An orthopedic DR of both knees can be used to determine whether the epiphyses are closed by looking at the disappearance of the epiphyses.
The epiphyses are located in the knee joint at the distal femur and proximal tibia, and are important for the growth of long bones. If the epiphysis is not closed, the epiphyseal plate at the distal femur and proximal tibia can be seen in the orthogonal DR of the knee, which is a cartilaginous tissue that looks like an epiphysis that is not connected to the long bone stem.
With age, the epiphyseal plate gradually thins until it becomes a line and then disappears. Generally the epiphysis closes around the age of 18 years, but in some people it can extend until the age of 22 years.
Determining whether an epiphysis is closed by using a bilateral orthogonal knee DR epiphysis will tell you if your child can continue to grow, but you will also need to have your DR interpreted by your doctor and follow his or her instructions.