👉 "Subperiosteal" is a medical term that describes the bone and soft tissue structures located between the bone of the hip joint, the femur, and the tibia. These structures are known as periosteum or periosteous membrane, which is made up of fibrocartilage and other connective tissue cells. The subperiosteal structures include the femoral condyles (the head and tail), the patella, and the calcaneus.