1, determine the position of the patella 2, patella upper edge 10cm, 15cm 3, circumference measurement Determine the measurement starting point and then objectively measure the circumference length of the limb 4, record the circumference of both lower limbs a affected limb circumference b healthy limb circumference c bilateral comparison 5, calf circumference Requirements: symmetrical measurement of the thickest part of the muscle belly of both calves, objective comparison. 6.Cautions: 1) fully expose the measurement site; 2) the measurement site and the placement of the body position to be consistent, the tape measure should be consistent; 3) the measurement should be objective, do not have subjective personal factors.