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Biomechanics of the Elbow Complex - Coggle Diagram
Biomechanics of
the Elbow Complex
function
Elbow complex provide
Mobility for the hand
Stability for the skilled or forceful
movements of the hand
Musculature of Elbow complex
is linked with wrist or shoulder,
enhances the function of the hand
Osseous structures of the complex
3 bones
Humerus
Radius
Ulna
Components of Elbow complex
Elbow joint
(humeroulnar and humeroradial joints)
Considered a compound joint
(modified hinge joint)
One degree of freedom-Flexion and extension
2 Major ligaments
5 Muscles associated
(3flexors and 2 extensors)
Proximal and distal radioulnar joints
Pivot joint
One degree of freedom
Rotation of the forearm
(supination and pronation)
6 Ligaments
4 Muscles are associated
(2 supinators and 2 pronators)
Articulating surfaces on the Humerus
Humeroulnar joint
Trochlea
Anterior and medial articulation
Trochlea groove
divides the trochlea into medial and lateral portions
Medial portion projects distally and forms the valgus angulation
Coronoid Fossa (anterior)
Receives the coronoid process of the Ulna (flexion)
Olecranon Fossa (Poterior)
Receives olecranon process of the ulna (extension)
Humeroradial joint
Capitulum
Anterior and Lateral Articulation
Radial Fossa (anterior)
Receives the head of the radius (flexion)
Articulating surfaces on the
Radius and Ulna
Humeroulnar joint
Trochlea notch (ulna)
Deep, concave surface
Trochlea Ridge divides the trochlea notch into 2 unequal parts
Corresponds to trochlea groove
Medial portion projects distally and forms the valgus angulation
Coronoid Process (ulna)
Distal end of the trochlea notch
Olecranon process (Ulna)
Proximal end of trochlea notch
Humeroradial joint
Head of Radius
Proximal end
Cup shaped,
Concave fovea
Convex rim
Articulations of Elbow joint
Humeroulnar joint
Sliding motion of ulnar trochlear ridge on the humeral trochlear groove
Extension
Sliding continues until olecranon process enters the olecranon fossa
Flexion
Trochlear ridge of the ulna slides on the trochlear groove until the coronoid process
reaches the coronoid fossa on humerus
Humeroradial joint
Sliding motion of the shallow concave radial head over the convex surface of the capitulum
Slightly incongruent, smaller capitulum compared with the corresponding radial fovea
Extension
No contact between articulating surfaces
Flexion
Rim of the radial head slides in the capitulotracholear
groove and enters the radial fossa as the end of flexion
CRAzy TULips
Capitulum = Radius
Trochlear = ULnar