Mainly the position of the waist (44.44%) and the 0 20 40 60 80 Total Ankles / feets Knees Hips / thighs lower back Upper back Wrists / hands Elbows Shoulder Neck Percentage A n at o m ic al s it es During the last 12 months During the last 7 days Obstructing work 11 neck (44.11%).