Pelvic posterior tilt is produced by which muscle groups?

• A. Hamstrings and adductors
• B. Latissimus dorsi and erector spinae
• C. Abdominals and gluteus maximus
• D. Quadratus lumborum and iliopsoas

Answer: (C)

Posterior pelvic tilt happens when the front of the pelvis is pulled upward and the pelvis rotates backward. The main actors are the abdominal muscles and the gluteus maximus. The abdominal muscles (like the rectus abdominis and obliques) pull the pubic bone upward, flattening the lower back and rotating the pelvis toward a posterior position. The gluteus maximus helps by extending the hip, which, when the thigh moves backward, also drives the pelvis into a backward tilt. Together, these two muscle groups effectively tilt the pelvis posteriorly. Other muscle groups listed either don’t produce this backward-pelvis rotation or promote the opposite motion, so they aren’t the primary drivers of posterior tilt.