An Activity Analysis of Feeding my Cat

 I feed my cat every day multiple times a day. My knees start in an extended position and end in a flexed position when I bend down to reach his bowl. The motion of extension and flexion at the knee occur in the sagittal plane about the frontal axis. The osteokinematics of the knee for this action are flexion and extension in a closed kinematic chain. Regarding arthrokinematics, the moving femurs are the convex segments which roll posteriorly and glide anteriorly on the stable concave tibial plateaus as my knees flex. The prime movers for knee flexion are the hamstrings which include the semitendinosis, semimembranosus, and biceps femoris muscles. They perform in an eccentric contraction for this movement.