Final answer:
In Craig's test, a tibia internal rotation (IR) of more than 15 degrees indicates femoral anteversion, as per answer choice (a). The test specifically assesses the rotation of the hip to diagnose anteversion.
Step-by-step explanation:
When performing Craig's test, if you notice the tibia is > 15 degrees IR, this means the patient has femoral anteversion. This diagnosis corresponds to answer choice (a) > 15 degrees IR; Femoral anteversion. Femoral anteversion refers to the condition where the femoral neck is tilted forward, causing the head of the femur to lead in front of the rest of the femur when walking. This is different from the conditions described in the other answer choices - femoral retroversion, hip dysplasia, and iliotibial band syndrome, which have other distinct clinical signs.
The Q-angle, although informative on the lateral deviation of the femur relative to the tibia and more pronounced in women due to their wider pelvis, is not the measure used in Craig's test but rather provides context on femoral and pelvic biomechanics.