knee flexion range of motion
Normal Motion. Range of motion is typically measured using a tool called a goniometer. Normal ROM at the knee is considered to be 0 degrees of extension (completely straight knee joint) to 135 degrees of flexion (fully bent knee joint).ost functional activities require 0 to 117 degrees of motion at the knee. Walking requires complete knee extension at heel strike and up to 60 degrees of flexion at the initiation of swing phase.