Patients who have undergone knee surgery, especially knee replacement surgery and ligament reconstruction surgery, are instructed by their doctors to perform functional exercises with knee flexion after surgery. During the exercises the patient is often in more pain and the pain is more intense, so why must the doctor advise the patient to flex the knee and reach a certain angle? The reason is that we need to flex the knee at a certain angle in order to return to a healthy life and perform most of the functions of daily living. Generally speaking, the human body needs knee flexion mobility of 67° to walk normally, 83° to complete stair climbing, 90° to walk down stairs, 105° to stand from a seat, and 115° to rise from a couch. Therefore, a minimum of 110 degrees of knee flexion is required to pass the majority of daily life after knee surgery.
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