Leg Swelling (one leg) Anatomy
To better understand leg swelling (unilateral), it helps to understand the anatomy of the leg.
The entire leg contains four bones:
The thigh contains the largest bone in the body, called the femur. The femur begins at the hip and ends at the knee. The muscles of the thigh control movement of the knee and hip. The patella, or kneecap, protects the front of the knee.
The lower leg contains two long bones, called the tibia and fibula. The muscles of the lower leg control movement of the foot and ankle.
Leg anatomy examples: