ligaments Flashcards
1
Q
trapezoid (coracoclavicular)
A
- attachments
- coracoid process > trapezoid line of clavicle
- functions
- stabilizes acromioclavicular joint limiting medial displacement, protraction, and elevation
2
Q
sternoclavicular
A
- anterior
- posterior – primary stabilizer
- superior
3
Q
conoid (coracoclavicular)
A
- attachments
- coracoid process > conoid tubercle of clavicle
- function
- stabilizes acromioclavicular joint limiting medial displacement, protraction, and elevation
4
Q
acromioclavicular
A
- attachments:
- superior aspect of acromial end of clavicle > adjacent acromion
- function:
- stabilizes acromioclavicular joint
5
Q
coracoacromial
A
- attachments:
- lateral border of coracoid process > adjacent acromion > clavicular articulation
- function:
- prevents superior displacement of the humeral head by forming the coracoacromial arch
6
Q
coracohumeral
A
- attachments:
- base of coracoid process > anterior aspect greater tubercle
- function:
- reinforces superoanterior aspects of joint capsule
7
Q
costoclavicular
A
- attachments:
- superior aspect of cartilage of first rib > undersurface of the clavicle
- function:
- stabilizes sternoclavicular joint, limiting elevation of the clavicle
- taught with elevation and retraction
8
Q
superior transverse scapular
A
- attachments:
- base of coracoid process > medial edge of the scapular notch
- function:
- closes of suprascpaular notch
9
Q
glenoid capsule
A
- attachments:
- circumference of glenoid cavity > anatomical neck of humerus
- capsular tissue: anterior and posterior continues laterally on humerus into neck of humerus
- anterior and inferior capsule much thicker than posterior
10
Q
superior glenohumeral
A
- attachments:
- upper part of medial margin of glenoid cavity > lesser tubercle and anatomical neck
- function:
- stabilizes against inferior translation of humerus on glenoid with humerus at 0 degrees of abduction
- restraint against inferior translation in adducted position
11
Q
middle glenohumeral
A
- attachments:
- upper part of medial margin of glenoid cavity > lesser tubercle and anatomical neck
- function:
- stabilizes against anterior translation of humerus on glenoid
- primary restraint against ER at 45 degrees of abduction/scaption
- courses along anterior joint from glenoid to humerus in superior to inferior direction
12
Q
inferior glenohumeral
A
- attachments:
- upper part of medial margin of glenoid cavity > lesser tubercle and anatomical neck
- function:
- stabilizes against inferior translation of humerus on glenoid with humerus at 90 degrees of abduction
- main static stabilizer of GH joint with arm at 90 degrees of abduction
- anterior band: primary restraint against ER at 90 degrees abduction
- posterior band: against IR
13
Q
ulnar collateral
A
- attachments:
- medial epicondyle > medial margin of coronoid process and olecraon process
- function:
- resists excessive cubital valgus
- provides stability against valgus stress: importent between 20-130 degrees
- triangular shaped
- 3 components
- anterior band (bundle) – oblique to ulna
- posterior band (bundle) – to olecranon process on ulna
- transverse – (oblique) band (bundle)
14
Q
anterior band UCL
A
- strongest and stiffest elbow collateral ligament
- becomes taught in terminal extension
- stabilizes elbow against valgus stress 20-120 degrees
- secondary restraint at end range flexion beyond 120 degrees
15
Q
posterior band UCL
A
- weakest band (fan shaped)
- taut beyond 55 degrees of elbow flexion
- secondary restraint to velgus stress at lesser degree of flexion
- equal co-restraint with anterior band at terminal flexion (especially in overhead athlete in counteracting valgus stresses)
16
Q
transverse (oblique) band UCL
A
- originates and insertes on ulna
- little role in elbow stability
- deepens socket for trochlea
17
Q
radial collateral
A
- attachments:
- lateral epicondyle > annular ligament
- function:
- resists excessive cubital varus
- fan shaped from lateral epicondyle, blends with anular ligament
- consistent tension throughout arc of flexion
- restraint against varus load at elbow
- primary restraint against posterolateral instability of radial head
18
Q
anular
A
- attachments:
- anterior margin of radial notch > posterior margin of radial notch surrounding head of radius
- function:
- stabilizes proximal radioulnar joint
- provides 80% of articular surface of humeral radial joint
- stabilizes radial head
- maintains relationship of radial head with ulna
- forms proximal radioulnar joint
- permits pronation/supination
19
Q
ligaments of the wrist
A
- intrinsic: interosseous, midcarpal
- not as necessary for us
- extrinsic: radiocarpal, ulnocarpal
- resist flexion/extension, radial/ulnar deviation
20
Q
interosseous membrane of forearm
A
- attachments:
- interosseous border of radius > interosseous border of ulna
21
Q
transverse carpal
A
- attachments:
- pisiform and hook of hamate > scaphoid and trapezium
- function:
- prevents bowstringing of the tendons of flexor pollicis longus, flexor digitorum superficialis, flexor digitorum profundus
22
Q
radiocarpal
A
- attachments:
- dorsal and palmar surface of distal radius > first two rows of carpal bones
- function:
- stabilizes carpal bones on the radius
23
Q
radial collateral ligament of wrist
A
- attachments:
- radial styloid process > scaphoid
- function:
- restrain/limit wrist ulnar deviation