Final answer:
The femur articulates with the acetabulum of the hip bone to form the hip joint. Additionally, it articulates with the greater trochanter.
Step-by-step explanation:
The femur, or thigh bone, is the single bone of the thigh region. Its rounded head articulates with the acetabulum of the hip bone to form the hip joint. The narrow neck joins inferiorly with the greater and lesser trochanters. The greater trochanter is a large, upward, bony projection located above the base of the neck.