Loss of sensation in the medial calf is one of the symptoms of a high level femoral nerve injury. High femoral nerve injury presents as loss of sensation in the anterior medial femur and medial calf. Muscle and joint position sensation, motion sensation, and vibration sensation. If the nerve fiber that conducts deep sensation or the sensory center of the brain is damaged, muscle and joint position sensation and motion appear. Gunshot wounds, stab wounds, and medically induced injuries are common. Loss of sensation in the lateral calf and dorsum of the foot is one of the findings in the diagnosis of common peroneal nerve injury. Diagnosis of common peroneal nerve injury: history of injury, due to paralysis of calf extensor group and peroneal long and short muscles, showing foot drop inversion, loss of sensation in the lateral calf and dorsal foot …… loss of sensation in the medial calf is one of the symptoms of high femoral nerve injury. Femoral nerve injury high injury. The following diseases may also be the cause of loss of sensation in the medial calf: 1. Femoral nerve injury The femoral nerve starts from the lumbar plexus and consists of the posterior strands of the anterior branches of the lumbar 2, 3, and 4 nerves, which penetrate from the outer edge of the lumbaris major muscle, travel obliquely downward on the deep surface of the iliac fascia, reach the femoral fascia sheath between the lumbaris major muscle and the iliac muscle, send out the iliac muscle branch and the lumbaris major branch in the iliac fossa, and the trunk enters the femoral triangle through the deep surface of the inguinal ligament, the surface of the iliopsoas muscle, and the muscle gap The main trunk passes through the deep surface of the inguinal ligament, the surface of the iliopsoas muscle, and enters the femoral triangle by the muscle gap, and lies lateral to the femoral artery. The femoral nerve crosses 2-3 cm behind the groin and divides into anterior and posterior branches. The anterior branch is divided into the medial femoral cutaneous nerve and the middle femoral cutaneous nerve, which innervate the anterior medial femoral skin and send out motor branches to innervate the suture and pubococcygeus muscles. The saphenous nerve accompanies the femoral artery and vein from the femoral triangle into the adductor canal, penetrates the fascia from the lower end of the canal, lies behind the suture muscle at the knee, and then travels subcutaneously with the saphenous vein to the inner ankle. The most important nerves in the lower extremity are the femoral nerve in the front and the sciatic nerve in the back. Lower extremity nerve injury is much less than upper nerve injury. Sciatic nerve injury is composed of lumbar medulla 4, 5 and sacral medulla 1, 2, 3 nerve roots. Cause of injury: mostly caused by femoral or hip firearm injury, sometimes hip dislocation and pelvic fracture can also be combined with sciatic nerve injury. 3, lumbar spondylosis Lumbar spondylosis is a disease caused by acute and chronic injury to the spine and soft tissues around the spine or lumbar disc degeneration, lumbar spine osteophytes and other causes, clinically manifested as lumbar pain, lumbar activity restriction and lumbar leg pain as the main symptoms. The medical term “lumbar spondylosis” covers “lumbar soft tissue strain, lumbar myofasciitis, lumbar degenerative osteoarthropathy, lumbar triple transverse synovial syndrome, lumbar disc herniation, acute lumbar sprain, pear-shaped muscle syndrome, lumbar tuberculosis and other disorders.