Elbow/Forearm Flashcards
Elbow Joints
Humeroulnar
Humeroradial
Forearm Joints
Radioulnar
- prox
- middle
- distal
Distal Humerus: Osseous Structures
Capitulum Trochlea Coronoid Fossa Radial Fossa Olecranon Fossa Epicondyles Supracondylar ridge
Proximal Ulna: : Osseous Structures
Trochlear notch Radial notch Coronoid process Ulnar tuberosity Olecranon
Proximal Radius: Osseous Structures
Head
Neck
Radial tuberosity
Elbow joint: joint type, definition
Hinge joint: formed by two articulations
Humerus/ulna: Humeroulnar
Humerus/radial: Humeroradial
*Together they create a single AOR for flexion/extension
Humeroulnar Joint
Synovial joint True hinge joint Articulates w/ trochlea/trochlear notch 1˚ of freedom Flexion/Extension
Trochlea (humerus)
Hour glass-shaped
Prevents side to side movements
Articular surface is distal/medial
Trochlear Notch (Ulna)
Semilunar notch fits around trochlea
Resting Position: Carrying Angle
Angle between longitudinal axes of humerus and ulna
Male: 5-11
Female: 10-16
Humeroradial Joint
Synovial Joint
Condyloid Joint
Articulation of the capitulum w/ head of radius
2˚ of freedom
Elbow flexion/extension (causes abd/add)
Sup/pro of radioulnar joint results in movement at this joint
Elbow ROM
130-150˚ flexion
Limitations: soft tissue, coronoid process (ulna), coronoid fossa (humerus)
0-10˚ hyperextension
Limitations: olecranon process in the fossa, soft tissue stretch anteriorly
Elbow Joint Capsule
Attaches to the humerus, ulna and indirectly to the radius: Annular ligament
Loose anterior/posterior
Taught medial/lateral
Elbow Ligaments
Medial (Ulnar) Collateral Lig. Lateral (Radial) Collateral Lig. Annular Lig.: radioulnar support *All continous w/ joint capsule Function: restrain varus/valgus/distraction
(Ulnar) MCL: O/I
Medial epicondyle Coronoid process/Olecranon 1) Anterior band 2) Posterior band 3) Oblique/transverse band
