Flashcards in MSK Session 5 (Lecuture 5.1) Deck (21):
Which muscles produce the hinge movement of the elbow?
1) Biceps brachi
2) Triceps brachi
What strengthens the elbow medially and laterally?
Radial and ulnar collateral ligaments
What does the synovial membrane line in the elbow?
Fibrous capsule and humerus
What are the three bands of the ulnar collateral ligament? Where do they join?
1) Anterior cord - medial epicondyle of humerus to coronoid porcess and olecranon of ulna
2) Posterior cord - "
3) Oblique cord - "
What is the structure of radial collateral ligament? What does it blend with?
Blends with annular ligament
What are the two most important bursae in the elbow?
Subcutaneous olecranon bursa
Subtendinous olecranon bursa
What does the radial nerve pass anteriorly to at the elbow?
What does the ulna nerve pass posterior to in the elbow?
What does the head of the radius pivot around to allow pronation?
What is the function of the annular ligament? What is its shape?
Holds head of radius in place to articulate with the capitulum. It is a ligamentous collar.
How does a pulled elbow occur? Whom is it commonly seen in?
Seen in children.
Pulling force causes radial head to subluxate from annular ligament. Causes radius to be dislocated and pulled superiorly causing a lump.
Caused by stretchy annular ligament.
What is the difference between a dislocation and subluxation?
Dislocation - complete loss of contact of the joint surfaces
Subluxation - partial dislocation of a joint so that the bone ends are misaligned but there is still some contact
What is the interosseous membrane? How do its fibres run? What does it allow?
1) Fibrous joint between radius and ulna
2) Run infero-medially
3) Allows distribution of force from radius to ulna
What does the ligamentous articular disc do?
Main stucture affording joint integrity at the distal radioulnar joint. Separates cavity of distal radioulnar joint from wrist cavity.
What allows twisting of the articular disc?
Sacciform recesswhich is a superior extension of synovial capsule
Which carpal bone is not part of the radiocarpal joint?
What are the two ligaments found within the hand?
1) Palmar radiocarpal (ensures hand follows radius during supination)
2) Dorsal radiocarpal (ensures hand follows radius during pronation)
What is limited by the radial styloid porcess?
Abduction of wrist
What is a colles fracture?
Fracture due to falling onto outstreched hands. Causes posterior displacement of distal fragment of radius
How can the scaphoid be fractured?
Fall onto out-stretched hand causing tenderness over anatomical snuffbox. Avascular necrosis possible sequela