Elbow and Hand Flashcards
Ulnar collateral Ligament
function- resists excessive cubital valgus
attachments- from medial epicondyle to medial margin of coronoid process & olecranon process
Three distinct bands: anterior (strongest), posterior, transverse (runs along the ulna to deepen trochlea)
Radial collateral ligament
function- resists excessive cubital varus
attachments- from lateral epicondyle to annular ligament
Annular ligament
function- stabilizes proximal radioulnar joint
attachments- from the anterior margin of the radial notch to posterior margin of radial notch surrounding head of radius
Interosseous Membrane
attachments- from interosseous border of radius to interosseous border of ulna
Transverse Carpal ligament
function- prevents bowstringing of the tendons of the flexor pollicis longus, flexor digitorum superficialis & flexor digitorum profundus muscles
attachments- from the pisiform & hook of the hamate to scaphoid & trapezium
Collateral Ligaments of the metacarpophalangeal joints
function- stabilizes metacarpophalangeal joints
attachments- from the head of the metacarpals to base of adjacent proximal phalanx
TFCC (Triangular fibrocartilage complex)
Function- Stabilize distal radio-ulnar and ulnocarpal joints, form concavity on the ulnar side of the wrist AND transfer compressive force from hand/wrist to the forearm.
Components- Biconcave fibrocartilage disc, Palmar ulnocarpal ligament, Ulnar collateral ligament
Humeral Ulnar joint type and direction of distal movement
Hinge joint: ulna rolls and glides in the same direction
Humeral Radial joint type and direction of distal mvmt
Modified hinge joint: radius rolls and glides in the same direction on humerus
DRUJ
Ovoid joint CONCAVE radius glides on convex ulna
Injuries to TFCC
Disc injury from compression and sheer
OR ligamentous attachment injury from distraction force or extreme radial deviation (ulnar coll lig or palmar ulnocarpal lig)
1st CMC joint type and motions
Sellar joint: 1st metacarpal on trapezium
Radial add/abd glide in same direction
Palmar add/abd glide in opposite direction
1st MCP joint type and motions
Condyloid joint, acts like a hinge joint, concave on convex
Transverse metacarpal ligaments
Deep: connects met heads.
Superficial: connects adjacent volar plates
MCP 2-5
ovoid, 3 degrees of freedom. Base of phalanges is concave sitting on convex, glide in same direction as movement
IP joints
Synovial hinge joints, considered concave on convex
