Generally, the following steps can be used to determine whether there is a strain on the tendons of the lower extremities: 1, to confirm whether there is a history of lower extremity strain, such as whether the patient has a sprain of the joint, or whether there is a passive stretching action of the tendons. For example, if the patient over-extends the lower extremity when falling to the ground, which leads to excessive abduction of the hip joint, thus causing strain of the muscles around the hip joint. 2, to observe whether there are necessary symptoms of tendon strain, such as whether there is obvious pressure pain in the area of tendon expansion and whether there is obvious weakness or pain aggravation when moving. 3, if there are two conditions mentioned above, it is highly suggestive of possible tendon strain. However, to further confirm the diagnosis, corresponding auxiliary examinations are needed, such as MRI of the lower limbs, to clarify whether there is any injury around the tendon. In general, the above three steps can basically determine whether there is a tendon strain in the lower extremity.