Ligaments of the Elbow & Wrist Flashcards
1) What are the 3 bands in the Medial Collateral Ligament complex of the elbow called?
2) What main movement do they resist?
1) Anterior, Transverse and Posterior bands
2) Resists excessive valgus forces
(Anterior fibres also restrict extension, and posterior fibres resist flexion)
1) What are the 2 bands of the Lateral Collateral Ligament complex of the elbow called?
2) What main movements do they resist?
1) Radial and Ulna bands
2) Resists excessive varus forces
(Ulna collateral ligament slightly restricts flexion)
1) What are the attachment points of the Annular Ligament?
2) What is its function?
1) Posterior margin of radial notch (of Ulna) to anterior margin of radial notch.
2) Surrounds head of radius holding it in place against radial notch. Helps to control the proximal radio-ulnar joint.
1) What are the attachment points of the Oblique cord?
2) What is its function?
1) Proximal Ulna to Proximal Radius
2) When distracting force (i.e. lifting a suitcase) it pulls on the ulna to load share with the radius. The annular ligament and brachioradialis assist to support the load.
1) What are the attachment points of the Interosseus Membrane?
2) What is its function?
1) Ulna to radius
2) The interosseous membrane divides the forearm into anterior and posterior compartments, serves as a site of attachment for muscles of the forearm, and transfers compressive loads placed on the forearm from the radius to the ulna to be able to load share.
1) What is the name of the 2 ‘short’ intrinsic ligaments of the wrist?
2) What are their function?
1) Short Palmar Ligaments and Short Dorsal Ligaments (of distal row)
2) Connects bones of the distal row of carpals to make them one functional group.
What is the name of the 3 ‘intermediate’ intrinsic ligaments of the wrist?
1) Lunotriquetral Ligament (Lunate to Triquetrum)
2) Scapholunate Ligament (Scaphoid to Lunate) - one on dorsal aspect, one on palmar aspect, and one interosseous in space between.
3) Scaphotrapezial Ligament (Scaphoid to Trapezium) - on dorsal of hand
What are the attachments of the Palmar Intercarpal Ligament (inverted V shape)?
Capitate to Scaphoid, and Capitate to Triquetrum (creating inverted V shape)
What are the attachments of the Dorsal Intercarpal Ligament?
Scaphoid to Triquetrium (runs transversely)
1) What are the attachments of the dorsal radiocarpal ligament?
2) What is its function?
1) Posterior border of distal radius to dorsal surface of scaphoid, lunate and triquetrium
2) Reinforces dorsal of wrist joint capsule. Restricts flexion of the wrist.
1) What are the attachments of the palmar radiocarpal ligament?
2) What is its function?
1) Radial styloid to scaphoid, lunate and capitate (radioscaphocapitate, radiolunate, radioscapholunate bands)
2) Provides palmar support. Restricts extension of the wrist.
1) What are the attachments of the radial collateral ligament?
2) What is its function?
1) Radial styloid to scaphoid, trapezium and transverse carpal ligament
2) Reinforces lateral aspect of wrist joint and capsule. Restricts extension and ulnar deviation.
1) What are the attachments of the ulnar collateral ligament?
2) What is its function?
1) Styloid process of ulna to triquetrum and pisiform
2) Provides support to ulnar side of wrist. Restricts radial deviation and extension.
1) What are the attachments of the palmar ulnocarpal ligament?
2) What is its function?
1) Styloid process of ulna to lunate and triquetrium
2) Provides support to ulnar side of wrist. Restricts radial deviation and extension.
1) What ligaments/components form the Triangular Fibrocartilage Complex (TFCC)?
2) What does this do?
1) Involves the palmar and dorsal radioulnar ligaments, ulnar collateral ligament, palmar ulnocarpal ligament and articular disc.
2) A major contributor to the stability of the wrist, joining the distal ulna to the lunate and triquetrium.
