Which pelvic movement would affect the curvature of the spine by tilting backward?

The posterior pelvic tilt is the movement that results in a backward tilt of the pelvis, which influences the curvature of the spine. When the pelvis tilts posteriorly, it decreases the lumbar lordosis by flattening the lower back. This motion shifts the pelvis backward and can lead to a more neutral position of the spine, reducing excessive curvature.

Understanding the mechanics of posterior pelvic tilt is essential because it often engages the abdominal muscles, which can stabilize the spine and pelvis. This movement can be particularly relevant in assessing posture and can help alleviate lower back discomfort associated with excessive anterior pelvic tilt or hyperlordosis. In contrast, other pelvic movements, such as anterior pelvic tilt or lateral pelvic tilt, would either increase spinal curvature or alter the alignment in different ways that do not contribute to a backward tilt of the pelvis.