Replacement of meniscus mostly refers to knee arthroplasty, how many years the postoperative prosthesis can be used is mainly related to the use of the situation, such as body weight, age, activity level, under normal circumstances can be used for 15 years ~ 20 years, long time can be up to 30 years or so, and only about 5 years in serious cases. With the advancement of material science, the service life of the prosthesis after knee replacement has been gradually improved, and the current prosthesis has a life expectancy of 15 to 20 years under normal use. For older, lighter people who do not engage in regular weight-bearing activities, the service life of the knee prosthesis is relatively long, up to about 30 years, because of less wear and tear on the knee prosthesis. For those who are younger, obese or often do heavy physical activities, the life span of the prosthesis will be reduced accordingly because there is more wear and tear on the prosthesis during daily use, and in severe cases, the life span will only be about 5 years. Matters related to the aftermath of knee replacement surgery, it is recommended to consult a doctor in time, under the guidance of the doctor.