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===[[Peripheral nerve syndromes]]===
*'''Upper extremity'''
**'''Ulnar'''
***Cause of Injury: [[Elbow diagnoses | Elbow]] injury.
***Sensory changes in the 5th and medial half of 4th digits, weak wrist flexors,  “claw hand” 
**'''Radial'''
***Cause of Injury: Distal humeral shaft fracture, anterior shoulder dislocation, supra-condylar fracture, [[Radial neuropathy at the spiral groove]], [[Posterior interosseous neuropathy]]
***“Wrist drop,” weakness of finger extensors. +/- sensory loss over the dorsum of the hand, weak thumb adduction
**'''Median, distal'''
***Cause of Injury: Wrist dislocation, laceration, [[Median Mononeuropathy (Carpal Tunnel Syndrome)|Carpal Tunnel Syndrome]]
***Weak flexion of radial half of digits and thumb, loss of abduction and opposition of thumb. Ape hand deformity, benediction sign. Loss of sensation of lateral three and one-half digits and nail beds
**'''Median, proximal'''
***Cause of Injury:  Supracondylar humeral fracture, [[Pronator teres syndrome]], [[Anterior interosseous neuropathy]], tight cast
***See Median, distal above, loss of forearm pronation, loss of radial half digits and thumb flexion
**'''Musculocutaneous'''
***Cause of Injury: [[Anterior shoulder dislocation]], entrapment due to hypertrophy
***Elbow flexion and supination weakness, radial forearm sensory deficits
**'''Axillary'''
***Cause of Injury: [[Anterior shoulder dislocation]], [[inferior shoulder dislocation]], [[proximal humerus fracture]]
***Weak arm abduction (from 15 to 90 degrees), weak shoulder flexion, extension and rotation of shoulder, loss of sensation of upper lateral arm
**'''Suprascapular'''
***Cause of Injury: Paralabral cyst, bone/soft tissue tumor, [[Scapular fracture]], traction injury, [[Parsonage-Turner syndrome]]
***Weak arm abduction to 90 degrees, weak shoulder flexion to 30 degrees, weak internal rotation
*'''Lower extremity'''
**'''Femoral'''
***Cause of Injury: Pubic rami fracture, [[pelvic fractures]]
***Weak knee extension, anterior knee sensory deficits
**'''Obturator'''
***Cause of Injury:  Obturator ring fracture, [[obturator nerve entrapment]]
***Weak hip adduction, medial thigh sensory deficit
**'''Posterior tibial'''
***Cause of Injury:  [[Knee dislocation]]
***Weak toe flexion, plantar foot sensory deficit
**'''Superficial peroneal'''
***Cause of Injury:  Fibular neck fracture, [[knee dislocation]]
***Weak ankle eversion, lateral dorsal foot sensory deficits
**'''Deep peroneal'''
***Cause of Injury:  Fibular neck fracture, [[compartment syndrome]]
***Sensory deficit at dorsal 1st web space, weak ankle and toe dorsiflexion
**'''Sciatic'''
***Cause of Injury:  Posterior [[hip dislocation]] 
***Lower leg weakness, foot drop, leg sensory deficits
**'''Superior gluteal'''
***Cause of Injury: [[Acetabular pelvic fracture]]
***Trendelenburg’s gait, Trendelenburg’s sign
**'''Inferior gluteal'''
***Cause of Injury: [[Acetabular pelvic fracture]], s/p hip replacement
***Abnormal gait, gluteus maximus weakness resulting in gluteus maximus lurch