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USMLE MSK Nerve Injuries

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rizubuta's version from 2017-05-11 22:36

Upper Extremity Nerve Injuries

NerveAnswerQuestionNumber
AxillaryC5-6Nerve Roots2
RadialC5-T1Nerve Roots5
MedianC5-T1Nerve Roots5
UlnarC8-T1Nerve Roots2
MusculocutaneousC5-7Nerve Roots3
AxillaryFractured surgical neck of humerus/dislocation of humeral headTypical injury2
RadialFractured midshaft of humerus/compression of axilla by chair-crutchesTypical injury2
MedianFracture of supracondylar humerusTypical injury1
UlnarFracture of epicondyle of humerusTypical injury1
MusculocutaneousUpper trunk compressionTypical injury1
AxillaryDeltoid (arm abduction)Motor deficit1
RadialBEST/Brachioradialis/Extensors/Supinator/TricepsMotor deficit4
MedianOpposition of thumb/Lateral finger flexion/wrist flexionMotor deficit3
UlnarMedial finger flexion/wrist flexionMotor deficit2
MusculocutaneousBiceps/brachialis/coracobrachialis (flexion of elbow)Motor deficit3
AxillaryOver deltoidSensory deficit1
RadialPosterior arm/dorsal hand-thumbSensory deficit2
MedianDorsal-palmar lateral 3.5 fingers/thenar eminenceSensory deficit2
UlnarMedial 1.5 fingers/hypothenar eminenceSensory deficit2
MusculocutaneousLateral forearmSensory deficit1
AxillaryAtrophied deltoidSign1
RadialWrist dropSign1
MedianApe hand (loss of opponens pollicis)/Pope's hand (open digits 1-3 when trying to make fist)Sign2
UlnarRadial deviation of wrist upon flexion/claw handSign2
Long thoracicC5-7Nerve Roots3
Long thoracicMastectomyTypical injury1
Long thoracicSerratus anterior (abduction above horizontal)Motor deficit1
Long thoracicWinged scapula/ipsilateral lymphedemaSign2
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Lower Extremity Nerve Injuries

NerveAnswerQuestionNumber
ObturatorL2-L4Nerve Roots3
FemoralL2-L4Nerve Roots3
Common peronealL4-S2Nerve Roots4
TibealL4-S3Nerve Roots5
Superior glutealL4-S1Nerve Roots3
Inferior glutealL5-S2Nerve Roots3
ObturatorAnterior hip dislocationTypical injury1
FemoralPelvic fractureTypical injury1
Common peronealTrauma-compression of lateral aspect of leg/fibula neck fractureTypical injury2
TibealKnee traumaTypical injury1
Superior glutealPosterior hip dislocation/polioTypical injury2
Inferior glutealPosterior hip dislocationTypical injury1
ObturatorThigh adductionMotor deficit1
FemoralThigh flexion/leg extensionMotor deficit2
Common peronealFoot eversion/dorsiflection/toe extensionMotor deficit3
TibealFoot inversion/plantarflexion/toe flexionMotor deficit3
Superior glutealThigh abduction (gluteus medius/minimus)Motor deficit2
Inferior glutealGluteus maximusMotor deficit1
ObturatorMedial thighSensory deficit1
FemoralAnterior thigh/medial legSensory deficit2
Common peronealAnterolateral leg/dorsal footSensory deficit2
TibealSole of footSensory deficit1
Common peronealFoot drop/foot slap/steppage gaitSign3
Superior glutealTrendelenburg (Contralateral hip drops on standing on leg ipsilateral to injury)Sign1
Inferior glutealCant jump/climb stairs/rise from seatedSign3
Sciatic nerveL4-S3Nerve Roots5
Sciatic nervePosterior thighTypical injury1
Sciatic nerveAll of common peroneal/tibialMotor deficit2
Sciatic nerveAll of common peroneal/tibialSensory deficit2
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Brachial plexus lesions

NerveAnswerQuestionNumber
Upper trunkC5-C6Nerve Roots2
Upper trunkDelivery traumaTypical injury1
Upper trunkParalysis of abductors/lateral rotators/bicepsMotor deficit3
Upper trunkErb-Duchenne palsy/Waiter's tip (limb by side/medially rotated/forearm pronated)Sign2
Lower trunkC8-T1Nerve Roots2
Lower trunkThoracic outlet syndrome/pancoast tumor of lungTypical injury2
Lower trunkThenar/hypothenar eminences/interosseousMotor deficit3
Lower trunkMedial forearm/handSensory deficit2
Lower trunkKlumpke's palsy/total claw hand/loss of radial pulse on ipsilateral head rotationSign3
Posterior cordC5-T1Nerve Roots5
Posterior cordFractured midshaft of humerus/compression of axilla by chair-crutchesTypical injury2
Posterior cordBEST/Brachioradialis/Extensors/Supinator/TricepsMotor deficit4
Posterior cordPosterior arm/dorsal hand-thumbSensory deficit2
Posterior cordWrist dropSign1
Long thoracicC5-7Nerve Roots3
Long thoracicMastectomyTypical injury1
Long thoracicSerratus anterior (abduction above horizontal)Motor deficit1
Long thoracicWinged scapula/ipsilateral lymphedemaSign2
AxillaryC5-6Nerve Roots2
AxillaryFractured surgical neck of humerus/dislocation of humeral headTypical injury2
AxillaryDeltoid (arm abduction)Motor deficit1
AxillaryOver deltoidSensory deficit1
AxillaryAtrophied deltoidSign1
Radial nerveC5-T1Nerve Roots5
Radial nerveFractured midshaft of humerus/compression of axilla by chair-crutchesTypical injury2
Radial nerveBEST/Brachioradialis/Extensors/Supinator/TricepsMotor deficit4
Radial nervePosterior arm/dorsal hand-thumbSensory deficit2
Radial nerveSaturday night palsy (wrist drop)Sign1
Musculocutaneous nerveC5-7Nerve Roots3
Musculocutaneous nerveBiceps/brachialis/coracobrachialis (flexion of elbow)Motor deficit3
Musculocutaneous nerveVariableSensory deficit1
Median nerveC5-T1Nerve Roots5
Median nerve-proximalFracture of supracondylar humerusTypical injury1
Median nerve-proximalDecreased thumb opposition/finger flexionMotor deficit2
Median nerve-proximalPope's blessing (upon flexion only 4th/5th digits flex/1-3 remain extended)Sign1
Median nerve-distalCarpal tunnel/dislocated lunateTypical injury2
Median nerve-distalLoss of lateral lumbricles (2-3)Motor deficit1
Median nerve-distalMedian claw (2nd-3rd fingers claw when attempting to extend hand)Sign1
Ulnar nerveC8-T1Nerve Roots2
Ulnar nerve-proximalFracture of epicondyle of humerusTypical injury1
Ulnar nerve-proximalMedial finger flexion/wrist flexionMotor deficit2
Ulnar nerve-proximalMedial 1.5 fingers/hypothenar eminenceSensory deficit2
Ulnar nerve-proximalRadial deviation of wrist upon flexion/claw handSign2
Ulnar nerve-distalFalling onto oustretched handTypical injury1
Ulnar nerve-distalLoss of medial lumbriclesMotor deficit1
Ulnar nerve-distalUlnar claw (4th-5th digits cannot extend when attempting to open hand)Sign1
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Nerve Roots

NerveRoots
AxillaryC5-6
RadialC5-T1
MedianC5-T1
UlnarC8-T1
MusculocutaneousC5-7
ObturatorL2-L4
FemoralL2-L4
Common peronealL4-S2
TibealL4-S3
Superior glutealL4-S1
Inferior glutealL5-S2
Sciatic nerveL4-S3
Upper trunkC5-C6
Long thoracicC5-7
Posterior cordC5-T1
Lower trunkC8-T1
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