پریا جمشیدیان

ACL injury is one of the most common sport injuries which undergo reconstructive surgery. Electromyography or recording of muscles’ electrical activity is a suitable means to assess changes in motor control system output. The goal of this study is to compare the lower limb muscles EMG activity during drop landing in individuals after ACL reconstruction and healthy subjects.
Eleven men who had undergone ACL reconstruction 6 to 24 months ago (Age 29±6 years old) and 11 healthy men (Age 28±2 years old) participated in the study. Amount of electrical activity for tibialis anterior, vastus medialis, vastus lateralis, semitendinosus and biceps femoris muscles was recorded using surface electrodes during drop landing and calculated for two time intervals. The amount of activity was measured in -150 to and to intervals in relation to the landing moment. Subjective IKDC questionnaire and cross-over hop functional test were used to determine the subjective and objective functional level. Independent t test was used to determine between-group statistical differences.
Feed forward activity of semitendinosus (P=.041) and biceps femoris (P=.008) muscles were significantly higher in ACLR group and feedback activity of vastus medialis (P=.03) muscles was significantly lower in ACLR group. Healthy individuals showed higher score on both the functional test and IKDC questionnaire. (P Individuals who had undergone reconstructive surgery of ACL showed different muscular activity compared to healthy subjects and closer to ACL deficient individuals 6 months after surgery and routine rehabilitation.

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.