Whether or not you can climb stairs after an ACL injury to the knee needs to be judged according to the degree of injury and cannot be generalized. If the ACL injury of the knee is mild, generally only the wear and tear of the ACL, the function of the ACL is not affected, you can go up the stairs, but you should avoid strenuous or high-pressure sports to which the knee is subjected. If the knee anterior cruciate ligament injury is more serious, or even rupture of the anterior cruciate ligament of the knee, in this case, the anterior cruciate ligament to maintain the stability of the knee joint function is lost, and can not climb the stairs, the patient should be under the guidance of the physician to carry out conservative treatment, the cruciate ligament rupture of the patient should be surgical treatment, suture ligament. Patients with anterior cruciate ligament injury of the knee are advised to consult a professional doctor to determine whether they can climb stairs according to their condition and so on.