04 Wrist

Bones

Scaphoid

• palmar and dorsal branches supply scaphoid

• blood to distal/lateral first then proximal/medial

• avascular necrosis to proximal portion

• waist of scaphoid fracture

• result in nonunion

Lunate

• B

• sits on top and attaches to radius

• rest of bones fall backward. Lunate attached and falls forward

• if displaced anteriorly in dislocation can compress carpal tunnel

Carpel Tunnel

• carpel: wrist bone

• tunnel: median nerve inside, between flexor retinaculum and bones

• pic: everything in yellow

• small branch of median come off before carpel tunnel and provides sensory innervation over thenar

• carpel tunnel: sensory loss of lateral fingers but not thenar

• association with carpel tunnel

Guyon's Canal

• how ulnar gets into hand, can be compressed

• above transverse ligament and not below

• use screwdriver often

Pediatric

• children have softer bones

• bone doesn't completely snap in two

Greenstick

• part of bone still attached medially

Torus