جستجوی مقالات مرتبط با کلیدواژه "لیگامنت صلیبی قدامی" در نشریات گروه "پزشکی"

Fatigue can lead to harmful changes in landing kinematics and put the knee joint in a position that increases chances of injury to the anterior cruciate ligament. The purpose of the present study was to investigate the effect of eight weeks of jump training on selected kinematic factors conditions in Men's Handball Player Premier League who are at the Risk ofAnterior Cruciate Ligament Injury.

In the current study, 30 handball players in the Iranian Premier League were selected purposefully and randomly divided into two control and experimental groups. Prior to and eight weeks after the exercises (3 sessions per week) at the same time and place, after determining the participants' dominant leg and applying the fatigue protocol, they performed a single-leg landing jump. Kinematic factors of the lower limb and trunk were recorded during the single-leg landing using Motion Analysis device to investigate movements in the sagittal and frontal motion plate. During the research period, the control group did not perform any intervention training program. ANCOVA was run to analyze the study hypotheses in SPSS, version 20.

The results showed that after eight weeks of training in fatigue conditions, knee, hip, and trunk flexions increased in the exercise group (respectively p=0.001, p=0.002, p=0.001,) while no significant decrease was observed in lateral trunk tilt, knee valgus, and tibial torsion.

According to the results, plyometric exercises may be effective in preventing anterior cruciate ligament injury. These exercises prevent mechanisms that cause damage to the anterior cruciate ligament by affecting the kinematic angles of the joints and by increasing the muscular feedforward activity and the development of the entire musculoskeletal system.

Single-leg landing is a common movement in many sports and is known to be an important cause of non-contact anterior cruciate ligament injury, since some well-known exercises have a beneficial effect on the non-contact injuries. The purpose of the current study was to compare male individuals' selected knee kinematic factors during single leg landing after six weeks of multi-angled isometric exercises on knee joint flexor and extensor muscle groups.
In the present study, 30 males (mean age: 24.82 ± 1.88 y, weight: 78.8 ± 1.08 kg, height: 1.87 ± 0.05 m) were objectively selected. Participants were randomly divided into two groups of isometrics (n=15) and controls (n=15). Prior to and six weeks after the exercises (3 sessions per week), at the same time and place, the single-leg landing motion was recorded by the motion analysis system, and using MATLAB software the values ​​of knee valgus, knee flexion, and tibia rotation were evaluated. During the research period, the control group did not have any therapeutic intervention program. The results of the study were analyzed using covariance analysis.
The results showed that there was a significant decrease in the valgus angle after training (P=0.029), a significant increase in knee flexion angles (P=0.001), and a significant decrease in the angle of tibia rotation (P =0.000)
According to the results, multi-angular isometric exercises have a positive effect on the selected kinematic factors studied in the present study. These factors are important factors in the anterior cruciate ligament injury; therefore, it seems that such exercises can be carried out without the need for certain specialties. These exercises are suggested to prevent anterior cruciate ligament injury.

Most knee anterior cruciate ligament injuries happen during challenging activities like drop landing. Core muscles feedforward activity can control challenging activity and prevent injury. The aim of this study was to investigate core muscles feedforward activity in patients after ACLR and healthy group. Eleven males with ACLR, aged 18-40 years old, with at least 6-24 months after reconstruction surgery and eleven mathed males as a control group were enrolled in this study. Muscle activity of Geluteus medius, Abdominis external oblique, Quadratus lumborum and erector spine in landing was recorded in both groups. Cross hop functional test and IKDC questionnaire were completed and compared in both groups. Significance level was considered less than 0.05 for all analysis. score of IKDC subjective questionnaire and cross hop functional test in control group were significantly more than the score of patients (p≤0.000 questionnaire, p=0.039 functional test). Feedforward response time for Gluteus medius (p=0.028), Abdominis external oblique (p=0.03) and erector spine (p=0.028) in control group was significantly sooner than patients with ACLR. Quadratus lumborum was not significantly different in these two groups (p=0.191). muscles activity and their patterns in these groups observed different. Patient group did not have appropriate feedforward activity; they also demonstrated a decrease in functional test and IKDC questionnaire. These results necessitate a appropriate rehabilitation program.

Identifying factors which cause the high incidence of ACL is of great importance. The anterior shear forces are the primary mechanism of load sustained on the ACL. During exercise، the activity of muscles and position of lower limbs may increase or decrease the anterior shear force. The purpose of this study is to investigate the relationship between the activity level of some lower extremity muscles and anterior shear force during single-leg jump landing. Twenty male-students of physical education participated in this study. EMG activity of the muscles of the gluteus medius، tibialis anterior and hamstring were evaluated via Electromyography system and ground reaction force was evaluated via force plate system in jump-landing task. There was used Pearson correlation test. The results indicated no significant correlation between tibialis anterior and gluteus medius muscles activity with shear force، while there was found correlation between lateral hamstring muscle activity and anterior shear force (P< 0. 05). The findings of this study showed that hamstring muscle activity during single-leg jump landing acts as a supporting muscle of ACL. This increased muscle activity leads to the reduction of the load on the ACL.

Anterior cruciate ligament (ACL) damage is the most common injury of knee. It can change gait kinematics. Neuromuscular training and perturbation treatment programs are supposed to be effective in modifying gait kinematics of patients with ACL damage. The purpose of this study was to determine the effect of modified perturbation training protocol on gait kinematics in ACL deficient patients. Ten professional male athletes, between 18 and 45 years, with at least 6 and at most 24 months history of unilateral ACL rupture were enrolled in the study. Kinematics data of hip, knee and ankle joints were recorded using electrogoniameter device during walking before and after ten sessions of perturbation training. IKDC Subjective and Lysholm questionnaires scores were analyzed before and after training. IKDC Subjective and Lysholm questionnaires scores significantly improved after treatment (P=0.005). Hip range of motion (P=0.02), peak flexion of hip (P=0.02), hip angle at stance phase (P=0.02) and peak dorsiflexion of ankle (P=0.03) were significantly increased after training. Perturbation training probably affects neuromuscular control and modifies feed-forward control, thus it can improve compensatory patterns of ACL deficient patients during gait. ACL deficient patients may adapt their problem with further use of hip joint and increasing hip flexion.