Nerve Issues II: Forearm Nerves

Nerve Issues II: Forearm Nerves

1. Radial Nerve

   • Injury in Arm
     • Caused by Humeral Shaft Fracture
     • Keep Elbow Extension
   • Injury at Cubital Fossa
     • Hypertrophy--> Supinator Entrapment
     • Radius Neck Fracture
     • No Wrist Drop
   • Posterior Cord
     • Extensor Paralysis/Wrist Drop
     • Flexion at all joints
     • Axillary Nerve Loss/ Deltoid Paralysis
     • From Radial Nerve Compression

2. Median Nerve

   • Injury at Wrist or in Palm
     • Thenar Paralysis
       • Thenar Eminence atrophy
     • Weakened flexion at 1st MCP
     • caused by carpal tunnel syndrome:Tinsel Test
     • 1st and 2nd lumbrical paralysis
       • impaired movement of digits 2-3
     • Sensory Loss: Lateral Palm/ 3.5 digits
   • Injury at Elbow
     • No Pronation
     • Weakened Wrist Flexion/Abduction
     • Benediction Hand
       • Finger 3 curls down when finger 4-5 flex
     • Pronator Teres Entrapment
     • Anterior Interosseous Branch
       • No IP flexion of thumb
       • No DIP flexion of fingers 2-3
       • weakened pronation and no "OK" sign

3. Ulnar Nerve

   • Injury at Wrist
     • Intrinsic Hand Muscle Paralysis except 1/2LOAF
     • No Abduction/Adduction of fingers
     • No Adduction of Thumb
     • No simultaneous flexion of MCP and extension of IP (2-5)
     • Causes Clawhand
       • Look up on PPT: too complicated
   • Injury at Elbow
     • Impairs wrist flexion and ulnar deviation
     • 1/2 of FDP Lost