Radioulnar joints Flashcards
What movements do the radioulnar joints facilitate
Pronation and supination
Head of radius pivots on capitulum of humerus
Articulation of proximal RUJ
Head of radius and radial notch of ulna
Articulation of distal RUJ
Ulnar notch of radius and ulnar head
What holds the radial head in place
Annular radial ligament - forms a collar around the proximal RUJ
What is pulled elbow
Head of radius sublaxates from the annular radial ligament
Where is the interosseous membrane
Spans between the medial radial border and the lateral ulnar border
Functions of the interosseous membrane
Holds radius and ulna together during pronation/supination,
Site of attachment for muscles,
Transfers forces from radius to ulna
What strengthens the distal RUJ
Anterior ligament,
Posterior ligament,
Articular disk (mainly)
Functions of distal RUJ
Binds radius and ulna together,
Separates the distal RUJ from the wrist,
Allows pronation/supination - ulnar notch slides anteriorly over ulnar head
What’s the sacciform recess
Superior extension of synovial capsule that allows twisting of capsule during pronation/supination
What are the radioulnar joints
Proximal radioulnar,
Interosseous membrane,
Distal radioulnar
What encloses the PRUJ
Articular capsule of elbow joint
What is the annular radial ligament lined with
Synovial membrane to reduce friction
What’s the difference between subluxation and dislocation
Sublaxation - bones misaligned but still in contact
Dislocation - complete loss of contact of articulating surfaces
What are the small holes for in the interosseus membrane
Passage of forearm vasculature
