Femoral nerve injury

Introduction to femoral nerve injury The femoral nerve starts from the lumbar plexus and consists of the anterior and posterior branches of the lumbar 2, 3, and 4 nerves. It is worn by the outer edge of the psoas muscle, and is obliquely descended to the deep side of the fascia, in the psoas muscle and the diaphragm. The femoral fascia sheath is reached, and the iliac muscle branch and the lumbar muscle branch are issued in the armpit. The trunk is deep in the inguinal ligament and the surface of the iliopsoas muscle. The muscle gap enters the femoral triangle and is located outside the femoral artery. The femoral nerve passes through the groin 2 to 3 cm, and the anterior and posterior branches are separated. The anterior branch is divided into the medial cutaneous nerve and the femoral cutaneous nerve, which innervates the anterior medial femoral skin and emits a branch of the sartorius muscle and pubic muscle. The posterior branch first divides the muscle branch to the quadriceps muscle, and then divides a cutaneous nerve, that is, the saphenous nerve. The saphenous nerve is accompanied by the femoral movement, the vein enters the adductor tube from the femoral triangle, and the fascia is pierced from the lower end of the tube. After the knee is located in the sartorius muscle, it is then subcutaneously with the great saphenous vein to reach the internal hemorrhoid. Femoral nerve injury is rare, and most of them are surgical injuries. The main clinical manifestations after injury are knee extension obstruction caused by quadriceps paralysis and sensory disturbance of anterior and posterior femoral medial. If it is an operation, it should be repaired as soon as possible. basic knowledge Sickness ratio: 0.05% Susceptible people: no specific population Mode of infection: non-infectious complication:

Cause of femoral nerve injury

Gunshot injuries, stab wounds, and iatrogenic injuries are common.

Femoral nerve injury prevention

Avoid trauma.

Femoral nerve injury complications Complication

The anterior medial side of the thigh and the inner side of the calf are lost and the knee is obstructed.

Symptoms of femoral nerve injury Common symptoms Can not bend the inside of the calf and feel the loss of the anterior medial and calf... Sensory disorder

1. Exercise: If the injury is above the armpit, the iliopsoas and quadriceps are both paralyzed. The performance is not able to bend the hip and stretch the knee. For example, the injury is below the branch of the diaphragm, and only the knee can not be stretched.

2. Feeling: High-level injury is characterized by loss of sensory anterior medial and medial calf, low-level injury, which may be a simple saphenous nerve injury, showing sensory disturbance of the medial calf.

3. Nutrition: The inside of the calf is susceptible to trauma, frostbite and burns.

Examination of femoral nerve injury

Electrophysiological examination: the conduction velocity of the affected side of the femoral nerve is slowed down, the amplitude is decreased, the latency of F wave or H reflection is prolonged; the latency of SEP is prolonged, the amplitude is decreased, and the inter-wavelength is prolonged; the electromyography of the femoral innervation muscle is mostly the denervation potential While the healthy side is normal.

Diagnosis and diagnosis of femoral nerve injury

History of trauma, iliopsoas and quadriceps, can not bend knees and knees, sensation of the anterior and medial and medial calf, EMG examination, to help diagnose.

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