MEASURING SYSTEM AND MEASURING METHOD FOR ANALYZING KNEE JOINT MOTION TRAJECTORY DURING CYCLING

摘要

A measuring system for analyzing a knee joint motion trajectory when a rider is riding a bike (cycling) and a measuring method thereof are disclosed. The measuring system includes a pedal-able device, a light emitting component fixed at a tibial plateau of the rider, an image capturing device, and a knee joint motion trajectory analysis device. When the rider continuously pedals the pedal-able device, the image capturing device captures an image of a central position of the rider's lower limb and a light spot trajectory image of the light emitting component. The motion trajectory analysis device generates an ellipse motion trajectory diagram. After comparing and analyzing a body central line with a trajectory long axis line, a foot force distribution and a shifting data of the knee joint motion trajectory is acquired, and a proper insole is determined.

主权项

1. A measuring system for analyzing a knee joint motion trajectory for measuring and analyzing the knee joint motion trajectory when a rider is riding a bike, comprising:
a pedal-able device which is a frame including a frame stem and a pair of pedals, for allowing the rider to place his/her feet on the pedals; a light emitting component fixed at a tibial plateau of a lower limb of the rider, for emitting lights when the rider continuously pedals the pedal-able device; an image capturing device disposed at the front of the pedal-able device, wherein when the rider continuously pedals the pedal-able device, the image capturing device captures an image including the central position of the lower limb of the rider and a light spot trajectory image of the light emitting component; a knee joint motion trajectory analysis device, connected with the image capturing device, wherein the image capturing device inputs the image of the central position of the lower limb of the rider and the light spot trajectory image of the light emitting component to the knee joint motion trajectory analysis device, and the knee joint motion trajectory analysis device includes:
a trajectory long axis analysis module which captures two points from the upper side and the lower side of the light spot trajectory image as a longest line, wherein the two points are respectively an upper limiting point and a lower limiting point, and by measuring the longest line virtually linked between the two points captured from the upper side and the lower side of the light spot trajectory image, a length of a trajectory long axis line is acquired;a trajectory transverse line analysis module which captures two points from the left side and the right side of the light spot trajectory image as another longest line, wherein by measuring the longest line between the two points captured from the right side and the left side of the light spot trajectory image, a length of a maximum transverse line is acquired;a trajectory tilting angle analysis module, connected with the trajectory long axis analysis module, wherein the trajectory tilting angle analysis module defines a reference line which is absolutely vertical to the ground, and analyzes an angle between the reference line and the trajectory long axis line for acquiring a trajectory tilting angle value;a body central line definition module defining a body central line of the rider according to the image of the central position of the lower limb of the rider;a motion trajectory analysis module, connected with the trajectory long axis analysis module, the trajectory transverse line analysis module, the trajectory tilting angle analysis module, and the body central line definition module, wherein the motion trajectory analysis module acquires an ellipse motion trajectory diagram according to the trajectory long axis line, the maximum transverse line, and the trajectory tilting angle value, and after comparing and analyzing the trajectory long axis line of the ellipse motion trajectory diagram on the basis of the body central line of the rider, the motion trajectory analysis module also acquires a foot force distribution and a shifting data of the knee joint motion trajectory when the rider is riding the bike; andan insole selection determining module, connected with the motion trajectory analysis module, for determining a foot arch support insole which is suitable to the rider according to the foot force distribution and the shifting data of the knee joint motion trajectory analyzed by the motion trajectory analysis module.