Subluxations/Dislocations

Question 1

If the radial head is subluxed or dislocated proximal is this a push or pull?

Answer 1

Push

Question 2

If the radial head is subluxed or dislocated distal is this a push or pull?

Answer 2

Pull

Question 3

What is the mechanism of a proximal/ pushed radial head subluxation/dislocation?

Answer 3

Fall on an outstretched hand (FOOSH)

Question 4

What are complications of a proximal/ pushed radial head subluxation/dislocation?

Answer 4

May also cause a fracture of the distal radius and ulna aka a colles fracture

Question 5

What are the structures involved in a distal/ pulled subluxation/ dislocation?

Answer 5

Radioulnar articulations held together by the annular ligament and interosseous membrane

Question 6

What is the mechanism of injury of a distal/ pulled subluxation/ dislocation?

Answer 6

Forceful traction through the lateral forearm

Question 7

Where does the annular ligament attach?

Answer 7

Anteriorly and posteriorly on the radial notch

Question 8

What does the annular ligament encompass?

Answer 8

Radial head and holds it against the ulna

Question 9

What is the purpose of the interosseous membrane?

Answer 9

• Keeps the radius and ulna together
• Serves as a muscle attachment for forearm and wrist muscles

Question 10

What are complications of humeroulnar subluxations/ dislocations?

Answer 10

• 3 major nerves around the elbow: median, radial, ulnar
• Brachial artery (emergency referral)
• Fractures
• Frequent loss of terminal extension

Question 11

What is your Rx for humeroulnar subluxation/ dislocation?

Answer 11

Like ligamentous sprains for worse hypermobility/ instability