1. There was reason to believe, on the basis of angiography in autopsy material, that the frog-leg position interfered with arterial filling in the hip area.
2. This effect appeared more marked in the presence of adductor resistance.
3. The arteries affected by the position were the medial femoral circumflex, the lateral femoral circumflex, and the profunda femoris.
4. Adductor tenotomy proved to be an aid in abolishing the effect of the frog-leg position upon the arterial circulation to the hip area.