Flashcards in 5. Wrist bones Deck (25)
Wrist bones - names
Wrist bones - 1st series ( lateral to medial )
Wrist bones - 2nd series ( lateral to medial )
radius is attached to ( wrist)
scaphoid and lunate
scaphoid is palpated in ( area)
anatomic snuff box
most commonly fractured of the carpal bone ( typically how)
scaphoid - typically from a fall on an outstreched hand
scaphoid fracture is prone to ( why )
avascular necrosis owing to retrograde blood suppy
dislocation of lunate may cause
acute carpal tunnel syndrome
a fall on an outstretched hand that damages the hook of the hamate can cause
ulnar nerve injury
Carpal tunnel syndrome - nerve ?
Carpal tunnel syndrome - mechanism
entrapment of median nerve in carpal tunnel ---> nerve compression
Carpal tunnel syndrome - symptoms
3 numbness (in distribution of median nerve)
Carpal tunnel syndrome is associated with
4. repetitive use
5. dislocation of lunate ( acute Carpal tunnel syndrome)
7. dialysis related amyloidosis
Guyon canal syndrome ?
compression of ulnar nerve at wrist or hand
Guyon canal syndrome is classically seen in (why)
cyclists due to pressure from handlebars
Carpal tunnel syndrome
- sensation spared, because palmar cutaneous branches enters the hand extrernal to carpal tunel
ACL - anatomy
extends from lateral femoral condyle to anterior tibia
PCL - anatomy
extends from medial femoral condyle to posterior tibia
• Name the carpal bones of the wrist (this does not include related bones of the radius and ulna).
Scaphoid, Lunate, Triquetrum, Pisiform, Hamate, Capitate, Trapezoid, Trapezium (So Long To Pinky, Here Comes The Thumb)
• Which carpal bone is most prone to avascular necrosis? Why?
Scaphoid; because of retrograde blood supply
• A man slips and hurts his wrist. His lateral palm is later noted to have diminished sensation. Which nerve was likely injured?
The median nerve (due to dislocation of the lunate), causing an acute carpal tunnel syndrome
• A pianist complains of pain and occasional numbness in his thumbs and index fingers, a problem likely caused by what?
Carpal tunnel syndrome (entrapment of the median nerve in the carpal tunnel)
• A bicyclist complains of paresthesias and decreased pinch strength in his pinky. What syndrome do you suspect?
Guyon canal syndrome, causing ulnar nerve injury
• Name some conditions that can predispose a patient to carpal tunnel syndrome.
Pregnancy, rheumatoid arthritis, hypothyroidism, repetitive use