Effects of chronic anterior cruciate ligament deficiency on muscle activation patterns during an abrupt deceleration task

1999 ◽  
Vol 14 (4) ◽  
pp. 247-257 ◽  
Author(s):  
J.R Steele ◽  
J.M.M Brown
Keyword(s):  
Anterior Cruciate Ligament ◽  
Muscle Activation ◽  
Cruciate Ligament ◽  
Activation Patterns ◽  
Anterior Cruciate Ligament Deficiency ◽  
Muscle Activation Patterns ◽  
Anterior Cruciate

scholarly journals Mechanism of anterior cruciate ligament loading during dynamic motor tasks

2020 ◽  
Author(s):  
Azadeh Nasseri ◽  
David G Lloyd ◽  
Adam L Bryant ◽  
Jonathon Headrick ◽  
Timothy Sayer ◽  
...  
Keyword(s):  
Anterior Cruciate Ligament ◽  
Lower Limb ◽  
Muscle Activation ◽  
Sagittal Plane ◽  
Cruciate Ligament ◽  
Three Dimensional ◽  
Whole Body ◽  
Activation Patterns ◽  
Muscle Activation Patterns ◽  
Anterior Cruciate

AbstractThis study determined anterior cruciate ligament (ACL) force and its contributors during a standardized drop-land-lateral jump task using a validated computational model. Healthy females (n=24) who were recreationally active performed drop-land-lateral jump and straight run tasks. Three-dimensional whole-body kinematics, ground reaction forces, and muscle activation patterns from eight lower limb muscles were collected concurrently during both tasks, but only the jump was analyzed computationally, with the run included for model calibration. External biomechanics, muscle-tendon unit kinematics, and muscle activation patterns were used to model lower limb muscle and ACL forces. Peak ACL force (2.3±0.5 BW) was observed at 13% of the stance phase during the drop-land-lateral jump task. The ACL force was primarily developed through the sagittal plane, and muscle was the dominant source of ACL loading. The gastrocnemii and quadriceps were main ACL antagonists (i.e., loaders), while hamstrings were the main ACL agonists (i.e., supporters).

scholarly journals Fatigue’s Lack of Effect on Thigh-Muscle Activity in Anterior Cruciate Ligament–Reconstructed Patients During a Dynamic-Landing Task

2013 ◽  
Vol 22 (2) ◽  
pp. 83-92 ◽  
Author(s):  
Lindsey K. Lepley ◽  
Abbey C. Thomas ◽  
Scott G. McLean ◽  
Riann M. Palmieri-Smith
Keyword(s):  
Anterior Cruciate Ligament ◽  
Outcome Measures ◽  
Muscle Activity ◽  
Muscle Activation ◽  
Cruciate Ligament ◽  
Activation Patterns ◽  
Female Age ◽  
Muscle Activation Patterns ◽  
Anterior Cruciate ◽  
Knee Muscle

Context:As individuals returning to activity after anterior cruciate ligament reconstruction (ACLr) likely experience fatigue, understanding how fatigue affects knee-muscle activation patterns during sport-like maneuvers is of clinical importance. Fatigue has been suggested to impair neuromuscular control strategies. As a result, fatigue may place ACLr patients at increased risk of developing posttraumatic osteoarthritis (OA).Objective:To determine the effects of fatigue on knee-muscle activity post-ACLr.Design:Case control.Setting:University laboratory.Participants:12 individuals 7–10 mo post-ACLr (7 male, 5 female; age 22.1 ± 4.7 y; 1.8 ± 0.1 m; mass 77.7 ± 11.9 kg) and 13 controls (4 male, 9 female; age 22.9 ± 4.3 y; 1.7 ± 0.1 m; mass 66.9 ± 9.8 kg).Interventions:Fatigue was induced via repetitive sets of double-leg squats (n = 8), which were interspersed with sets of single-leg landings (n = 3), until squats were no longer possible.Main Outcome Measures:2 × 2 repeated-measures ANOVA was used to detect the main effects of group (ACLr, control) and fatigue state (prefatigue, postfatigue) on quadriceps:hamstring cocontraction index (Q:H CCI).Results:All subjects demonstrated higher Q:H CCI at prefatigue compared with postfatigue (F1,23 = 66.949, P ≤ .001). Q:H CCI did not differ between groups (F1,23 = 0.599, P = .447).Conclusions:The results indicate that regardless of fatigue state, ACLr individuals are capable of restoring muscle-activation patterns similar to those in healthy subjects. As a result, excessive muscle cocontraction, which has been hypothesized as a potential mechanism of posttraumatic OA, may not contribute to joint degeneration after ACLr.

scholarly journals Motor Control Changes after Innovative Aquatic Proprioceptive Training in Athletes with Anterior Cruciate Ligament Reconstruction: Voluntary Response Index Analysis

2021 ◽  
Vol In Press (In Press) ◽  
Author(s):  
Elie Hajouj ◽  
Mohammad Reza Hadian ◽  
Seyed Mohsen Mir ◽  
Saeed Talebian ◽  
Salah Ghazi
Keyword(s):  
Motor Control ◽  
Muscle Activation ◽  
Cruciate Ligament ◽  
Activation Patterns ◽  
Response Index ◽  
Muscle Activation Patterns ◽  
Voluntary Response ◽  
Proprioceptive Training ◽  
Anterior Cruciate ◽  
Functional Task

Objectives: The main aim of this study was to determine and compare the effects of innovative aquatic proprioceptive training plus conventional rehabilitation with conventional rehabilitation alone on voluntary response index (VRI) components in athletes with anterior cruciate ligament reconstruction (ACLR). Methods: Forty male athletes with ACLR (18 - 35 years of age) voluntarily participated in this study. They were randomly allocated into two groups. The conventional therapy group (n = 20) underwent conventional rehabilitation for ten weeks, three sessions a week. The aquatic proprioceptive training plus conventional rehabilitation (n = 20) group received the same conventional rehabilitation plus 30 sessions of innovative hydrotherapy exercises. Voluntary response index analysis was carried out to determine changes in motor control and muscle activation patterns based on electromyographic (EMG) outcome measures. Results: There was a significant difference in the magnitude (MAG) and similarity index (SI) between the two groups at all phases of the functional task (sit-stand-sit) (P < 0.05). Also, both groups showed a significant change in MAG and SI at all phases of the functional task (sit-stand-sit) after the intervention (P < 0.05). Effect size in both groups for MAG and SI at all phases of the functional task (sit-stand-sit) ranged from 2.5 to 4.61 and from 0.29 to 1.7, respectively. Conclusions: The incorporation of innovative aquatic proprioceptive training into conventional accelerated rehabilitation protocol can improve motor control by influencing muscle activation patterns.

Biceps Femoris Compensates for Semitendinosus After Anterior Cruciate Ligament Reconstruction With a Hamstring Autograft: A Muscle Functional Magnetic Resonance Imaging Study in Male Soccer Players

2021 ◽  
pp. 036354652110033
Author(s):  
Thomas Tampere ◽  
Jan Victor ◽  
Thomas Luyckx ◽  
Hannes Vermue ◽  
Nele Arnout ◽  
...  
Keyword(s):  
Muscle Activation ◽  
Cruciate Ligament ◽  
Biceps Femoris ◽  
Soccer Players ◽  
Hamstring Muscle ◽  
Activation Patterns ◽  
Muscle Activation Patterns ◽  
History Of ◽  
Anterior Cruciate ◽  
Tendon Autograft

Background: Rates of reinjury, return to play (RTP) at the preinjury level, and hamstring strain injuries in male soccer players after anterior cruciate ligament reconstruction (ACLR) remain unsatisfactory, due to multifactorial causes. Recent insights on intramuscular hamstring coordination revealed the semitendinosus (ST) to be of crucial importance for hamstring functioning, especially during heavy eccentric hamstring loading. Scientific evidence on the consequences of ST tendon harvest for ACLR is scarce and inconsistent. This study intended to investigate the repercussions of ST harvest for ACLR on hamstring muscle function. Hypothesis: Harvest of the ST tendon for ACLR was expected to have a significant influence on hamstring muscle activation patterns during eccentric exercises, evaluated at RTP in a population of male soccer athletes. Study Design: Controlled laboratory study. Methods: A total of 30 male soccer players with a history of ACLR who were cleared for RTP and 30 healthy controls were allocated to this study during the 2018-2019 soccer season. The influence of ACLR on hamstring muscle activation patterns was assessed by comparing the change in T2 relaxation times [ΔT2 (%) = [Formula: see text]] of the hamstring muscle tissue before and after an eccentric hamstring loading task between athletes with and without a recent history of ACLR through use of muscle functional magnetic resonance imaging, induced by an eccentric hamstring loading task between scans. Results: Significantly higher exercise-related activity was observed in the biceps femoris (BF) of athletes after ACLR compared with uninjured control athletes (13.92% vs 8.48%; P = .003), whereas the ST had significantly lower activity (19.97% vs 25.32%; P = .049). Significant differences were also established in a within-group comparison of the operated versus the contralateral leg in the ACLR group (operated vs nonoperated leg: 14.54% vs 11.63% for BF [ P = .000], 17.31% vs 22.37% for ST [ P = .000], and 15.64% vs 13.54% for semimembranosus [SM] [ P = .014]). Neither the muscle activity of SM and gracilis muscles nor total posterior thigh muscle activity (sum of exercise-related ΔT2 of the BF, ST, and SM muscles) presented any differences in individuals who had undergone ACLR with an ST tendon autograft compared with healthy controls. Conclusion: These findings indicate that ACLR with a ST tendon autograft might notably influence the function of the hamstring muscles and, in particular, their hierarchic dimensions under fatiguing loading circumstances, with increases in relative BF activity contribution and decreases in relative ST activity after ACLR. This between-group difference in hamstring muscle activation pattern suggests that the BF partly compensates for deficient ST function in eccentric loading. These alterations might have implications for athletic performance and injury risk and should probably be considered in rehabilitation and hamstring injury prevention after ACLR with a ST tendon autograft.

Gender Differences in Knee Kinematics After Anterior Cruciate Ligament Injury

2013 ◽  
Author(s):  
Chelsea Marsh ◽  
Scott Tashman
Keyword(s):  
Anterior Cruciate Ligament ◽  
Muscle Activation ◽  
Cruciate Ligament ◽  
Knee Kinematics ◽  
The United States ◽  
Ligament Injury ◽  
Tibial Rotation ◽  
Leg Muscles ◽  
Muscle Activation Patterns ◽  
Anterior Cruciate

Injury to the anterior cruciate ligament (ACL) occurs 200,000 times per year in the United States. About half of these patients opt for ACL reconstruction (ACLr), while the other half choose non-surgical, conservative treatment. ACLr has been found to result in altered kinematics, namely external tibial rotation and knee adduction, during downhill running 1. ACLr also contributes to alterations in muscle activity after surgery. Leg muscles of the affected limb are weakened and contract in different muscle activation patterns when compared to healthy, uninjured patients 2.

scholarly journals Risk of Anterior Cruciate Ligament Injury in Female Soccer Athletes: A Review

2021 ◽  
Vol 2 (1) ◽  
pp. 13-21
Author(s):  
Sophia L. Mancini ◽  
Clark Dickin ◽  
Dorice A. Hankemeier ◽  
Lindsey Rolston ◽  
Henry Wang
Keyword(s):  
Anterior Cruciate Ligament ◽  
High Risk ◽  
Injury Risk ◽  
Muscle Activation ◽  
Cruciate Ligament ◽  
Relevant Literature ◽  
Acl Injury ◽  
Ligament Injury ◽  
Muscle Activation Patterns ◽  
Anterior Cruciate

Soccer is becoming an increasingly popular sport amongst women. Common movements during play, such as jumping and cutting, require rapid acceleration and deceleration of multiple lower-limb joints. The anterior cruciate ligament (ACL), which contributes to stabilization of the knee, is often injured during these events. ACL injury typically requires costly surgery, extended time away from sports, and jeopardizes long-term joint health. Due to sex-specific factors such as menstruation and anatomical disadvantages, women are more susceptible to tearing their ACL. Injury often occurs in non-contact scenarios during rapid acceleration or deceleration movements. Research has examined these movements and established several kinematic and kinetic mechanisms as well as muscle activation patterns that frequently occur at the time of injury, however results tend to vary based on population. This article summarizes recent and relevant literature of ACL injury mechanisms and highlights the lack of specific research in the high-risk female soccer athlete population. Due to inconclusive risk factors, injury prevention programs within this population have been inconsistent. ACL injury risk for female soccer athletes should be closer examined so that more specific injury risks can be established, and effective protective measures can be taken. Raised awareness of this need may capture attention in the research and medical communities and potentially stimulate the development of strategies that limit future ACL injury and thus the challenges it brings to the high-risk female soccer athlete.

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