Study: NCT04631822

Intervention type: PROCEDURE
Group type: ACTIVE_COMPARATOR
Intervention: Spinal anaesthesia
Description: spinal anesthesia shall be conducted with 2.5 ml 0.5% hyperbaric bupivacaine at the L3/4 interspaces in the setting position.

Intervention type: PROCEDURE
Group type: ACTIVE_COMPARATOR
Intervention: Spinal anaesthesia
Description: spinal anesthesia shall be conducted with 2.5 ml 0.5% hyperbaric bupivacaine at the L3/4 interspaces in the setting position.

Intervention type: PROCEDURE
Group type: ACTIVE_COMPARATOR
Intervention: ultrasound-guided Adductor Canal Block + dexamethasone
Description: Ultrasound blocks will be done immediately after spinal anesthesia, before surgical intervention. A high-frequency linear ultrasound transducer was placed transverse to the longitudinal axis of the extremity at the midthigh level at a distance approximately halfway between the iliac spine and the patella. The femoral artery was identified underneath the sartorius muscle with the vein just underneath the artery. At this position, the saphenous nerve was placed lateral to the artery in the adductor canal (Fig. 1). A 10 cm Tuohy canula 18G Gauge (Braun Medical, Melsungen, Germany) was inserted, in plane, from the lateral side of the transducer, through the sartorius muscle with the tip placed lateral to the artery. then, a 20-ml mixture of 0.25% bupivacaine, and 4 mg dexamethasone will be injected.

Intervention type: PROCEDURE
Group type: ACTIVE_COMPARATOR
Intervention: ultrasound-guided Adductor Canal Block + dexmedetomedine
Description: Ultrasound blocks will be done immediately after spinal anesthesia, before surgical intervention. A high-frequency linear ultrasound transducer was placed transverse to the longitudinal axis of the extremity at the midthigh level at a distance approximately halfway between the iliac spine and the patella. The femoral artery was identified underneath the sartorius muscle with the vein just underneath the artery. At this position, the saphenous nerve was placed lateral to the artery in the adductor canal (Fig. 1). A 10 cm Tuohy canula 18G Gauge (Braun Medical, Melsungen, Germany) was inserted, in plane, from the lateral side of the transducer, through the sartorius muscle with the tip placed lateral to the artery.then, a 20-ml mixture of 0.25% bupivacaine, and 0.5 Mg/kg dexmedetomidine will be injected.

Intervention type: PROCEDURE
Group type: ACTIVE_COMPARATOR
Intervention: ultrasound-guided Adductor Canal Block
Description: Ultrasound blocks will be done immediately after spinal anesthesia, before surgical intervention. A high-frequency linear ultrasound transducer was placed transverse to the longitudinal axis of the extremity at the midthigh level at a distance approximately halfway between the iliac spine and the patella. The femoral artery was identified underneath the sartorius muscle with the vein just underneath the artery. At this position, the saphenous nerve was placed lateral to the artery in the adductor canal (Fig. 1). A 10 cm Tuohy canula 18G Gauge (Braun Medical, Melsungen, Germany) was inserted, in plane, from the lateral side of the transducer, through the sartorius muscle with the tip placed lateral to the artery.then, a 20-ml mixture of 0.25% bupivacaine