Which of the following is NOT a function of the gluteal muscles?

The gluteal muscles play a significant role in various movements of the hip and lower body. Hip extension, hip abduction, and hip external rotation are all primary functions of the gluteal muscles, particularly the gluteus maximus, gluteus medius, and gluteus minimus.

Hip extension primarily involves the gluteus maximus, which is the largest muscle in the group, and is essential for activities such as standing up from a seated position, climbing stairs, and running. Hip abduction is mainly performed by the gluteus medius and minimus, enabling movements away from the body's midline, which is crucial for stabilizing the pelvis during activities like walking and running. Hip external rotation is another function attributed to the gluteus maximus and other smaller muscles, assisting in movements that require turning the leg outward.

Knee flexion, on the other hand, is not a function of the gluteal muscles. This action is primarily facilitated by the hamstrings and other musculature in the posterior thigh, which are responsible for bending the knee. Thus, identifying knee flexion as not a function of the gluteal muscles aligns with their anatomical and functional roles in lower body mechanics.