Lumbosacral nerve injury symptoms?

summary

The upper segment of lumbosacral plexus is lumbar plexus, which is located in the deep part of psoas major muscle and in front of lumbar transverse process. It is composed of the anterior branches of the first, second and third lumbar nerves and most of the anterior branches of the fourth lumbar nerve. The lower segment of the lumbosacral plexus is the sacral plexus, which is composed of the small part of the 4th anterior branch of the lumbar nerve, the 5th anterior branch of the lumbar nerve and the 1st, 2nd and 3rd anterior branches of the sacral nerve. Because of the deep location, the damage is rare. Different from brachial plexus root, which is easily injured by traction and displacement, it has strong resistance to general traumatic force because of the protection of pelvic bone structure.

Lumbosacral nerve injury symptoms?

1. Injury of femoral nerve (1) weakness of hip flexion, inability to stretch knee joint while sitting. Unable to step and jump, difficult to walk. (2) sensory disturbance of skin in front of thigh and inside of leg. (3) patella protrudes when quadriceps atrophy is obvious. (4) the knee jump reflex disappeared.

2. Obturator nerve injury (1) the adductor muscles of the thigh were paralyzed, the thigh could not adduct, and it was difficult for the affected limb to cross with the healthy limb. (2) there was sensory disturbance in the medial thigh skin, but there was no hypoesthesia area because of the innervation of the cutaneous branch of the femoral nerve in the medial thigh skin.

1. Tibial nerve injury (1) foot can not be plantar flexion, varus force is weak, can not stand or walk with the toe. (2) "hook foot" deformity, foot dorsiflexion and valgus. In the late stage after injury, due to the contracture of the posterior group muscle of the leg, the foot presented forced plantar flexion and varus, unable to dorsiflexion and valgus, resulting in "equinovarus" deformity.

matters needing attention

According to the definite history of trauma, especially unstable pelvic fracture, posterior ring fracture and clinical manifestations, combined with nervous system examination, electrophysiological examination and imaging examination, the diagnosis can be made. The early diagnosis of unstable pelvic fracture is difficult, and it is not noticed until the condition is stable. Therefore, careful nervous system examination should be carried out to avoid missed diagnosis.