Elbow Flashcards
Articulations in the elbow
Humeroulnar joint
Radiohumeral joint
Proximal radioulnar joint (not strictly involved in elbow flex/ext)
What type of joint is the humeroulnar joint
Uniaxial hinge joint
What is the humeroulnar joint formed by..
the trochlea notch of ulnar and the trochlea of humerus
Surface shape of humeroulnar joint
Saddle shaped
Concave in the sagittal plane
Convex in the frontal
Superior radioulnar joint articular surface
Convex, cyclindrical shaped rim of the radial head
Concavityof the radial notch of the ulnar and annular ligament
What type of joint is the radiohumeral joint
Triaxial ball and socket
What does the radiohumeral joint lie between…
Capitulum of the humerus
Radial head
Movements at the radiohumeral joint
Flexion-extension
Pronation-supination
Name the ligaments in the elbow joint
Ulna collateral
Lateral ular collateral
Radial collateral ligament
Annular ligament
Ulna collateral ligament
Runs on the inner side of the elbow
Connects inside of humerus to the inside fo your ulna and helps stabilse your arm
Elbow flexion
Biceps
Brachialis
Brachioradialis
Biceps brachi
Origin and insertion
Origin- short head - coracoid process
Origin - long head- supraglenoid tubercle and lip of glenoid cavity
Insertion- common tendon into radial tuberosity
Brachialis
Origin and insertion
O - anterior surface of distal humerus; embraces insertion of deltoid muscle
I - coronoid process of ulna and capsule of elbow joint
Brachioradialis
Origin and insertion
O- lateral supracondylar ridge at the distal end of humerus
I - base of radial styloid process
Elbow extension
Triceps brachii
Anconeus
Triceps brachi
Origin and insertion
O (long head)- infraglenoid tubercel of scapula
O (lateral head) - posterior shaft of humerus
O (media head) - posterior humeral shaft distal to radial groove
I - by the common tendon into the olecranon of ulna
Anconeus
Origin and insertion
O - lateral epicondyle of humerus
I - Lateral aspect of olecranon of ulna
Pronator muscles
Pronator teres
Pronator quardatus
Brachioradialis
Pronator teres
Origin and insertion
O - medial epicondyleof humerus; coronoid process of ulna
I - by common tendon into lateral radius midshaft
Pronator quadratus
Origin and insertion
O - distal portion of anterior ulnar shaft
I - distal surface of anterior radius
Supination muscles
Supinator
Biceps brachii
Brachioradialis
Supinator muscle
O - lateral epicondyle of humerus; proximal ulna
I - proximal end of radius
Annular ligament
Stabilises the radial head within the radial notch of the ulnas it rotates during suprination and pronation of the forearm.
Lateral ulnar collateral ligament
Static stabiliser of the elbow joint and as a primary restraint to varus fromace external rotatory stress
Radial collateral ligament
Connects form the humerus to the radius
Stabilse against inner to outer stress
Normal movment ranges - flexion
Males - 145
Females - 150
Normal movmeent ranges - extension
Males- 1
Females - 5
Normal movement ranges- pronation
males - 77
Females - 82
Normal movement ranges-
Supination
males - 85
Females- 91
Conditions of the elbow/forearm
Arthropathy (eg OA, RA, gout)
Traumatic injuries (eg fractures, dislocations)
Tennis elbow
Golfer’s elbow
Ulnar neuritis/entrapment (cubital tunnel syndrome)
Olecranon bursitis
