Clinical Research Directory

Under ultrasound guidance, the fascial plane between the short head of the biceps femoris and the semimembranosus muscles will be identified. The needle will be advanced into this plane using a lateral approach, and 20 mL of 0.25% bupivacaine will be injected. This injection area forms an anatomical corridor encompassing the terminal sensory branches of the common peroneal nerve, the popliteal extension of the posterior femoral cutaneous nerve, and the lateral genicular nerve branches. Thus, a broad sensory block is achieved along the posterolateral capsule of the knee without affecting motor fibers.

Under ultrasound guidance, the posterior aspect of the popliteal artery at the distal femur, at the level of the femoral condyles, will be targeted. The needle will be advanced using a medial approach, and 20 mL of 0.25% bupivacaine will be injected into the potential space between the artery and the posterior capsule of the knee. This technique blocks the terminal genicular nerve branches innervating the posterior capsule while sparing motor fibers.

The block will be performed under ultrasound guidance at the distal femoral triangle, just below the apex of the femoral triangle. This level lies deep to the sartorius muscle and represents the lower boundary of the vastoadductor membrane and the beginning of the adductor canal. The ultrasound probe will be placed transversely on the medial thigh to visualize the femoral artery, and the saphenous nerve running lateral to the artery will be targeted. A total of 20 mL of 0.25% bupivacaine will be slowly injected beneath the sartorius muscle and lateral to the femoral artery to allow spread along the adductor canal. This injection at this level affects both the saphenous nerve and the motor branch of the vastus medialis, providing an effective sensory block of the anterior and medial aspects of the knee joint.