Elbow BM Flashcards
Elbow and forearm function
- Move the hand
- Position the hand for activities
- The proximal upper body joints are subservient to the hand
Humero-ulnar joint
Hinge joint
**flex/ext
Small amounts of ab/add
Three joints in the elbow
Humero-ulnar
Humero-radial
Proximal radio-ulnar
Cubitus valgus
Carrying angle
Inclination slightly from medial to lateral
Ligaments in elbow complex
Medial collateral
Lateral collateral
Annular
Ligaments in elbow complex
Medial collateral
Lateral collateral
Annular
Medial collateral lig
Anterior- tight throughout ROM
Posterior- tight in extreme flex
Transverse- minimal stability
*resists valgus F
Lateral collateral lig
Radial collateral- ……
Ulnar collateral- tight with full flex
Resists varus F
Humero-ulnar joint arthrokinematics
concave ulna moving on convex humerus
Flexion: sup roll & sup glide
Humero-ulnar J osteokinematics
Flexion
*extension rare, but hyperextension is possible
Humero-radial J
Capitulum of humerus on fovea of radius
2 angular DOF for humeri-radial J
Flex/ext
Pronation/supination
Arthrokinematics of humero-radial J
Flexion: sup roll & inf glide
Proximal radio-ulnar J location
Radial head in radial notch
osteokinematics of proximal radioulnar J
Pronation/supination
Arthrokinematics of proximal radioulnar J
Spin
Annular ligament
Prevents subluxation of radial head
Elbow flexors
Biceps brachii
Brachialis
Brachioradialis
Elbow extensors
Triceps, anconeus
Primary pronators
Pronator teres
Pronator quadratus
Secondary pronators
FCR
Primary supinators
Biceps brachii
Supinator
Secondary supinators
EP & EI
