Vascular contribution to the femoral head is basically due to the arteria circumflexa femoris medialis (MFCA) [1–19], coming from the ramus profundus: the postero-superior and postero-inferior retinacular vessels run along the intertrochanteric ridge, penetrating the capsule and continuing under the synovia to the bone-cartilage junction. The rounded ligament arteria and the circumflexa lateralis also contribute to the vascularization of the proximal femural epiphysis but their contribution is much lesser [1, 2, 4, 12]. Every surgical intervention that includes dislocation manoeuvers and/or circumferential capsulotomy and is meant to preserve proximal epiphysis bone must ensure preservation of the vascular axis [1–3, 21]. This can be obtained by saving and conserving the insertion of the external obturator that protects the deep branch of MCFA from excessive strain [1, 21].