It is not possible to determine whether the epiphysis is closed by clenching the fist. The main way to determine whether the epiphysis is closed is through age and X-ray examination.
1. Age: During normal growth and development, epiphyseal cartilage gradually calcifies with age, and eventually the epiphysis closes to form the epiphysis. Generally, the epiphysis reaches physiological closure at puberty, and the bone age is around 18 years old for males and 17 years old for females.
2. X-ray examination: the general plain film examination is mainly to check the knee joint front and side film, if the X-ray film shows a wide translucent band, it means the epiphysis is not closed. With age, only a thin line is found in the epiphysis, usually the epiphysis has been closed.
If you want to know whether the epiphysis is closed or not, it is recommended to go to the hospital, complete the relevant examinations, and let the professional doctor determine whether the epiphysis is closed or not.