Which postural deviation is associated with sacral S1-S2?

Which postural deviation is associated with sacral S1-S2?

• A. Trendelenburg
• B. Kyphosis
• C. Forward head posture
• D. Scoliosis

Answer: (A)

The key idea is that sacral nerve roots can affect the hip abductors, which are the gluteus medius and gluteus minimus. These muscles keep the pelvis level when you stand on one leg. When their function is compromised, the pelvis drops on the opposite side during single-leg stance, producing the Trendelenburg posture or gait pattern. This downward pelvis tilt underlines weakness of the stance-side abductors, a weakness that can involve the sacral nerves supplying those muscles.

Kyphosis, forward head posture, and scoliosis involve other regions and spinal mechanics that aren’t tied specifically to sacral S1–S2 innervation, so they don’t describe the sacral-root–related postural issue.