جستجوی مقالات مرتبط با کلیدواژه « زانوی پرانتزی » در نشریات گروه « پزشکی »

The effect of knee frontal plane deviations on postural sway and kinematics ofgait in active male adolescentsKnee structural abnormalities can lead to changes human movement strategies and posture control. The aimof this study was to evaluate and compare gait and stability patterns in genuvarum, genuvalgum and healthysubject groups. In this study subjects were divided into three groups of 12 people based on Q-angle valuesand their postural sway were evaluated in three modes of perturbation and kinematics of their lowerextremity joints measured during gait. The results of this study showed a significant difference in staticbalance between genuvalgum group and the other two groups. In addition, in kinematic factors, the mostsignificant differences were observed between healthy and genuvalgum groups. According to the results ofthis study, people with genuvalgum have more stability and movement disorders than two other groups and itis necessary to pay attention to balance and movement programs in athletes with this disorder

Background and Aims Weakness in the knee muscles and other components of the knee joint can cause various complications, including the genu varum. This study aims to investigate the effects of eight weeks of running on a treadmill and on the ground on muscle activities in individuals with genu varum.Methods This is a quasi-experimental and laboratory study. Forty-five young men with genu varus were randomly divided into three groups: control, ground-based training, and treadmill training. Running exercises were performed for eight weeks in the training groups. The electrical activity of selected muscles was recorded by an electromyography system. For statistical analysis, repeated measures analysis of variance was used. The significant level was set at 0.05.Results In the treadmill training group, the electrical activity of the biceps femoris and gastrocnemius medialis muscles increased significantly after training during the heel contact phase. In the ground-based training group, the electrical activity of the biceps femoris and vastus latralis muscles significantly increased after training. In the swing phase of running, the electrical activity of the tibialis anterior, gluteus medius, and semitendinosus muscles was also significantly increased after training in the ground-based training groupConclusion It seems that running on a treadmill may have been effective in improving muscle activity and preventing the progression of the knee genu varum.

Genuvarum, genuvalgum are two common conditional disorders in the knee joint that making changes to the normal position of the lower extremity ,causes changes to the center of gravity over the reliance level and restricts control of balance and movement of the body. The purpose of this study was to The effect of a period of corrective and exercise movements on improving the deviations of the frontal plate in adolescents active with Genuvarum, Genuvalgum. Subjects of this study were divided into three groups of 12 (genuvarum, genuvalgum and healthy) by angle values ​​of Q. The exercise protocol was conducted for 8 weeks per day, including 10 minutes of warm up, 45 minutes of selected training program and 5 minutes of cool down and was added to the time and the number of repetitions during the exercise. The results of this study showed that 8 weeks of corrective and exercise exercises can significantly increase the angle of Q in the genuvarum group and reduce in the genuvalgum group. According to the results of this study, the need to pay more attention to corrective and exercise movements in athletes with this disorder is felt.

Genuvarum is a common complication among girls aged 12-16 years. This study aimed to investigate the effect of eight weeks of NASM and Theraband correction exercises on balance and kinematic variables of the knee in girls aged 16-12 years suffering pain due to genuvarum.

The research sample includes 30 of these individuals who were randomly selected and then randomly divided into three groups of 10 controls (age: 14.20 ± 1.31 years, height: 1.59 ± 0.059). M, weight: 54.80 ± 7.61, BMI: 21.26 ± 2.19 kg / m2), Theraband group (age: 14.70 ± 0.94 years, height: 1.61 ± 0.06 M, weight: 54.40 ± 4.37 kg, BMI: 21.51 ± 1.23 kg / m2) and NASM group (age: 14.71 ± 1.16 years, height: 1.66 ± 0.053 M, weight: 56.70 ± 4.47 kg, BMI: 20.52 ± 0.87 kg / m2). In this study, a balance was assessed using the Walking on the balance wood test. Also, the distance between the inner condyle of the femur and the Q angle was measured using a caliper and a goniometer, respectively. After evaluating the variables, the subjects were divided into three groups of control and training, and each training group performed the training program for 8 weeks and 3 sessions per week. The control group also performed their daily activities and physiotherapy at Arman Clinic during this period. In this study, the normality of the distributions was investigated using the Shapiro-Wilk test. To test the research hypotheses under normal conditions, ANCOVA analysis of covariance (between groups) and correlated T (within groups) were used. SPSS software version 26 was used in this study.

The results of this study showed that applying 8 weeks of NASM and Theraband training program in addition to increasing the balance was effective in improving the distance between the condylar and the Q angle (P = 0.001). In the field of comparison between the two training groups, except for the Q angle (P = 0.001), the balance variable and the distance between the condyles were not found (P ≥ 0.05).

In general, the results of the present study show the effect of both NASM and Theraband training programs on balance and improvement of knee kinematic variables; 1- The distance between the inner condyle of the femur, 2- Q angle has been effective. Based on this, it seems that the use of these two training programs in this community can lead to desirable results and shows the importance of using these exercises (especially NASM) in girls suffering genuvarum

Background & Aim:

Genu varus is one of the most common injuries of the lower limb, which affects posture control by creating internal torque on the ankle and foot joints. The complication of Genu varus is accompanied by the biomechanical change of the lower limb during walking and running. The aim of the present study was to evaluate the effect of using agility shoes on running kinetics in individuals with genu varus before and after fatigue protocol.

Methods & Methods:

This study was a case-control type. In this study, 14 individuals with genu varus and 15 healthy ones as control aged 20-30 years participate. Using the Bertec Force platform, ground reaction forces were recorded during running before and after the fatigue protocol. The normality of data distribution was confirmed using the Shapiro Wilk test. Two way analysis of variance with repeated measures was used for statistical analysis. All the analyzes were performed at a significance level of 0.05 using SPSS 25 software.

In both groups, the fxto values during the pre-test was larger than that post-test (p=0.000). Also, the fyhc values in the pretest was larger than the posttest (p=0.000). Moreover, the fypo values in the pretest were larger than the posttest (p=0.000).

In general, running kinetics were similar in individuals with genu varus compared with healthy controls before and after fatigue protocol while using agility shoes.

Genu varum is one of the most common abnormalities of the knee joint in which the inner condyles of the femur move away from each other. The aim of the present study was to compare efficiency of exercise on the treadmill and ground on the ground reaction forces during walking in people with genu varum.

The present study was a quasi-experimental and laboratory study. Forty-five boys with genu varum were selected randomly and divided into three groups of 15 in each including: exercise on the treadmill (age: 21.78±2.28 years, weight: 83.35±1.10 kg), exercise on the ground (age: 21.14±2.33 years, weight: 82.25±1.84 kg), and control group (age: 23.14±2.60 years, weight: 80.15±1.50 kg). Running exercises were performed for eight weeks in training groups with running speed of 3.2 m/s. Ground reaction forces were recorded by Bertec Corporation (Columbus, OH) with sampling frequency of 1000 Hz. Ground reaction force amplitudes and their time to peak were used for statistical analysis. For statistical analysis, SPSS V21 software and analysis of variance with repeated measures (repeated measure ANOVA) were used at a significant level of 0.05.

The results of the present study demonstrated that time to peak of the medio-lateral force at heel contact phase at exercise on the ground group was statistically different from other groups (P=0.000). Also, time to peak of the medio-latral force at heel contact phase at exercise on the treadmill group was statistically different from other groups (P =0.000). Moreover, time to peak of the vertical force at push-off phase at exercise on the treadmill group was statistically different from other groups (P =0.000).

According to the results, training on the treadmill is most effective than training on the ground on time to reach peak forces than force amplitudes. Overall, training on the treadmill have greater positive aspects than training on the ground. However, future studies are needed to establish this issue.

Background and Aims :

Considering the importance of balance and the prevalence of genu varum in soccer, this study evaluated the role of lower extremity corrective exercises on dynamic balance improvement and knee deformity in teenage football players (youth footballers). 

Methods :

This semi-experimental study was performed on 24 male soccer players aged 15-17 years with genu varum deformity (more than 5 cm knee distance), who were divided into two groups randomly. Collis for measuring the knee distances and the star balance test for dynamic balance were used in both groups. After six weeks of corrective exercise with traband (three times a week) in the training group and sport-specific activities in the control group, all measurements mentioned above were repeated in both groups. Analysis of covariance for balance and Mann-Whitney U test for knee position were used with a level of significance less than 0.05.

Results :

The results showed the significant positive effects of the exercise program on the knee position (P=0.002) and dynamic balance variables (ant: P=0.002, med: P=0.004, post: P=0.005, posterolateral: P=0.006, and other directions: P˂0.001) and balance improvement and knee distance decreasing were found in the training group.

Conclusion:

 It seems that six weeks of traband training exercises can improve dynamic balance in soccer players by reducing the knee genu varum deformity.

Genu varum is a lower limb deformity. This study was done to evaluate the effects of shoe aging on the general and directional contraction of ankle muscles during running in females with genu varum.

This case-control study was done on 30 female students (15 individuals with genu varum degree 2 and 15 healthy individuals) using new and old sneakers for 6 months in the sports biomechanics laboratory of the University of Mohaghegh Ardabili, Iran. Each subject was given a new pair of sneakers, and after the initial data collection, the subjects were asked to use them in their daily activities for at least an hour a day for 6 months. Electrical muscle activity was recorded using surface electromyography.

There was no significant difference in the general and directional contractions if ankle muscles during the running phases.

Shoe aging has no effect on ankle joint co-contractions.

genu varum is a common deformity among athletes and non-athletes’ individuals. One of the most important influencing risk factors during landing is knee flexor torque that has a huger effect on the person with varus knee. The aim of this study was to investigate the relationship of variable Rate of Loading (ROL) and knee flexion moment in individuals with varus knee for examination of ration between this biomechanical risk factor and ankle strategy.

Fourteen-man athlete with varus knee (Age: 26±3.5, Hight: 172±4.59, weight: 74. ±4.5) in single group participated in this study. Each participant done correct drop landing for three-time under force plate and motion capture recording. variability outcome calculations were performed using MATLAB b2016R software.

The results of the of Pearson correlation coefficient indicated that the variable ROL has a positive significant relationship with the variable of Maximum flexor torque of the knee (P≤0.05). Accordingly, alongside of ROL reduction based on special ankle strategy during landing knee flexion moment had been reduced.

The results of this study showed that the ROL controlling strategy in the ankle can affect the flexor torque of the knee and reduction the effect of this biomechanical risk factor.

Knee genu varum is one of the lower limb abnormalities associated with biomechanical changes in lower limbs. The present study aims to compare the effects of shoe lifespan on ground reaction force (GRF) components in women with knee genu varum and healthy peers during running.

The is randomized clinical trial. Participants were 15 female college students with knee genu varum and 15 healthy peers. A new pair of sport shoes was given to each participant during to wear them for six months. Then, they were asked to run at a preferred speed in three trials with the new shoes (pre-test phase) and three trials with the used shoes (post-test phase) in a path where a force plate was installed. Statistical analysis was conducted by using repeated measures ANOVA. All analyses were done in SPSS v. 23 software. The significance level was set at 0.05.

 The results indicated the significant main (group) effect of shoes on peak anterior-posterior GRF during heel contact and on the anterior-posterior impulse (P<0.018, d>0.8). The values of these variables in the genu varum group were significantly higher than in the healthy group. Moreover, findings showed the significant main effects of shoes on the time to reach the peak GRF during heel strike and on the loading rate (P< 0.02, d > 0.9). The time to reach the peak GRF during heel strike with the used shoes was shorter than with the new shoes (P= 0.015, d=0.9), while the vertical loading rate during running with the worn shoes was greater than with the new shoes (P=0.019, d=0.9).

 Running with shoes having a lifespan >6 months is a risk factor for women with knee genu varum.

Since changes in body alignment cause an impairment of motor skills, the purpose of this study was to investigate the effect of genu varum on the kinetics of running in anticipated and unanticipated conditions.30 elite male soccer players (two groups of genu varum and normal) were recruited in this semi-experimental study. The data of ground reaction force was collected by two force plates during running.The results showed that vertical ground reaction force and loading rate were significantly greater in genu varum group compared with normal group in both anticipated and unanticipated conditions (p≤0.05). Also, time to peak of vertical ground reaction force in unanticipated condition was longer than anticipated condition (p≤0.05). There was no significant different between groups and conditions in anterior-posterior and medial-lateral GRF, time to peak of anterior-posterior GRF, vertical and propulsive impulse and contact time (p>0.05).According to the results, it seems that kinetics of running of soccer players can be affected by genu varum and anticipation.

Genu varus is one of the most common lower extremity complications that affect the performance of people during daily activities and exercise. The aim of this study was to investigate the effect of using knee braces on the ground reaction forces in people with genu varus during walking.

The present study was a clinical trial. Thirty male students with genu varus (20-30 years old) were randomly divided into control and intervention groups. The intervention group used knee braces for 8 weeks during their daily activities. The control group did not receive any intervention. Ground reaction force data were recorded by a force plate system during walking.

After 8 weeks, the peak of ground reaction force in the lateral direction during the post-test increased significantly compared to the pre-test (P=0.003). Also, after 8 weeks, the peak of the ground reaction force in the anterior direction during the post-test was significantly increased compared to the pretest (P=0.015).

In general, braces increased the lateral peak values of the ground reaction force, which can lead to increased foot pronation and thus increase the likelihood of long-term injury.

Genu varus is a deformity in frontal plane that in weight bearing position whiles the medial malleolus’s touch each other, the medial knee epicondyles far from each other. Genu varus is very prevalent in soccer players. This study was done to evaluate the effect of using knee brace and lateral wedge on muscular activity amplitude in male soccer players with genu varus during running.

This quasi-experimental study was done on 15 right-footed male soccer players with genu varus and 15 healthy soccer players. A wireless electromyography system with eight pairs of bipolar Ag/AgCl surface electrodes (20 mm center-to-center distance; input impedance of 100 MΩ; and common-mode rejection ratio of >110 dB) was used to record the activity of the tibialis anterior, gastrocnemius medialis, biceps femoris, semitendinosus, vastus lateralis, vastus medialis, and rectus femoris, and gluteus medius muscles of the right leg. Electromyography data were recorded by sampling rate of 1000 Hz in selected muscles during running at five conditions including: control, 10 degrees lateral wedge, 15 degrees lateral wedge, simultaneous using 30 degrees brace and 10 degrees lateral wedge, and simultaneous using 30 degree brace and 15 degrees lateral wedge.

Treatment intervention had reduction effect on muscular amplitude of biceps femoris and vastus lateralis during push-off phase (P<0.05). Muscular amplitude of biceps femoris and vastus lateralis during loading phase was reduced due to Treatment intervention (P<0.05).

Simultaneous using of lateral wedge and knee brace reduce the electromyography activity of vastus lateralis and biceps femoris muscles. This reduction may be associated with passive support of knee brace that in result could decrease the external knee adductor mowment.

Genu varus deformity is associated with changes of lower limb muscle co-contraction and running economy. This study was done to evaluate the effect of using of brace in three different knee flexion angles on running economy and lower limb muscular co-contraction in individuals with genu varus.

This quasi-experimental study was done on active soccer male students including 15 healthy subjects (average age of 22.86±1.55 years) and 15 subjects with genu varus (average age of 22.13±1.80 years). The amount of electrical activity of the muscles (tibialis anterior, medial gastrocnemius, vastus medialis, vastus lateralis, rectus femoris, biceps femoris, semi-tendinosus) were recorded by electromyography system during four conditions of with and without using knee brace. After that, directed and general co-contraction was computed during running. The angles of brace were 15, 30, and 60 degrees. The values of VO2 max were recorded using of gas analyzer system to compute running economy.

The ratio of respiratory exchange was significantly more in the genu varus group than healthy group (P<0.05). However, the acute effect of brace was not significant on running economy and ratio of respiratory exchange. The main effect of brace was significant for general co-contraction of knee joint during the loading phase (P<0.05). Paired wise comparison revealed significant greater general knee co-contraction during brace conditions (P<0.05). However, the general knee co-contraction during loading phase reduced while using brace 15 degree. The main effect of “brace” for ankle joint general co-contraction during the push-off phase was significant (P<0.05). Paired wise comparison revealed significant greater general ankle co-contraction during brace conditions at push-off phase (P<0.05).

Knee brace did not change running economy. However, the using of brace 15 degree improved general knee joint co-contraction during loading phase.

 The purpose of this research was to compare the coordination variability of lower extremity segments in men with genu varum and healthy men during treadmill running at different speeds.

 Among sports and physical education students, 15 healthy men and 15 men with genu varum voluntarily participated in this research. Each participant ran on treadmill for 60 seconds at preferred speed and 25% faster and 25% slower than preferred speed. The kinematics data of lower extremities were collected by MyoMotion motion analysis system at 200 Hz sampling frequency. Coordination calculations were done by continuous relative phase (CRP) method for three segments coupling and compared between two groups.

 The results of repeated measures analysis of variance (ANOVA) between groups showed that coordination patterns of segments did not differ significantly between the groups during running at different speeds (P ˃ 0.05). However, the change in running speed caused significant differences in coordination and coordination variability of segments in some phases of running in two groups (P ≤ 0.05).

 Coordination pattern of segments during running seems the same between genu varum and healthy groups; however, significant differences in these patterns and different running speeds were evident in both groups. On the other hand, coordination variability of segments was not different between groups, but the increase in running speed reduced the coordination variability during early and late swing and mid-stance phase of running in both groups. This finding may imply higher risk of overuse injuries at these phases.

Running poses an essential role in maintaining cardiovascular health. However, it has been demonstrated that 2.5 to 38 injuries per 1,000 hours of running can occur. The purpose of this study was to investigate ground reaction forces components during running with running shoes compared to control shoes in individuals with genu varum.

This study was laboratory and semi-experimental. The statistical society includes all male students at the University of Mohaghegh Ardabili. The subjects of the study consist of 15 healthy males and 14 males with genu varum. Ground reaction force components were recorded using Bertec force plate during running in four conditions: barefoot, running shoes (Alborz shoes and agility shoes), and control shoes. Two ways ANOVA with repeated measure was used for statistical analyses.

Peak lateral ground reaction force at heel contact with Alborz shoes were higher than that of control shoes (P = 0.001). Peak anterior ground reaction force component at the push-off phase with agility shoes were lower than those in control shoes (P < 0.003) and barefoot (P < 0.019) condition.

Since Alborz shoes were able to reduce the peak lateral ground reaction force, using these shoes was recommended to reduce injuries. However, further study in this field is warranted.

Genu varum is one of the most common mal-alignments of lower limb associated with dysfunction. However, little attention has paid to limb alignment and muscle activities while performing sport-specific tasks in persons with genu varum. The aim of this study is to compare the Effect of Genu Varum on the Pre-activation، Muscle Activation Pattern and Time to Stabilization During the Single Leg Jump-Landing

In thiscross-sectional study, 30 athletes (15 with and 15 without genu verum) participated. Genu varum was assessed with caliper with the accuracy of 0.01 mm. The time to stabilization was measured using force plate in the jump-landing motion. The data obtained from electromyography that synchronized with the force plate and the onset of muscle activity were calculated and analyzed in MATLAB. For the statistical analysis, independent samples t-test with the significance level of p≤0.05 was used.

The results showed that the activity of the gluteus medius muscle (p=0.003) in genu varum knee is less than normal, and this difference was statistically significant. There were no significant differences in the activity of gluteus maximus, biceps femoris and semitendinosus between the two groups. In addition,no significance difference was observed in the onset of muscle activity between groups (p>0.05). Moreover،the comparison of time to stabilization in the medial- latera (p=0.003) and overall (p=0.01) in participants with genu varum knee is higher than normal participants, and this difference was significant. Yet, in the anterior-posterior direction, there was no significant difference between the two groups (p>0.05).

It seems that genu varum is influential on the biomechanics of jump-landing and it is associated with reduced activity in the gluteus medius muscles. These changes may be associated with reducing lateral stability and increased risk of injuries in the athletes.

Genu Varum is one of the most common malalignments of lower limb but not a lot of attention have been paid to the biomechanics of lower extremities and the muscle activities while performing the sport specific tasks in the persons. The aim of the present study was to compare the Electromyographic activity of trunk and hip muscles during the single leg jump-landing in men with and without Genu Varum.

A total of 30 athletes (15 with genu Verum and 15 without this malalignment) participated in the current cross-sectional study. Genu Varum was assessed using Bone Caliper with the accuracy of 0.01 mm. Participants performed the jump-landing on a forces Plate (Model ver 3.0.2, Danesh Salar Iranian Co.). The electromyography activities of muscles were recorded using the EMG and 100 milliseconds before and after the initial contact. MATLAB software was used for data analysis. For the statistical analysis, the independent t-test with the significance level of o≤0.05 was used.

There were no significant differences in the activity of biceps femoris and semitendinosus muscles between the two groups, but there were significant differences in the mean values of gluteus Medius (P=0.001) and quadratus lumborum (P=0.002) activity between the groups (P<0.05).

According to the results, it seems that the Genu Varum is effective on the biomechanics of jump-landing and it is associated with reduced activity in the gluteus Medius and quadratus lumborum muscles. These changes may be associated with reduced lateral stability and increased risk of injuries in the athletes.

Genu varum is one of the most common knee deformities, which can cause changes in the forces of the body and the way the muscles of the lower limbs function due to changes in the mechanical axis of lower limb. The aim of this study was to investigate ground reaction forces and electromyography muscle activity of lower extremity during the stance phase of walking in subjects with and without genu varum deformity.

In this descriptive study conducted in Kharazmi University in 2017, 30 active men were categorized into two groups of genu varum (n=15) and normal (n=15) based on their knee posture. The participants’ age ranged from 20 to 25 years. Using force plate and electromyography, respectively, ground reaction force and muscle activity were calculated. The data were analyzed utilizing independent samples t-test for between-group differences.

The findings indicated that the depth force of vertical ground reaction force in the normal group had significantly higher value compared to the genu varum group (p=0.018). Also, gluteus medius muscle during the loading response phase of walking in the active male with genu varum had significantly higher levels of activity than the control group (p=0.031).

According to the findings of this research, it seems that mechanical deviation due to the deformity of the genu varum causes some changes in the ground reaction forces and the performance of the lower limb muscles during walking. The findings point to the need to pay attention to these factors in people with genu varum.