Forearm and hand bones/joints Flashcards
Articulating surface: Concave surface of radial head and capitulum of humerus
Radiohumeral joint
Articulating surface: trochlear notch of ulna and trochlea of humerus
Ulnohumeral joint
Radial/Ulnar humeral joint classification
uniaxial hinge, synovial joint
Radial/Ulnar humeral Movements permitted/ plane
Flexion/Extension
Med/Lat axis, Sagittal plane
Radial/Ulnar humeral Capsule
Weak anteriorly/posteriorly
Strengthened med/lat by “collateral ligaments”
medial / Ulnar collateral
triangular shaped, anterior, posterior, oblique bands
limits “vagus” motion (inward)
lat / Radial collateral
fan shaped
limits “varus” motion (outward)
articulating surface: edge of radial head, 1/5 articulates w ulna at any time
Proximal radioulnar joint
Proximal radioulnar joint classification
uniaxial, pivot
synovial joint
Proximal radioulnar joint movements permitted
axis/plane
Supination/pronation
Mechanical axis of radius (no plane)
Proximal radioulnar joint Capsule
Continuous w capsule of radio/ulno humeral joints
Annular ligament
encircles the radial head and ensures correct radial alignment with respect to the humerus and
ulna
Oblique cord
attaches ulna and radius anteriorly
limits / restricts- supination and inferior radial displacement
Olecranon Bursae
Subtendinous: Between olecranon of ulna and triceps tendon
Subcutaneous: between post aspect of olecranon and superficial fascia
Fat pads
outside synovial membrane, but inside capsule
offers cushion/protection