Question

The acetabulum is a socket for which bone?

Answer 1

Hint: The acetabulum is a concave surface that is seen in the pelvis.
The head of the femur or thigh bone meets with the pelvis at the acetabulum which forms the hip joint in the human body.

Complete answer: The acetabulum is also called cotyloid cavity.
The head of the femur meets with the pelvis at a point – the acetabulum. It forms the hip joint. Therefore, the acetabulum is the socket of the femur bone. The perforate cup-shaped opening of the acetabulum is formed on each side of the pelvic girdle where the ischium, ilium, and pubis meet.
In this socket, the head of the femur is inserted.

Additional information: The acetabulum is also home to the acetabular fossa, an attachment site for the ligamentum teres, a triangular, similar to flattened band implanted by its apex into the anterosuperior part of the fovea capitis femoris.
The notch is converted into a foramen by the transverse acetabular ligament; through the foramen, nutrient vessels and nerves engage in the joint. This is what holds the head of the femur securely in the acetabulum.

So the correct answer is femur bone.

Note: It helps in the movement of the leg and also helps to bend from the hip joint.