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Move Sci > Elbow Test 2 > Flashcards

Elbow Test 2 Flashcards

1
Q

What plane and axis does the elbow joint move in?

A

saggital plane

coronal/frontal axis

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2
Q

Radial fossa receives head of radius in full elbow ______

A

flexion

Note: olecranon fossa receives olecranon process in full ext

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3
Q

Coronoid fossa: receives coronoid process of ulna at end of elbow _____

A

flexion

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4
Q

The trochlea is between the….

whereas the capitulum is between the….

A

trochlea- humerus + ulna

capitulum- humerus + radius

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5
Q

True or false: in full ext there is no contact between the radial head and capitulum

A

true

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6
Q

How would you describe the elbow joint capsule?

A

Large and loose/weak

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7
Q

The Triangular synovial of the elbow’s joint capsule is found between…

A

The humerus and the radius

hypertrophy of this fold can cause lateral epicondylalgia

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8
Q

What is considered the primary restraint to valgus stress between 20-120 degrees of flexion

A

anterior bundle of UCL/MCL

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9
Q

What does the posterior bundle of the UCL/MCL do?

A

Limits elbow EXT, less restraint to valgus stability

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10
Q

What is the secondary restraint to varus stress/supination stress at the elbow?

A

Lateral ulnar collateral ligament + annular ligament

Note: there is also a radial collateral ligament which provides some resistance to varus stress

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11
Q

at 90 degrees flexion Resistance to varus stress mostly ______, but some from LCL and capsule

A

osseus

Note: resistance to VALGUS stress in this position is from anterior part of UCL

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12
Q

In full elbow extension, what is stabilizing against varus stress?

A

50% from bone, 50% from LCL and capsule of varus stress

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13
Q

in full elbow flexion what is stabilizing the elbow?

A

Full FLX: coronoid process with fossa and rim of radial head

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14
Q

What is the mobility muscle of the elbow?

A

Biceps + Brachialis

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15
Q

What is the stability muscle of the elbow?

A

Brachioradialis

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16
Q

What amount of flexion is the brachioradialis’ movement arm the largest?

A

Between 100-120

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17
Q

Where is the brachialis movement arm the largest

A

More than 100 degrees flexion

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18
Q

Where is the biceps brachii movement arm the largest?

A

Moment arm greatest at 80-100 deg of elbow FLX

note:Most active during elbow FLX with forearm SUP

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19
Q

Triceps Brachii: Active insufficiency with elbow EXT when shoulder is ________

A

hyperextended

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20
Q

What ligament limits the spin of the radial head?

A

Quadrate ligament

note:also it helps keep radial head in radial notch

21
Q

what ligament may assist in preventing separation of radius and ulna

A

oblique cord

22
Q

what ligament runs at a perpendicular angle to the interosseus ligament

A

oblique cord

23
Q

what ligament encircles the radial head?

A

annular ligament

24
Q

TFCC and _______ capsule can also provide stability,
_______ capsule can limit ROM after injury & scar tissue build up

A

DRUJ

DRUJ

25
Q

what stabilizes both PRUJ and DRUJ?

A

interosseus ligament

26
Q

What ligaments extend along the margins of the TFCC and go into the ulnar fovea and ulnar styloid

A

palmar and dorsal ligaments

27
Q

Pronator teres is a _____ joint muscle

A

two

note: it also stabilizes PRUJ

28
Q

Pronator quadratus stabilizes what joint?

A

DRUJ

29
Q

Pronator teres does pronation and helps with…

A

elbow flexion

30
Q

supination torque is greatest where?

A

with arm in full pronation

viceversa for the pronator’s torque

31
Q

what is limited by bone on bone contact, pronation or supination?

A

pronation

Dorsal radioulnar lig & posterior fibers of MCL

32
Q

During pronation, which bone rotates around the other?

A

Radius rotates around ulna

33
Q

what is the full ROM for pronation/supination and where is it measured?

A

150 total

measured with elbow flexion to remove shoulder IR/ER

34
Q

brachioradialis may act as a _______ in full supination and a _____ in full pronation

A

pronator

supinator

35
Q

supinator has the most torque at….

A

75% pronation (not full)

note: only does unresisted supination, bicep kicks in if it is resisted

36
Q

How does the TFCC contribute to radioulnar stability?

A

transmits compression and tension forces; stabilizes carpals

37
Q

Dorsal radioulnar lig: taut in ________

A

pronation

38
Q

Palmar radioulnar lig: taut in _________

A

supination

39
Q

Forearm stabilized by ____________ in PRO/SUP and gripping activities

A

ECRB

note: Muscular support of DRUJ from pronator quadratus and extensor carpi ulnaris tendon

40
Q

the dorsal and palmar ligaments allow for how much joint play?

A

5mm

41
Q

what is the purpose of the interosseus ligament?

A

force transmission

in weight-bearing:
Greater GRF through radial head due to size

Interosseous becomes taut

Force is transferred from radial head to head of ulna (proximal forearm)

42
Q

What is the functional requirement for most activities of elbow flexion and forearm supination

A

30-130 ext/flexion

50 of each supination and pronation

43
Q

When mobilizing PRUJ or DRUJ, what do you need to be aware of?

A

Cascading consequences of what can happen at the other joint

44
Q

What ossifies first at the elbow?

what ossifies last?

A

Capitulum first

45
Q

A FOOSH will most likely result in a fracture where?

What gets displaced?

A

Fracture of proximal ulna (because it’s the smaller bone)

and an anterior dislocation of radial head

46
Q

What happens in nurse maids elbow/distraction injury

A

radial is pulled inferiorly out of annular ligament

47
Q

repetitive contractions of ______ may compress ulnar nerve

A

flexor carpi ulnaris

48
Q

____________ instability causes increased carrying angle and radial head compression on capitulum (ex. Throwing) – can lead to avascular necrosis of capitulum

A

Ulnar collateral ligament

note: elbow is the region of the body with the highest incidence of peripheral neuropathy

Move Sci (4 decks)

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