Abstract
Robot-assisted reduction of pelvic fracture, the bone traction needles need to be inserted into the iliac bone of the affected pelvis, and the clamping instrument of the robot is connected to the bone traction needle. The biomechanical characteristics of the pelvic musculoskeletal tissues are different with the different spatial position and orientation of the bone traction needle. In this paper, a new PA-MTM model considering the pinnate angle of skeletal muscle is proposed to analyze the muscle force of skeletal muscle. According to the planned reduction path, reduction force during the reduction process is calculated. Based on the pelvic CT scan data and the muscle distribution of the pelvis, the musculoskeletal model of the fractured pelvis is reconstructed. Then, the finite element model of the pelvic musculoskeletal tissue with bone traction needle is established. The maximum reduction force is applied on the bone traction needles, and the stress distribution of the pelvic musculoskeletal tissue with the needles in different spatial position and orientation is comparatively studied. The results show that the suitable force point on bone traction needle is S1 point. When the bone traction needle is inserted into the iliac crest and the anterior inferior iliac spine, the pelvis is in a good stress state.
Highlights
The pelvis which is a pelvis skeleton connecting the spine and lower limbs is formed by the posterior sacrum, coccyx and left and right hip bones
Based on the theoretical analysis of the muscle force according to the PA-MTM skeletal muscle model, it can be known that the muscle force is related to the length of the muscle, the speed of muscle contraction, the degree of activation and other parameters
The finite element method is used to compare the effects of different application points and different position and orientation of bone traction needles on the reduction stability, and to determine the application points and position and orientation of bone traction needles inserting into the pelvis, which provides a reference for selecting the suitable application points and insertion positions of pelvic fracture reduction robots
Summary
The pelvis which is a pelvis skeleton connecting the spine and lower limbs is formed by the posterior sacrum, coccyx and left and right hip bones. In 2007, Phillips et al. ANALYSIS ON CIRCUMPELVIC MUSCLE FORCE AND SPATIAL POSITION AND ORIENTATION OF BONE TRACTION NEEDLE FOR PELVIC FRACTURE REDUCTION. Based on the 3D reconstruction results of the hip tissue, the biomechanical model of the skeletal, muscle-tendon system of the human hip was established by finite element method. Many scholars have studied the influence of fixing screws after reduction on the stability of pelvic reduction and the biomechanics of musculoskeletal tissue. The influence of different spatial position and orientation of two bone traction needles on the biomechanics of musculoskeletal tissue during the pelvic fractures reduction, has not been studied. The reduction force is applied on the bone traction needles, and the finite element analysis of the pelvic musculoskeletal tissue with bone traction needles is performed. Reasonable force point and position and orientation of the bone traction needle can be obtained
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