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Flashcards in Elbow and Forearm Deck (35)
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1

What boney surfaces make up the radiohumeral joint?

head of the radius and capitulum of humerus

2

What boney surfaces make up the humeral ulnar joint?

trochlea of the humerus, trochlear notch of the ulna

3

What additional motion also occurs in elbow extension?

forearm abduction

4

What is gunstock position?

gunstock = loss of the normal cubital valgus (13 deg), so arm is almost straight

5

What portion of the UCL in the elbow resists the first stages of valgus?

anterior band

6

What ligament blends with the annular ligament?

RCL

7

T/F: The UCL has two parts.

false, UCL has 3 portions; RCL has 2 portions

8

What does the transverse portion of the UCL do, mainly?

stabilizes the elbow joint (the anterior and posterior portions resist more of the valgus force)

9

What ligament is there to prevent damage from falls on an outstretched hand?

ulnar portion of lateral collateral ligament; provides posteriolateral tension

10

What are the arthrokinematics of the elbow?

flex = anterior roll and slide
extend = posterior roll and slide

11

T/F: The flexors are stretched in elbow flexion.

false, they're compressed

12

What is the functional range for ADLs for elbow flexion/extension?

30-130 degrees (instead of 0-145 normally)

13

The interosseous membrane helps distribute what kind of forces? What is it not good at distributing?

interosseous membrane
- good for compressive forces (like falls) at radiocarpal jt
- bad for distractive forces

14

What do we have more range in, pronation or supination?

supination, by 10 degrees (85 vs 75)

15

What ligament supports the proximal radioulnar joint?

annular ligament

16

T/F: When we supinate, our GH joint automatically goes into external rotation.

true, a little bit of ER
- keep limb close to body when measuring supination so pt. can't cheat with ER

17

What is the open-pack position for the humeroulnar joint?

70 degrees flexion, 10 degrees supination

18

What is the open-pack position for the distal radioulnar joint?

10 degrees supination (5 degrees is closed pack)

19

What arthrokinematics occur at the proximal radioulnar joint?

just spin, since the annular ligament is so tight

20

What arthrokinematics occur at the distal radioulnar joint?

radius moves on ulna (concave on convex)
- supination = dorsal roll and slide
- pronation = palmar roll and slide

21

What functional range is needed for ADLs for pronation/supination?

50 degrees either way

22

What is the triangular fibrocartilage complex? What's it do?

TFCC = connects ulna to carpal bones, provides stability
- connects radius and ulna, and radius and carpal bones too
- consists of capsule, fibrocartilage disk, and ligaments

23

If the interosseus membrane isn't distributing forces appropriately, what will happen to the joint?

decreased joint space, due to degeneration (on medial side?)

24

The certain elbow flexors being utilized are dependent on what?

elbow joint position (pronated, supinated, flexed)

25

What muscle is the workhorse of elbow flexion?

brachialis

26

What muscle is the workhorse of elbow extension?

medial head of tricep (then lateral, then long)

27

At what angle is torque maximized for the bicep?

90 degrees elbow flexion

28

What elbow flexor is used in rapid movements for power?

brachioradialis

29

What has the shortest moment arm of the elbow flexors? Longest?

shortest moment arm = pronator teres
longest moment arm = brachioradialis

30

T/F: Elbow and wrist flexors are both stronger than their opposing extensors.

true