Effect of Hemipelvectomy Amputation on Kinematics and Muscle Force Generation of Lower Limb While Walking

Objective Hemipelvectomy amputation is a surgical procedure in which the lower limb and a portion of pelvic are removed. There are a few studies on the performance of this group of patients while walking. The aim of this paper was to evaluate the effect of hemipelvectomy amputation on kinematics and muscle force generation of the lower limb while walking with Canadian prosthesis.
Materials & Methods A subject who underwent hemipelvectomy amputation on his left side and whose mass, height, and age were 75 kg, 1.75 m, and 39 years, respectively, was involved in this study. Qualisys motion analysis system with seven cameras and force-plate system were used to record marker tracking and ground reaction forces. Twenty reflective markers were attached to the subject’s body. As the subject walked , the data was recorded. The mean of five trials was used for statistical computing. The data was collected with the frequency of 120 Hz and filtered with 10 Hz low-pass filter. Muscloskeletal modeling was conducted by Visual 3D and OpenSim software. All data were analyzed using the SPSS 19 software at α=0.05.
Results There were significant differences between knee and ankle joint kinematic pattern at Loading, Mid-stance, Terminal stance, and Pre-swing phases of gait (P0.05). Force generation of the hip abductor, hip extensor, and knee extensor along with tibialis anterior and posterior of the patients in the sound leg were significantly more than that of the normal subject (PConclusion The kinematics pattern of the patient’s lower limb during gait is different. Kinematic changes are associated with a significant increase in lower limb muscle generation that can have a degenerative effect on the knee joint. So the importance of this subject should be considered by rehabilitation experts.