male athletes completed a standard isometric testing protocol 4 months post-ACLR, while 16 healthy participants served as a control group (CG). The explosive strength of the knee extensors and flexors was assessed as RFD obtained from the slope of the force-time curves over various time intervals...
March 2017: Journal of Sports Sciences
Brian Pietrosimone, J Troy Blackburn, Matthew S Harkey, Brittney A Luc, Anthony C Hackney, Darin A Padua, Jeffrey B Driban, Jeffrey T Spang, Joanne M Jordan
BACKGROUND: Individuals who have sustained an anterior cruciate ligament (ACL) injury and undergo ACL reconstruction (ACLR) are at higher risk of developing knee osteoarthritis. It is hypothesized that altered knee loading may influence the underlying joint metabolism and hasten development of posttraumatic knee osteoarthritis. PURPOSE: To explore the associations between serum biomarkers of cartilage metabolism and peak vertical ground-reaction force (vGRF) and vGRF loading rate in the injured and uninjured limbs of individuals with ACLR...
February 2016: American Journal of Sports Medicine
Jesper Bie Larsen, Jean Farup, Martin Lind, Ulrik Dalgas
PURPOSE: To examine potential deficits in muscle strength or functional capacity when comparing (1) an ACL reconstructed group to matched healthy controls, (2) the ACL reconstructed leg to the non-injured leg and (3) the non-injured leg to matched healthy controls, at the time-point of recommended sport return 9-12months post-surgery. METHODS: Sixteen patients (male-female ratio: 9:7) 9-12months post ACL reconstruction and sixteen age and sex matched healthy controls were included...
February 2015: Human Movement Science
Luca Laudani, Arrigo Giombini, Pier Paolo Mariani, Fabio Pigozzi, Andrea Macaluso
OBJECTIVE: The aims of this study were to identify and quantify functional deficits between the involved and the uninvolved limb as early as 1 mo after ACL reconstruction by means of a sit-to-stand movement on two force platforms. DESIGN: Ground reaction forces were measured in 73 patients who underwent ACL reconstruction, 47 with patellar tendon autograft and 26 with hamstring tendon autograft (ACL-H), and in 22 controls, who stood up from a seat as fast as possible...
March 2014: American Journal of Physical Medicine & Rehabilitation
Jiajia Luo, Tovia M Smith, James A Ashton-Miller, John O L DeLancey
The uterine suspensory tissue (UST), which includes the cardinal (CL) and uterosacral ligaments (USL), plays an important role in resisting pelvic organ prolapse (POP). We describe a technique for quantifying the in vivo time-dependent force-displacement behavior of the UST, demonstrate its feasibility, compare data from POP patients to normal subjects previously reported, and use the results to identify the properties of the CL and USL via biomechanical modeling. Fourteen women with prolapse, without prior surgeries, who were scheduled for surgery, were selected from an ongoing study on POP...
February 2014: Journal of Biomechanical Engineering
V Franklin Sechriest, Joseph R Carney, Michael A Kuskowski, James L Haffner, Mollie J Mullen, Dana C Covey
BACKGROUND: After experiencing an unusually high incidence of knee sepsis after anterior cruciate ligament (ACL) reconstruction, we sought to (1) describe how we resolved this problem through temporary discontinuation of the procedure, formation of a multidisciplinary ACL Task Force, systematic investigation of clinical data and institutional care practices, and development and implementation of an evidence-based ACL Clinical Pathway (the Pathway); and (2) report our findings and results...
May 1, 2013: Journal of Bone and Joint Surgery. American Volume
M Kozák, J Gallo, K Langová, M Holinka
PURPOSE OF THE STUDY: Injury to the anterior cruciate ligament (ACL) frequently results in the development of knee instability. This is managed by ACL reconstruction using autogenous or allogeneic grafts. This study presents a comprehensive evaluation of the patients with ACL reconstruction using a tendon allograft harvested from the anterior tibial muscle (ATM). MATERIAL AND METHODS: The group under study comprised 53 patients, 33 men and 20 women, with unilateral ACL reconstruction while the other knee was intact...
2013: Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca
Nicholas Ali, Michael Skipper Andersen, John Rasmussen, D Gordon E Robertson, Gholamreza Rouhi
The central tenet of this study was to develop, validate and apply various individualised 3D musculoskeletal models of the human body for application to single-leg landings over increasing vertical heights and horizontal distances. While contributing to an understanding of whether gender differences explain the higher rate of non-contact anterior cruciate ligament (ACL) injuries among females, this study also correlated various musculoskeletal variables significantly impacted by gender, height and/or distance and their interactions with two ACL injury-risk predictor variables; peak vertical ground reaction force (VGRF) and peak proximal tibia anterior shear force (PTASF)...
2014: Computer Methods in Biomechanics and Biomedical Engineering
Massimo Angelozzi, Marco Madama, Cristiana Corsica, Vittorio Calvisi, Gianfranco Properzi, Steven T McCaw, Angelo Cacchio
STUDY DESIGN: Descriptive, prospective, longitudinal single-cohort study. OBJECTIVE: To investigate the rate of force development to 30% (RFD(30)), 50% (RFD(50)), and 90% (RFD(90)) of maximal voluntary isometric contraction (MVIC) as an adjunct outcome measure for determining readiness for return to sport following an anterior cruciate ligament (ACL) reconstruction. BACKGROUND: One criterion of full recovery following an ACL reconstruction is the ability to achieve 85% or 90% of the maximal strength of the contralateral limb...
September 2012: Journal of Orthopaedic and Sports Physical Therapy
G Strutzenberger, M Braig, S Sell, K Boes, H Schwameder
Different designs of functional knee braces for ACL-injury rehabilitation exist. In addition to the mechanical stabilization provided by rigid shell braces, sleeve braces also address proprioceptive mechanisms, but little is known if this leads to benefits for ACL-deficient subjects. Therefore the aim of this study was to investigate the effect of 2 different functional brace designs (shell and sleeve brace) on functional achievements in ACL-deficient patients. 28 subjects with ACL-ruptured knees performed tests for knee joint laxity, joint position sense, static and dynamic balance and isometric and dynamic lower limb extension strength in non-braced, sleeve braced and shell braced condition...
November 2012: International Journal of Sports Medicine
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