Coxofemoral joint is defined as

• A. The knee joint
• B. The true hip joint
• C. The Ankle joint
• D. The Elbow joint

Answer: (B)

Coxofemoral joint refers to the hip joint—the true articulation between the femoral head and the acetabulum of the pelvis. It’s a ball-and-socket synovial joint, a multiaxial structure that allows flexion/extension, abduction/adduction, internal/external rotation, and circumduction, while bearing the body's weight during standing and movement. The socket is deepened by the acetabular labrum and stabilized by a strong capsule and ligaments, making it the primary hip joint in the body. This distinguishes it from other joints mentioned, such as the knee (tibiofemoral and patellofemoral joints), the ankle (talocrural and subtalar joints), and the elbow (humeroulnar and humeroradial joints).