Which description best explains how obturator internus length changes affect hip mechanics in a left AIC?

• A. Lengthening the left obturator internus and shortening the right obturator internus has no effect on hip mechanics
• B. Lengthening the left obturator internus and shortening the right obturator internus worsens knee alignment
• C. Lengthening the left obturator internus alone is sufficient to balance the pelvis
• D. Lengthening the left obturator internus and shortening the right obturator internus help restore balance by altering hip rotations

Answer: (D)