Which muscles are responsible for flexion of the hip?

The iliacus and psoas major collectively form the iliopsoas muscle group, which is a primary flexor of the hip joint. This muscle group plays a crucial role in bringing the thigh towards the torso, which is essential during activities such as walking, running, and climbing stairs. The iliacus originates from the iliac fossa of the pelvis, while the psoas major originates from the lumbar vertebrae, and together they insert into the lesser trochanter of the femur.

The effectiveness of the iliopsoas in hip flexion is significant due to its anatomical position and functionality. It is one of the strongest hip flexors, working synergistically to ensure the smooth movement of the hip joint. Each of these muscles contributes to flexing the hip, highlighting the importance of the iliopsoas group in this specific action.