Loss of sensation on the outside of the calf and dorsum of the foot

Introduction Loss of the lateral and inferior sensation of the lower leg is one of the results of the diagnosis of common peroneal nerve injury. Common peroneal nerve injury is often caused by trauma, mainly characterized by sagging of the foot, walking across the gait; the ankle joint can not stretch and eversion, the toe can not stretch; the outer side of the calf and the back of the foot feels weak or missing; The lateral muscles of the lower leg are atrophied.

Cause

Cause

The common peroneal nerve is the branch of the sciatic nerve. Because the common peroneal nerve is in the neck of the humerus, the position is superficial, and on the surface of the bone, the surrounding soft tissue is less likely to be damaged in the soft tissue. Such as splint, gypsum crush and surgical accidental injury; knee joint ligament injury combined with common peroneal nerve injury is not uncommon; critically ill patients stay in bed for a long time, the lower extremity can also be crushed in the external rotation position.

an examination

Related inspection

Electromyography temperature sensation pain kinesis muscle tension examination

Other auxiliary inspection

Electrophysiological examination: the total nerve conduction velocity of the affected side is slowed down, the amplitude is decreased, the latency of F wave or H reflection is prolonged; the SEP latency is prolonged in the health search, and the wave amplitude is prolonged; the electromyography of the common peroneal nerve is mostly Loss of nerve potential, while the healthy side is normal.

Ultrasound can accurately show the peripheral nerves, especially the common peroneal nerve, which can provide clinical morphological data of the general neuropathological conditions, which can provide a reference for surgical treatment.

Differential diagnosis

Diagnosis of common peroneal nerve injury: History of injury, due to the extensor muscles of the calf and the long and short tendons of the humerus, the ptosis of the foot, the lateral and back of the calf are lost. Electromyography can determine the extent of injury and injury.

The feeling of losing the calf can be divided into the lateral and the dorsal and medial anterior medial and medial calf, so it should be noted. High-level lesions in the femoral nerve injury manifested as loss of sensory anterior medial and medial calf. Low-level injury, which can be a simple saphenous nerve injury, manifests the sensory disturbance of the medial calf. The femoral nerve comes from the lumbar plexus, descending along the surface of the diaphragm, penetrating the inguinal ligament and dividing it into the anterior and posterior 3-4cm femoral arteries. It occupies the sartorius muscle, the quadriceps muscle, the cutaneous branch to the anterior part and the hidden The innervation of the inner skin of the calf. 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.

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