Blue Boxes: Upper Extremity Flashcards Preview

Year 1: 03. MSK Exam 1 > Blue Boxes: Upper Extremity > Flashcards

Flashcards in Blue Boxes: Upper Extremity Deck (62)
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What are Greenstick fractures?

Clavicle fractures in children are most often what type of fracture?

Clavicle fractures in children

One of the most frequently fractures bones


What happens if the fusion of the two ossification centers of the clavicle fail to occur?

Bony defect forms between the lateral and medial thirds of the clavicle

Awareness of this possible congenital defect should prevent diagnosis of a fracture in an otherwise normal clavicle


What should you be concerned about with scapular fractures?

Protruding subcutaneous acromion

Scapular Fractures are rare (result of severe trauma) and require little treatment due to the muscles that surround it


What is the most common site of fracture on the humerus?

Surgical neck

Greater tubercle is also susceptible to avulsion by the supraspinatus, infraspinatus, and teres minor muscles that insert there


What nerves correspond to these sites of the humerus?

Surgical Neck

Radial Groove

Distal end of the humerus

Medial Epicondyle

Surgical Neck: Axillary Nerve

Radial Groove: Radial Nerve

Distal end of the humerus: Median Nerve

Medial Epicondyle: Ulnar Nerve


What can cause a glenoid labrum tear?

Injuries to tissue rim surrounding shoulder socket from acute trauma or repetitive shoulder motion 

  • Falling on an outstretched arm
  • A direct blow to the shoulder
  • A sudden pull, such as when trying to lift a heavy object
  • A violent overhead reach, such as when trying to stop a fall or slide



What nerve is compressed when you hit your "funny bone"? Where is it located?

Ulnar Nerve at the groove for the Ulnar N.


What can cause an avulsion (pulling away) of medial humeral epicondyle?

Severe abduction of extended elbow


Which bone is fractured in a fractured elbow?

Olecranon: Usually avulsion fracture and difficult to repair

Normally caused by falling



What is Colle's Fracture

Fracture at the distal end of the radius

Can be accompanied with evulsion of ulnar styloid process

Most common in adults over 50 and those with osteoporosis



What is the most commonly fractured carpal bone?


Results from a fall on the palm when the hand is abducted



What can cause a fracture of the Hamate?

What nerve can be potentially injured?

Traction produced by attached hypothenar muscles can cause the fractured bony parts to join together


Ulnar Nerve close tho hamate


What is typically injured in a Boxer's Fracture?

Fracture of the 5th metacarpal


What is unique about fractures of distal phalanges?

Can be bad due to intricate relationship between phalanges and flexor tendons bone fragments

Need to be realigned carefully to maintain function


What is agenesis?

Failure of body part or organ to form, usually due to a lack of genetic signaling to produce primordial tissue and failure of subsequent development in the embryo


What is Poland Syndrome?

Agenesis of the Pectoralis Major and Pectoralis Minor

-can also see breast hypoplasia nad absence of 2-4 rib segments


What happens if the Serratus Anterior Muscle or Long Thoracic Nerve is injured?

Winging of the Scapula 

-Upper limb will not elevate normally above the horizontal position

-Serratus anterior is unable to upwardly rotate the scapula to position the glenoid cavity superiorly to allow complete abduction or elevation of the limb


What is the Triangleo f Auscultation? 

Gap in the back musculature to examine lungs


1. Superior horizontal border of the latissimus dorsi

2. Medial border of the scapula

3. Inferolateral border of the trapezius form a triangle of auscultation 


What happens if there is a Spinal Accessory Nerve Injury?

"Dropped” shoulder with a marked ipsilateral weakness when the shoulders are elevated (shrugged) against resistance


Weakness in Trapezius Muscle


How can the Thoracodorsal Nerve be injured?

What can happen if it is injured?

Surgery in inferior part of axialla puts the nerve at risk

-also vulnerable during mastectomies 

Clinical Manifestations: Unable to raise trunk wiht upper limbs (can't climb)


What happens if Dorsal Scapular Nerve is injured?

Rhomboid and Levator Scapulae Muscles affected

-If rhomboids on one side are paralyzed, the scapula on the affected side is located farther from the midline than that on the normal side


What happens if Axillary Nerve is injured?

How can this happen?

Atrophy to Deltoids and Teres Minor Muscles

-Shoulder: flattened appearance and produces a slight hollow inferior to the acromion.

-Loss of sensation may occur over the lateral side of the proximal part of the arm (via superior lateral cutaneous nerve)


1. Injury to surgical neck of humerus

2. Anterior dislocation of glenohumeral joint

3. Compression from incorrect use of crutches


What happens if there is a fracture or dislocation of Proximal Humeral Epiphysis?

 Cause: Direct blow or indirect injury of the shoulder in children/adolescents

-Joint capsule of the glenohumeral joint is reinforced by rotator cuff and is stronger than the epiphysial plate

-Severe fractures: shaft of the humerus is markedly displaced, but the humeral head retains its normal relationship with the glenoid cavity of the scapula


What happens in rotator cuff injuries?

Instability of Glenohumeral Joint

Trauma can tear or rupture one or more tendons (most commonly Supraspinatus Muscle) 


Where are the three scapular anastomoses?

If you want to cut off blood supply to the Upper Extremity, where can place ligatures? 

1. B/t Suprascapular and Circumflex Scapular Arteries

2. B/t Circumflex Scapular and Dorsal Scapular Arteries

3. B/t Thoracodorsal and Dorsal Scapular Arteries


Before Thyrocervical Trunk or After Subscapular Arteries


What are some injuries that can happen to the Axillary Artery?

Compression: Happens in third part of the axillary artery against humerus (normally to stop profuse bleeding)

Aneurysm: Happens in first part of the axillary artery and can compress brachial plexus, causing pain or loss of sensation

Can occur in football or baseball players due to their arm movements

Other Injuries: Proximal wound can cause profuse bleeding or air emboli in blood


How does the axillary vein play a role in the Subclavian Vein Puncture?

Axillary vein becomes subclavian vein when it passes the first rib so the puncture happens in the terminal part of axillary vein


When there is an infection of the lymph nodes, which lymph nodes are normally first invovled?

Axillary Nodes: humeral group of nodes


During an axillary lymph node dissection, what two nerves are at risk of injury?

1. Long Thoracic Nerve

2. Thoracodorsal Nerve 


What are some injuries of the Brachial Plexus?

1. Erb-Duchenne Palsy: Injury to superior parts of brachial plexus

2. Brachial Plexus Neuropathy: Severe pain around shoulder

3. Klumpke Paralysis: Injury to inferior parts of brachial plexus