Anterior cruciate ligament injury can sit for a long time, but care should be taken to keep the knee joint relaxed and avoid excessive knee flexion. Inadequate warm-up, fatigue exercise, and driving with a sharp impact can lead to ACL injury, and patients may experience symptoms such as knee pain, swelling, and difficulty in walking, which can be treated by immobilization such as braces or casts, or through arthroscopic ACL reconstruction. After treatment, patients need to reduce the movement of the knee joint and pay attention to rest. Sitting for long periods of time does not usually put a serious burden on the knee joint, but care should be taken to keep the knee relaxed and avoid excessive bending of the knee. Patients with ACL injuries need to follow the doctor’s advice on treatment and rehabilitation exercises to avoid affecting recovery. If the patient experiences severe pain or other discomfort, he or she should go to the hospital in time for treatment.