Objective To investigate the outcomes of avulsion fractures of posterior cruciate ligament of knee joint treated by tension band wire fixation. Methods Twenty-three patients with avulsion fractures of posterior cruciate ligament of knee joint were treated with tension band wire fixation, and the outcomes were evaluated by Lysholm knee joint scoring. Results All the patients were followed up for 6 months to 2 years. Favorable function recovery was achieved in 22 (95.7%) patients. The other senior patient suffered from osteoarthritis and narrow joint space before operation, and there still existed chronic pain and flexion-extension dysfunction after operation. Conclusion Treatment of avulsion fractures of posterior cruciate ligament of knee joint by tension band wire fixation is simple, economical and effective.