Sciatic Nerve

Sciatic nerve injury leads to foot drop

 Foot drop is a gait abnormality in which the forefoot cannot be lifted off the ground . This occurs due to inability to dorsiflex the ankle and  the toes. as a result of paralysis of the muscles of the anterior compartment of leg.  Although, the most common cause of  paralysis of muscles of anterior compartment of leg is injury to common peroneal nerve (a branch of sciatic nerve) as it winds around the neck of fibula as the nerve is quite superficial.here., injury to sciatic nerve ( as in posterior dislocation of hip joint) and to  the deep peroneal nerve ( it supplies all the muscles of the anterior compartment of leg and is a branch of common peroneal nerve) also results in foot drop.

Compression of sciatic nerve results in ‘sleeping foot’.

Safe quadrant in gluteal region for giving intramuscular injections.

Intramuscular injection enables a large amount of a drug to be introduced at once but absorbed gradually. The injection site must be carefully selected to avoid injury to the underlying large vessels and nerves. In the gluteal region are given in its upper and outer quadrant to avoid injury to sciatic nerve.