Due to the complex structure of the knee, pain can present in many different areas. Severe knee pain when running, walking, going up and down stairs, and even knee pain while sitting are all frequent complaints.
In addition to knee pain symptoms, weakness, stiffness instability, and decreased range of motion are very common. Stiffness in the knee or a locking sensation may prevent you from fully extending or bending the knee. Popping, clicking, or grinding sounds when kneeling or squatting may indicate knee damage if accompanied by knee pain. Physical injuries to the knee can result in contusions, edema, decreased range of motion, decreased strength, gait disturbances and functional/ athletic limitations.