Neurology
Meralgia Paresthetica
외측대퇴피신경통
Compression of lateral femoral cutaneous nerve at inguinal ligament
- How common
- 4/100k/year; risk: obesity, pregnancy, DM
- Typical age
- Ages 30–60
What is it?
LFC nerve is entrapped/stretched as it passes under the inguinal ligament near the ASIS.
Commonly affected: Anterolateral thigh (sensory only, no motor)
How it develops
- Nerve compressionEntrapped under inguinal ligament
- Mechanical irritationTight clothing, belts, abdominal obesity
- Neural ischemiaLocal microvascular ischemia
- Sensory disturbanceBurning paresthesia of lateral thigh
Symptoms
- Burning painBurning over lateral thigh
- NumbnessReduced sensation in same area
- Worse standingWorse with prolonged standing/walking
- Normal motorNormal strength/reflexes (sensory nerve)
How it is examined
- Sensory mappingMap lateral thigh sensation
- Nerve block testDiagnostic LFC nerve block
- Normal motor examMotor deficit suggests alternative dx
Imaging
Plain imaging not required.
- N/A
Pelvic/lumbar MRI if uncertain (rule out disc).
- Normal
Non-surgical care
- Weight lossReduce abdominal obesity
- Loose clothingAvoid tight belts/clothing
- MedicationsGabapentin/pregabalin for neuropathic pain
- Local nerve blockLidocaine/steroid injection
Conservative options are generally tried first. Medications listed here can have side effects — discuss them with your prescriber.
When surgery is considered
Refractory (rare)
Procedures that may be discussed
- Neurolysis (decompression)
- Neurectomy
Outlook
Most respond to conservative care; weight loss improves outcome.