Femoral Nerve Anatomy and Lesions

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Questions and Answers

Which nerve roots contribute to the formation of the femoral nerve?

  • L1-L3
  • L2-L4 (correct)
  • L4-S1
  • L3-L5

A patient presents with weakness in knee extension and loss of patellar reflex. These findings are most likely indicative of a lesion affecting which nerve?

  • Superior gluteal nerve
  • Sciatic nerve
  • Femoral nerve (correct)
  • Obturator nerve

Which of the following muscles does the femoral nerve innervate?

  • Biceps femoris
  • Gluteus maximus
  • Rectus femoris (correct)
  • Adductor magnus

A patient reports sensory loss on the anteromedial aspect of the thigh and leg. Which nerve is most likely involved?

<p>Saphenous nerve (B)</p> Signup and view all the answers

Which of the following conditions is characterized by compression of the lateral femoral cutaneous nerve?

<p>Meralgia paresthetica (B)</p> Signup and view all the answers

Which activity would most likely aggravate the symptoms of meralgia paresthetica?

<p>Walking or standing for prolonged periods (D)</p> Signup and view all the answers

What is a common location for compression of the lateral femoral cutaneous nerve in meralgia paresthetica?

<p>Inguinal ligament (C)</p> Signup and view all the answers

A patient with meralgia paresthetica reports relief when sitting. What is the most likely reason for this?

<p>Slackening of tissue around the inguinal ligament (C)</p> Signup and view all the answers

In assessing a patient for meralgia paresthetica, where should a Tinel's test be performed to assess the lateral femoral cutaneous nerve?

<p>Inguinal ligament, medial to ASIS (A)</p> Signup and view all the answers

Which of the following is a common symptom associated with restless leg syndrome (RLS)?

<p>An irresistible urge to move the legs (B)</p> Signup and view all the answers

Which time of day do the symptoms of restless leg syndrome typically worsen?

<p>Evening or night (C)</p> Signup and view all the answers

Which of the following is a potential aggravating factor for restless leg syndrome?

<p>Consumption of stimulants like coffee (C)</p> Signup and view all the answers

Which of the following is a recommended treatment for restless leg syndrome?

<p>Taking iron supplements for deficiencies (D)</p> Signup and view all the answers

A patient is diagnosed with axonotmesis of the Femoral nerve. As a massage therapist, what precaution is MOST important considering the nerve damage?

<p>Avoid mobilizing the nerve due to severe symptoms (C)</p> Signup and view all the answers

In assessing a person presenting with possible Meralgia paresthetica, palpation over which anatomical structure is MOST likely to reproduce their symptoms?

<p>Inguinal ligament (A)</p> Signup and view all the answers

What action could be performed to slacken the tissue around the inguinal ligament, potentially providing relief in cases of meralgia paresthetica?

<p>Posterior pelvic tilt (B)</p> Signup and view all the answers

Which of the following best describes the sensory distribution of the lateral femoral cutaneous nerve?

<p>Anterolateral thigh (B)</p> Signup and view all the answers

A patient presents with pain and sensory changes in the anterolateral thigh, but no motor deficits. What is the MOST likely condition?

<p>Meralgia paresthetica (B)</p> Signup and view all the answers

Which of the following is a characteristic sign or symptom of a femoral nerve lesion?

<p>Weakness in knee extension (A)</p> Signup and view all the answers

A patient has undergone an inguinal hernia repair and now presents with symptoms of meralgia paresthetica. What is the MOST likely cause of the nerve compression?

<p>Iatrogenic injury during surgery (B)</p> Signup and view all the answers

Which of the following statements is MOST accurate regarding the position of the lateral femoral cutaneous nerve in relation to the ASIS?

<p>It is lateral to, and quite close to, the ASIS. (D)</p> Signup and view all the answers

The femoral nerve is typically in the middle of which two bony landmarks?

<p>ASIS and pubis (B)</p> Signup and view all the answers

What is the primary function of the Lateral Femoral Cutaneous Nerve?

<p>Sensory function to the skin over the lateral thigh (B)</p> Signup and view all the answers

Which category of nerve injury is typically associated with internal compression from soft tissue or external compression from clothing/belts/equipment?

<p>Neuropraxia (D)</p> Signup and view all the answers

Which activity should be avoided in the acute stage of meralgia paresthetica treatment?

<p>Deep palpation over inguinal ligament reproduces symptoms (C)</p> Signup and view all the answers

A client reports symptoms of Restless Leg Syndrome (RLS). Which lifestyle modification is MOST appropriate to suggest?

<p>See MD to assess for nutritional deficiencies (D)</p> Signup and view all the answers

Which of these is an accurate description of the pathway of the femoral nerve?

<p>Lumbar plexus, travels through psoas major, behind the inguinal ligament, through femoral triangle (A)</p> Signup and view all the answers

Which test biases the Saphenous nerve?

<p>Prone knee extension test (A)</p> Signup and view all the answers

Which of the following signs and symptoms are associated with Femoral nerve lesions?

<p>Anteromedial thigh, muscle wasting, loss of patella DTR (L4) (B)</p> Signup and view all the answers

Which test biases the Femoral nerve?

<p>Prone knee bending test (D)</p> Signup and view all the answers

Which of the following muscles are MMTS tested with a Femoral nerve assessment?

<p>Quadriceps, Pectineus, Sartorius, Illiacus (D)</p> Signup and view all the answers

During a Femoral Nerve Assessment, what signs or symptoms would you look for to indicate a sensory issue?

<p>Muscle weakness, Sensory assessment in affected areas, DTR (A)</p> Signup and view all the answers

During an assessment, your client describes their pain as aggravated by walking, standing, and relieved by sitting. Where is their potential pain located?

<p>Vastus Lateralis, Upper Lateral Thigh, Vastus Intermedialis (D)</p> Signup and view all the answers

When treating a Meralgia Paresthetica condition, what is your focus?

<p>Focus on decompression (C)</p> Signup and view all the answers

Which of the following would be an appropriate treatment for Meralgia Paresthetica?

<p>Injections (steroid or nerve block), or conservative management, weight loss (D)</p> Signup and view all the answers

In Meralgia paresthetica, radiculopathy is related to which dermatome?

<p>L2 (C)</p> Signup and view all the answers

What Homecare would you provide, for someone who is experiencing symptoms of Lateral Femoral Cutaneous Nerve?

<p>lift skin and flex hip standing (D)</p> Signup and view all the answers

Which of the following conditions may lead to a compression of the femoral nerve?

<p>Space-occupying lesion in the iliopsoas region (B)</p> Signup and view all the answers

Which sign confirms if it is very badly irritated, working in the area may exacerbate symptoms?

<p>Working is not causing damage or delaying recovery, but may not be tolerable to the person (B)</p> Signup and view all the answers

When performing the Prone Knee Extension Test, which nerve are you biasing for?

<p>Saphenous Nerve (A)</p> Signup and view all the answers

Flashcards

Femoral Nerve Pathway

L2-L4, travels through psoas major, behind the inguinal ligament, through the femoral triangle.

Femoral Nerve Branches

Motor branch to anterior thigh; Sensory branch to thigh and leg; Articular branch to hip and knee.

Muscles supplied by Femoral Nerve

Iliacus, Pectineus, Sartorius, Rectus femoris, Vastus medialis/lateralis/intermedius

Femoral Nerve Sensory Function

Lateral cutaneous nerve (anterolateral thigh); Saphenous nerve (anteromedial thigh and leg).

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Types of Femoral Nerve Lesions

Neuropraxia, Axonotmesis, Neurotemesis.

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Motor signs of Femoral Nerve Lesions

Quadriceps weakness, loss of patella DTR, loss of coordination, loss of knee extension, muscle wasting

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Sensory signs of Femoral Nerve Lesions

Anteromedial thigh and medial lower leg/foot numbness, pain usually at inguinal ligament.

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MMT assessment of Femoral Nerve

Quadriceps, Pectinus, Sartorius, Illiacus.

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Meralgia Paresthetica

Compression of the lateral femoral cutaneous nerve at the inguinal ligament.

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Meralgia Paresthetica symptoms

Numbness, paresthesia, burning pain in the upper, lateral thigh, usually unilateral.

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Trigger points in Meralgia Paresthetica

Vastus lateralis, vastus intermedialis, TFL, Glute med.

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Meralgia Paresthetica Precautions

Avoid further irritation, increasing symptoms, mobilizing axonotmesis/neurotmesis.

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Meralgia Paresthetica Treatment

Relaxation techniques, inguinal ligament release, MFR to Quads/Sartorius/Iliacus, ADL modifications

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Meralgia Paresthetica Assessment

Pelvic compression test, Tinel's test

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Restless Leg Syndrome

Neurological disorder with noxious leg sensations and an irresistible impulse to move.

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Restless Leg Syndrome Sensations

Burning, creeping, tugging, insects crawling.

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Restless Leg Syndrome Treatment

relaxation focused massage, decrease stimulant consumption, MD assessment for nutritional deficiencies, good sleep hygiene

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Meralgia Paresthetica Etiology

Tight clothing, pregnancy, inguinal hernia repair, trauma

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Lateral Femoral Cutaneous Nerve Anatomy

The lateral femoral cutaneous nerve comes from the lumbar plexus, from nerve roots L2-L3.

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Lateral Femoral Cutaneous Nerve Sensory Function

Skin over the lateral thigh.

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Meralgia Paresthetica Etiology

Entrapment at inguinal ligament, trauma - seat belt in MVA

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Meralgia Paresthetica Treatment

Skin rolling of lateral thigh, cross-hands around ilium/inguinal ligament.

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Meralgia Paresthetica Home care

ADLs around external compression sources (clothes, belts, equipment).

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Study Notes

Femoral Nerve - Anatomy

  • Lumbar plexus origin at L2-L4
  • Travels through psoas major and behind the inguinal ligament
  • Passes through the femoral triangle
  • Branches include articular branches to hip and knee, motor branches to anterior thigh, and sensory branches to thigh and leg

Femoral Nerve Motor Function

  • Innervates the iliacus, pectineus, sartorius, rectus femoris, vastus medialis, vastus lateralis, and vastus intermedialis muscles

Femoral Nerve Sensory Function

  • Lateral cutaneous nerve supplies the anterolateral thigh
  • Saphenous nerve supplies the anteromedial thigh and leg

Causes of Femoral Nerve Lesions

  • Neuropraxia, axonotmesis, or neurotemesis
  • Fractures of the femur or pelvic bones
  • Surgeries
  • Compression from the iliopsoas muscle or inguinal ligament
  • Space-occupying lesions

Femoral Nerve Lesions Signs & Symptoms

  • Motor signs include quadriceps weakness, loss of patella Deep Tendon Reflex (DTR) at L4, loss of coordination, loss of knee extension and some hip flexion, and muscle wasting
  • Sensory signs include altered sensation in the anteromedial thigh, medial lower leg, and foot
  • Pain may be present at the inguinal ligament

Femoral Nerve Assessment

  • Patellar DTR assessment
  • Manual Muscle Tests (MMTs) of the quadriceps, pectineus, sartorius, and iliacus
  • Sensory assessment in affected areas
  • Prone knee bending test which biases the femoral nerve
  • Prone knee extension test which biases the saphenous nerve
  • Femoral nerve traction test (side-lying, passive knee flexion and hip extension)

Meralgia Paresthetica

  • Compression of the lateral femoral cutaneous nerve (from posterior division of ventral rami L2-L3)
  • Usually compressed at the inguinal ligament
  • Can result from trauma (e.g., seat belt in MVA), pregnancy, birth, tight clothing, heavy equipment belts, or inguinal hernia repair

Meralgia Paresthetica Signs & Symptoms

  • No motor deficits
  • Sensory symptoms in the upper, lateral thigh: numbness, paresthesia, and burning pain
  • Usually unilateral
  • Aggravated by walking or standing
  • Relieved by sitting or slackening tissue around the inguinal ligament

Meralgia Paresthetica Differential Diagnosis

  • Trigger points in vastus lateralis, vastus intermedialis, TFL, or glute med
  • L2 radiculopathy
  • Lumbar cutaneous nerve injury

Meralgia Paresthetica Precautions

  • Avoid further irritation to the nerve
  • Avoid increasing symptoms
  • Avoid mobilizing in axonotmesis or neurotmesis cases with persistent, severe symptoms

Meralgia Paresthetica Assessment

  • Sensory assessment in nerve distribution area
  • Tinel's test: tap at the inguinal ligament, medial to ASIS, to elicit tingling in the nerve
  • Pelvic compression test: deep palpation over inguinal ligament reproduces symptoms
  • Hip extension may exacerbate symptoms

Meralgia Paresthetica Treatment

  • Focus on decompression and relaxation
  • Inguinal ligament release and myofascial release (MFR) for quads, sartorius, and iliacus
  • May pillow legs into hip flexion
  • Sensory stimulation
  • ADL modifications
  • Posterior pelvic tilt may slacken the inguinal ligament

Restless Leg Syndrome

  • Neurological disorder with noxious sensations in the leg without external stimuli
  • May be CNS related
  • Sensations include burning, creeping, tugging, and insects crawling
  • Irresistible impulse to move or shift for relief
  • Often worse in the evening or at night, or during long periods of rest
  • May have a genetic component; women are more affected than men, usually older adults
  • Possible associations include iron, vitamin B12, or folic acid deficiency, kidney failure, diabetes, Parkinson's, peripheral neuropathy, or pregnancy
  • May be aggravated by stimulants (coffee, alcohol, tobacco)

Restless Leg Syndrome Treatment

  • Relaxation-focused massage
  • Decreasing stimulants
  • See MD to assess nutritional deficiencies
  • Maintaining good sleep hygiene
  • Regular exercise (not too close to bedtime)
  • Hydro-warm or cool (no extreme temperatures)

Lateral Femoral Cutaneous Nerve - Anatomy

  • Comes from the lumbar plexus, nerve roots L2-L3, a sensory nerve without motor fibers
  • Located between anterior superior iliac spine (ASIS) and femoral nerve, more lateral and close to the ASIS
  • Femoral nerve typically in the middle of the ASIS and the pubis, just lateral to the femoral artery

Lateral Femoral Cutaneous Nerve Function

  • Only sensory function for the skin over the lateral thigh

Grade of Injury Lateral Femoral Cutaneous Nerve

  • Can be any grade of nerve injury
  • Neuropraxia normally results from internal or external compression like clothes or belts
  • Axonotmesis or Neurotmesis normally results from iatrogenic causes such as post-surgery, post-injections, or due to conditions like diabetes or other metabolic pathologies

Etiology of Lateral Femoral Cutaneous Nerve

  • Meralgia Paresthetica is a compressive mononeuropathy with burning pain in the anterolateral thigh
  • Goal is to alleviate compression occurring below the inguinal ligament or due to tight clothes/belts/equipment
  • Treatment includes surgical decompression, injections (steroid, or nerve block), or conservative management such as weight loss, physio, massage therapy

Lateral Femoral Cutaneous Nerve Signs and Symptoms

  • Most common entrapment at the inguinal ligament
  • Trauma (seat belt in MVA)
  • Pregnancy; delivery - hips in flexion
  • Tight clothing
  • Surgery - hernia
  • Incidence is much higher in people with diabetes
  • Symptoms occur in the upper lateral thigh and can include numbness, paresthesia, burning pain
  • Walking & standing aggravate symptoms
  • Usually unilateral
  • Trigger points - vastus lateralis, vastus intermedius, glute min, TFL

Lateral Femoral Cutaneous Nerve Differential Diagnosis

  • Radiculopathy - L2 dermatome
  • Lumbar cutaneous nerves (iliohypogastric, subcostal) will have associated low back pain wrapping around obliques and be more proximal than the LFC distribution

Lateral Femoral Cutaneous Nerve Precautions

  • Do not irritate an irritated nerve
  • Applying pressure in the area of the nerve should not increase symptoms
  • Stop decompressing or mobilizing the nerve directly if persisting symptoms occur from the pressure applied
  • Ask how quickly symptoms dissipate after you remove your pressure

Lateral Femoral Cutaneous Nerve Treatment

  • Skin rolling the entire lateral thigh
  • Cross-hands around ilium / inguinal ligament and abdomen
  • Treat active TrP which refer into area
  • Bow inguinal ligament
  • Thigh 3D wringing either supine or supine with flexion
  • Side-lying lift skin and mobilize nerve (hip flex-ext)
  • Supine lift skin and mobilise nerve (knee flex-ext)
  • Modify techniques to suit the healing stage and severity of the condition
  • The more acute or severe, the less direct the attempt to decompress or mobilize tissue

Lateral Femoral Cutaneous Nerve Homecare

  • Modify ADLs around external compression sources (clothes, belts, equipment)
  • Encourage posterior tilt of pelvis to slacken inguinal ligament
  • Lift skin and flex hip standing

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