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becky: MSK UQ > LECTURE 11A: ELBOW ANATOMY > Flashcards

LECTURE 11A: ELBOW ANATOMY Flashcards

1
Q

what are the 3 elbow complex joints?

A
  1. humero-ulnar
  2. humero-radial
  3. proximal radio-ulnar
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2
Q

humero-ulnar articulation
1. what is the medial side?
2. what is posterior articulation?

A

medial side: medial lip of trochlea and trochlear notch of ulna
olecranon: posterior articulation of humero-ulnar joint

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3
Q

Humero-radial articulation:
what is the lateral side?

A

lateral side: concave radial head, convex capitulum (humerus)

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4
Q

All three elbow joints share a ____

A

capsule! They are under one house

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5
Q

T or F: The humero-ulnar joint (the big one) is very stable

A

T, very stable! lots of bony congruency unlike the shoulder

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6
Q

At the humero-radial articulation, the radial head resists _____ stress at elbow

A

VALGUS stress (bc it is concave)

also ligaments to help out!

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7
Q

Proximal radio-ulnar joint is made of ____, ____, and _____

A

radial head, annular ligament ring, radial fossa of ulna

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8
Q

The proximal radio-ulnar articulation is held together by

A

interosseous membrane

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9
Q

what joint does mainly pronation and supination?

A

Proximal Radio-ulnar articulation

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10
Q

optimal motion consists of:
___ pronation
___ supination

A

70° pronation & 80° of supination

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11
Q

functionally, what ROM is needed at elbow?

A

30 degrees of extension, 130 degrees of flexion

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12
Q

Does the elbow heal well?

A

Yeah! good blood flow

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13
Q

Is the elbow good at compensating?

A

No! Since it is really strong and stable, it will not compensate/adjust well.
Tiny bad things can cause a lot of problems (small osteophyte = big problem)

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14
Q

Is the elbow prone to overuse injury?

A

HECK YEAH

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15
Q

capsular pattern of humero-ulnar joint

A

flex loss > ext loss

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16
Q

closed packed position of humero-ulnar joint

A

full ext, full forearm supination

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17
Q

The medial side is longer than the lateral side of the elbow. Why?

A

longer

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18
Q

Why do females have a larger carrying angle?

A

more lax = more hyperextension
medial ulna travels laterally during extension

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19
Q

open packed position of humero-ulnar joint

A

70° flex, 10° forearm supination

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20
Q

humero-radial joint is what type of joint and has what motions?

A

Uniaxial hinge joint (2 DOF)
Flex/ext
Spin

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21
Q

CPP of humeral radial joint

A

90° flex, 5° forearm supination

22
Q

OPP position of humero radial joint

A

full ext, full forearm supination

23
Q

capsular pattern of humero-radial joint

A

No real capsular pattern
Clinically, pronation loss = supination loss

24
Q

proximal radio-ulnar joint: will you lose ROM when this is the issue?

A

not really, it is the end range pain

25
proximal radial-ulnar joint
26
greatest extensiblity and mob position of the elbow joint capsule
b/t 70-90° flex
27
If you injure the elbow, how easy is it to regain motion?
NOT THAT EASY: does not respond well to injury forms thick scar tissue = contractures due to less motion/WB
28
medial ligament complex/UCL is the primary restrain to ____
valgus stress at elbow (the most common way to go is valgus in injury)
29
What part of the UCL gets hurt the most?
anterior: strongest and stiffest
30
radial-collateral ligament = lateral collateral ligament (LCL) is primary restraint to _____ at elbow
postero-lateral instability at elbow | fork, attaches to both radius and ulna
31
LCL is taut in ____
full supination *provides some varus stabiltiy
32
What are 2 distinct components of the lateral ligament complex?
Radial collateral ligament Lateral (ulnar) collateral ligament | less discrete, kinda look like capsule thickeniings
33
annular ligament does what?
very strong loop around radial head! maintains proximal radial-ulnar joint relationship *not likely to tear, more likely to pop out under | Internal circumference lined w/ cartilage to ↓ friction
34
main WB joint of the wrist? of the elbow?
wrist: radial-carpal elbow: humero-ulnar *interosseous membrane assists in force transfer from radius to ulna
35
interosseous membrane fibers are directed away from teh radius in a _______ direction
oblique medial direction
36
The interosseous membrane is also called ________ , a collagen sheet that binds radius and ulna together
radioulnar syndesmosis
37
____ provides attachment sites for deep muscles of forearm
interosseous membrane
38
flexor pronator strain in baseball is common. Why?
They go together, and baseball is throwing motion (flexion + pronation)
39
What elbow muscles are anterior/flexor group
Biceps brachii Brachialis Brachioradialis
40
What elbow muscles are posterior/extensor group
Triceps brachii Anconeus
41
fibro-osseous canal through which ulnar nerve passes through
cubital tunnel | SUPER SUPERFICIAL
42
What increases cubital tunnel volume?
elbow held in extension
43
What decreases cubital tunnel volume?
full elbow flexion, space occupying lesions, OA, RA, heterotopic bone formation, trauma to nerve
44
borders of the cubital tunnel
Floor – UCL Roof – aponeurosis, arcuate lig Posterior – medial head of triceps Anterior – medial epicondyle Lateral – olecranon
45
borders of the cubital fossa
Lateral – brachioradialis, ECRL Medial – PT Proximal – imaginary line that passes through humeral condyles Floor – brachialis
46
cubital fossa contents
distal biceps tendon median n. brachial a. radial n. medial cubital cutaneous v.
47
Elbow has good blood and nerve supply! What are the arteries?
1. brachial artery 2. radial artery 3. ulnar artery 4. middle and radial collateral arteries 5. superior and inferior ulnar collateral arteries
48
Posterior / extensor-supinator forearm group
Supinator ECRL, ECRB, EDC, EDM, EI, ECU, APL
49
Anterior / flexor-pronator forearm group
Pronator teres Pronator quadratus FCR, FCU, FDS, FDP, PL
50
If you lose flexion/extension, will you lose supination/pronation?
YES, interdependent, esp at end ROM they share a joint capsule
51

becky: MSK UQ (18 decks)

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