A decreased pelvic angle indicates a posterior pelvic tilt, which is associated with decreased hamstring muscle length. Which of the following statements best reflects this relationship?

• A. Increased hamstring length
• B. Decreased hamstring length
• C. No change in hamstring length
• D. Increased hip flexor tightness

Answer: (B)

A posterior pelvic tilt changes the hip position in a way that shortens the hamstrings. The hamstrings attach to the pelvis (at the ischial tuberosity) and cross both the hip and the knee. When the pelvis tilts backward, the orientation of the hip joint is such that the distance the hamstrings must span is reduced, effectively shortening their resting length. That means a decreased pelvic angle is associated with decreased hamstring length (the hamstrings become shorter or tighter).

So the statement that best reflects this relationship is that hamstring length is decreased. If hamstrings were longer, you’d expect the pelvis to sit more in anterior tilt; no change in length wouldn’t capture the anatomical linkage, and hip flexor tightness isn’t the direct reflection of this pelvis–hamstrings relationship.