If you can’t bend your leg after short-term ligament rupture surgery, it may be a reaction to anesthesia and no treatment is needed. If it is a postoperative dysfunction, rehabilitation training is needed. 1. Response to anesthesia: it is considered that the inability to bend the leg after ligament rupture surgery may be caused by the inhibition of the nervous system by anesthesia drugs, which is only temporary, and the mobility of the lower limbs can be restored gradually when the body gradually metabolizes the anesthesia drugs, therefore, no special treatment is needed in general, and the patients do not need to be overly worried. 2. Functional disorders: usually after ligament rupture surgery, patients need to rest in bed, and the inability to bend the leg may be due to the long-term inactivity of the lower limbs, resulting in joint stiffness and functional disorders. Patients need to actively cooperate with the doctor to carry out rehabilitation training, strengthen the mobility, usually can be appropriate to elevate the affected limbs, strengthen the muscle exercise. To summarize, patients with ligament rupture surgery need to strengthen their daily life management, carry out rehabilitation training as early as possible, go to the hospital for follow-up on time, and closely observe the changes in their postoperative conditions.