Which bone forms the posterior portion of the acetabulum?

Which bone forms the posterior portion of the acetabulum?

• A. Ilium
• B. Pubis
• C. Ischium
• D. Sacrum

Answer: (C)

The ischium is the bone that forms the posterior portion of the acetabulum, which is the socket in the hip bone that articulates with the head of the femur. In the context of hip anatomy, the acetabulum is comprised of three bones: the ilium, ischium, and pubis.

The ischium contributes significantly to the lower part of the acetabulum and plays a crucial role in supporting the weight of the body when sitting. It is located inferior and posterior to the other two bones, making it the distinct component of the acetabulum situated at the back. Understanding the anatomy of the acetabulum is essential for interpreting radiographs and diagnosing hip-related conditions, as it directly relates to the function and stability of the hip joint.