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NPTE MS > Elbow > Flashcards

Elbow Flashcards

1
Q

Humeroulnar joint - what articulates

A

Distal humerus (trochlea) with proximal end of ulna

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2
Q

Humeroradial joint - what articulates

A

Distal end of humerus (capitulum) with concave facet of radius

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3
Q

Proximal radioulnar joint - what articulates

A

Medial radius with radial notch of ulna

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4
Q

Distal radioulnar joint - what articulates

A

Convex ulna with concave radius

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5
Q

Flexors

A

Biceps
Brachialis
Brachioradialis

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6
Q

Extensors

A

Triceps

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7
Q

Pronators

A

Pronator teres

Pronator quadratus

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8
Q

Supinators

A

Biceps

Supinator

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9
Q

Innervation of biceps

A

Musculocutaneous

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10
Q

Innervation of triceps

A

Radial

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11
Q

Innervation of brachialis

A

musculocutaneous

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12
Q

Innervation of supinator

A

Radial

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13
Q

Innervation of pronators

A

Median

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14
Q

Capsule - continues medially with ___

A

Ulnar collateral ligament

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15
Q

Capsule - continues laterally with ___

A

Radial collateral ligament

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16
Q

Ulnar collateral ligament

A

Three parts

Reinforces humeroulnar joint medially

17
Q

Radial collateral ligament

A

Fan shaped from lateral epicondyle to annular ligament

Reinforces humeroradial joint laterally

18
Q

Annular ligament

A

Osteofibrous ring attached to medial ulna and encircles the radial head
Protects radial head
Taut in extreme pronation and supination

19
Q

Quadrate ligament

A

Radial notch of ulna to the neck of the radius

Reinforces inferior joint capsule

20
Q

Distal radioulnar ligament

A

Ant and Post parts

Both strengthen capsule

21
Q

Bursa

A

Olecranon bursa - located on post aspect elbow over olecranon process

22
Q

Main contributors to elbow bony stability

A

Trochlea of humerus and trochlear fossa of ulna

23
Q

Medial collateral ligament provides resistance to

A

valgus forces

24
Q

Lateral vs. medial collateral ligament

A

Lateral does not have to be as strong
Tensile forces usually placed medially
Compressive forces usually laterally

25
Q

Biomechanics - what does ulna do with flex and ext

A

Ulna pronates slightly with ext

Supinates slightly with flex

26
Q

Biomechanics - during extension, proximal elbow

A

glides medially

27
Q

Biomechanics - during flexion, proximal elbow

A

glides laterally

28
Q

Biomechanics - Flex/Ext of elbow is accompanied by

A

screw home mechanism with conjunct rotation of ulna

29
Q

Biomechanics - screw home mechanism

A 
Ulna ER (supinates) during elbow flexion
Ulna IR (pronates) during elbow extension

NPTE MS (29 decks)

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