Which of the following statements accurately describes the femur?
A. the medial and lateral condyles articulate with the fibula and tibia
B. the neck is the weakest part of the bone
C. the ball-like head contains a pit called the acetabulum
D. the greater trochanter is located at the junction of the neck and shaft in a posteromedial position
E. it articulates with the pubis, sacrum ilium, and ischium
The correct answer and explanation is :
The correct answer is: B. the neck is the weakest part of the bone
Explanation:
The femur, or thigh bone, is the longest and strongest bone in the human body. It plays a crucial role in supporting the body’s weight and facilitating movement by forming joints at both the hip and knee.
Let’s evaluate each of the options:
A. The medial and lateral condyles articulate with the fibula and tibia
🔴 Incorrect. While the medial and lateral condyles of the femur do form part of the knee joint, they only articulate with the tibia, not the fibula. The fibula is located laterally and does not directly articulate with the femur.
B. The neck is the weakest part of the bone
✅ Correct. The neck of the femur, which connects the head to the shaft, is the narrowest and therefore the most structurally vulnerable part. This region is prone to fractures, especially in elderly individuals with osteoporosis. Such injuries are commonly referred to as hip fractures, though technically they occur in the femoral neck.
C. The ball-like head contains a pit called the acetabulum
🔴 Incorrect. The head of the femur is the ball-like structure that fits into the acetabulum, which is a socket in the pelvis. The acetabulum is part of the pelvic bone, not a feature of the femur itself. The femoral head does contain a fovea capitis, a small pit for ligament attachment, but not the acetabulum.
D. The greater trochanter is located at the junction of the neck and shaft in a posteromedial position
🔴 Incorrect. The greater trochanter is indeed at the junction of the neck and shaft, but it is located in a lateral (not posteromedial) position. It serves as an attachment site for several muscles.
E. It articulates with the pubis, sacrum, ilium, and ischium
🔴 Incorrect. The femur only articulates with the acetabulum of the pelvis, which is formed by the pubis, ilium, and ischium—but not with the sacrum. The sacrum forms the back part of the pelvic girdle but does not directly connect with the femur.
Thus, B is the best and most accurate choice.