In this arm, the subjects will receive the intervention of FSN on Day1, Day2 and Day4, in total 3 treatments. The subjects will receive assessments before and after each interventions. After total treatments finished, the subjects will receive assessments on Day8 and Day15, separately.

In this arm, the subjects will receive the intervention of Transcutaneous Electric Nerve Stimulation on Day1, Day2 and Day4, in the total 3 treatments. The subjects will receive assessments before and after each interventions. After total treatments finished, the subjects will receive assessments on Day8 and Day15, separately.

In this study, physician will use a disposable Fu's subcutaneous needling(FSN) to penetrate the subject's skin from anterior superior iliac spine(ASIS) to 1/3 superior border of patella. Then the physician will push forward the needle parallel to the skin surface. The physician will sway the needle 45 times in 30 seconds. After swaying the needle, the physician will instruct the subject to do sole dorsiflexion for 10 seconds resisting the physician's opposite force, then the subject take a rest for 10 seconds. The above actions are 3 repetitions. Then the subject do knee flexion and extension for 10 seconds, and take a rest for 10 seconds. These actions are also 3 repetitions. After the above reperfusion approach of muscles, the physician will take out the needle to finish the treatment.

The visual analogue scale or visual analog scale (VAS) is a psychometric response scale which can be used in questionnaires. This tool used to help a person rate the intensity of certain sensations and feelings, such as pain. A straight line of 100mm is actually marked with 0 mm on the far left and 100mm on the far right. Two faces are drawn on both ends. Explain to the patient that 0 mm means no pain and 100 mm means very painful. From the left end The right shift indicates more and more pain. Take a pen and let the patient draw a short line vertically on the line, representing his painful position, and record the measured cm value. In this test, if the score of the subject decreases, it can represent the treatment is helpful for the improvement of the patient's pain.

Pressure pain threshold (PPT) is defined as the minimum force applied which induces pain. This measure has proven to be commonly useful in evaluating tenderness symptom

Muscle tension is the muscle's resistance to passive stretch during resting state. The measuring tool called Myotone will calculate three parameters such as tone, elasticity and stiffness automatically and get a value to represent the muscle tension. If the value decrease, it can represent the treatment is helpful for the subjective muscle relax.

GyKo is an inertial measurement tool for the analysis of the movement of any body segment

The WOMAC measures five items for pain (score range 0-20), two for stiffness (score range 0-8), and 17 for functional limitation (score range 0-68).