Gait Analysis
Maryam Hajizadeh; Alireza Hashemi Oskouei; Farzan Ghalichi
Volume 11, Issue 3 , September 2017, , Pages 201-210
Abstract
Anterior cruciate ligament (ACL) rupture is one of the most costly knee injuries, usually occurring to young athletes, often leading to functional instability, inability to return to previous levels of physical activity, and premature osteoarthritis (OA). The main function of ACL is controlling anterior ...
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Anterior cruciate ligament (ACL) rupture is one of the most costly knee injuries, usually occurring to young athletes, often leading to functional instability, inability to return to previous levels of physical activity, and premature osteoarthritis (OA). The main function of ACL is controlling anterior tibia translation as well as axial tibia rotation. Therefore, patients with ACL deficiency (ACLD) have to use different compensatory mechanisms and kinematic changes to maintain their stability during different activities. The study aims to measure the reliability of knee kinematics and ground reaction force during stair negotiation. Fifteen participants with unilateral ACLD ascended 4-step staircase, where 8-10 reflective markers was inserted on each segment of lower extremity. Five-camera VICON system and 10-camera VICON system were used in the first and second phase of study, respectively. Intra-class correlation coefficient (ICC) and standard error of measurement (SEM) was calculated for each parameter in the knee events during stair climbing. The results showed high consistency of kinematic parameters and GRF components was handled through reliability and repeatability calculations. ICC (2,5) showed similar values in injured and healthy contralateral leg with the range of (0.59-0.98) for all knee joint rotation and GRF components.
Gait Analysis
Maryam Hajizade; Alireza Hashemi Oskouei; Farzan Ghalichi; Farhad Tabatabai Ghomshe; Mohammad Razi; Gisela Solo
Volume 9, Issue 1 , April 2015, , Pages 17-31
Abstract
Patients with ACL deficiency (ACLD) have to use different compensatory mechanisms to maintain their stability during daily activities. The aim of this study is to determine the differences in 3D kinematics and peak ground reaction forces (GRF) between ACL deficient legs and healthy contralateral legs ...
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Patients with ACL deficiency (ACLD) have to use different compensatory mechanisms to maintain their stability during daily activities. The aim of this study is to determine the differences in 3D kinematics and peak ground reaction forces (GRF) between ACL deficient legs and healthy contralateral legs during stair ascent. Eight subjects with unilateral ACL deficiency participated in this study. Healthy contralateral legs were considered as control group for further comparisons to ACL deficient legs. A six camera VICON motion analysis system and 2 portable force plates were used to record the locomotion while walking up custom-made stairs with two different step heights. Advanced OSSCA technique was used to assess tibiofemoral knee kinematics, a combination of symmetrical axis of rotation (SARA), symmetrical center of rotation estimation (SCoRE) and optimal common shape technique (OCST). The results of this study show that participants with ACLD experienced different kinematics and peak GRFs in different step heights (p<0.05). During ascending stairs with 17cm height, legs with ACLD exhibited less varus, more external rotation and less impact peak in pre-swing stance and early swing phase compared to contralateral healthy leg (p<0.05). The other stair height, 20 cm, resulted in more extension, more valgus and more external tibia rotation in injured leg compared to contralateral leg during terminal extension of stance phase (p<0.05). In both step heights, injured leg reached it maximum extension peak at an earlier time. The results of this study imply that participants with ACLD make use of different 3D rotational tiobiofemoral kinematics and different GRF compared to healthy contralateral leg. These compensatory mechanisms would finally bring about different knee joint loading, which provides the potential of cartilage degeneration and early osteoarthritis.
