The time of decubitus after posterior cruciate ligament reconstruction is related to age, physical strength, rehabilitation, etc. It cannot be generalized, but is generally about one and a half to four months, and needs to be gradual. 1. Age: Young people recover faster than older people and abduct early after ACL reconstruction. It usually takes one and a half months for young people, and may take four months or even longer for old people. 2. Physical strength: those with good physical strength have faster recovery progress, and the time of abduction can be advanced. Therefore, athletes generally have an earlier time of abduction than ordinary people. 3. Rehabilitation: After posterior cruciate ligament reconstruction, the timing, reasonableness and compliance of rehabilitation treatment can affect the time of abduction. Abduction should be gradual, and can be transitioned to semi-abduction or abduction through gradual weight-bearing training and balance training. After posterior cruciate ligament reconstruction, the time of abduction should be determined after regular review and evaluation by the doctor to avoid serious consequences.