Estimation for Rotated Center of Shoulder in Human Upper Limb Dynamic Motion Measurement
Zhenyu Liu · Journal of Tianjin University of Science and Technology · 2007
In the measurement of human upper limb,the position for the center of shoulder joint can be supposed by comparative position to acromion.The way how to ensure the comparative position had been researched.Based on the upper limb being supposed as a rigid body and the joints being simplified,the relationship between the acromion and the center of the shoulder was measured by the positions of markers which was gotten by electromagnetic tracking system or three-dimensional measurement system based on general cameras.Distance between the acromion and the center of the shoulder was calculated by the data of this experimentation.The absolute value of error was smaller than 2.7 cm.For affecting by some errors,such as the error of placement of sensors,the error of relative slip between skin and bones,the results are acceptable.The results also show that the acromion can be used to take place the center of the shoulder joint when the system of the shoulder joint is constructed.