X-ray of knee joint showing epiphyseal plates

X-ray of knee joint showing femur above and tibia and fibula below with knee joint. The epiphyseal plates are seen as transluscent lines near the end of the the bones (yellow arrows). The region beyond the the ephiphyseal plate and adjoining the joint is the epiphysis. The densely calcified outer region of the shaft is known as the cortex and the inner region which holds the bone marrow is known as medulla (blue arrows).

1. Blood supply of bone
2. Innervation of joint, Hilton’s law
3. Multiple air-fluid levels in intestinal obstruction
4. Safety pin appearance is seen in