Which joint connects the leg to the pelvis?

The hip joint is the structure that connects the leg to the pelvis. It serves as the primary point of attachment for the lower limb, allowing for a wide range of movements such as flexion, extension, abduction, adduction, and rotation. This ball-and-socket joint, formed by the head of the femur and the acetabulum of the pelvis, provides both stability and mobility, essential for activities such as walking, running, and jumping.

Additionally, the knee and ankle joints, while important in the function and movement of the leg, do not connect the leg to the pelvis. The shoulder also does not pertain to the connection between the leg and pelvis since it is part of the upper limb and connects the arm to the shoulder girdle. Thus, the hip joint is the correct choice for its role in linking the leg to the pelvis.