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Femoral nerve injury

Also called: Femoral nerve injury, femoral neuropathy

Damage to the nerve at the front of the thigh, causing weakness straightening the knee, a knee that buckles, and numbness on the front of the thigh.

CausesSurgery, bleeding in the pelvis, diabetes
HelpPhysical therapy, knee brace

Overview

It can follow hip or pelvic surgery, a bleed in the belly muscle, or long periods lying in one position.

Many recover over months as the nerve heals.

Symptoms

Common signs:

  • Weak thigh, knee buckles

Less common

  • Numb front of thigh
  • Trouble climbing stairs

When to get medical care

Call 911Sudden leg weakness with back or groin pain, especially on blood thinners.
Get care todayNew thigh weakness.
See a doctor soonWeakness not improving.

Causes

Nerve compression or injury.

Who is more likely to get it

  • Recent surgery
  • Diabetes
  • Blood thinners

Diagnosis

A clinician asks about your symptoms and may order tests.

The exam

A physical exam.

Tests

Tests, if needed:

  • Nerve tests (EMG):
  • CT or MRI: If a bleed is possible.

Treatment

Treatment depends on the cause and how severe it is.

Self-care

  • Use a knee brace or cane
  • Do physical therapy
  • Make stairs safe

Which doctor treats this

  • Urgent care or the ER can treat it first. For minor problems, your primary care provider can help.
  • They may send you to a neurologist (brain and nerve doctor).

Living with it

Support groups and helplines

Back to school, work, or sports

  • Recovery time varies. Ask your care team when you can drive, lift, work, and exercise.

Children, pregnancy, and older adults

  • People on blood thinners: A bleed can press the nerve.

Outlook

Many recover in months.

Getting ready for your visit

Bring a list of your symptoms and medicines.

What to bring

  • A list of your medicines and supplements
  • Notes on when symptoms started and what makes them better or worse

Questions to ask

  • What's causing this?
  • What treatment do you recommend?

Research studies

Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.

Search ClinicalTrials.gov for studies on Femoral nerve injury

Sources

Last updated 2026-11-12.