Biomechanics Quiz 8

Question 1

Articulation of what two bones occur on the subtalar joint?

Answer 1

1. talus

2. calcaneus

Question 2

The subtalar joint creates what planar motion? And around how many axes?

Answer 2

triplanar motion around 1 axis

Question 3

Subtalar is critical for what?

Answer 3

dampening forces while maintaining foot contact with ground

Question 4

The Subtalar joint rarely dislocates due to what ligament?

Answer 4

The interosseous talcocalcaneal ligament (ITL)

Question 5

the Subtalar joint axis dorsiflexes how many degrees up from horizontal plane?

Answer 5

42*

Question 6

the Subtalar joint axis abducts how many degrees from sagittal plane (medially)?

Answer 6

16*

Question 7

pronation of the calcaneus with non-weightbearing involves what osteokinematics?

Answer 7

1. everts
2. abducts
3. dorsi-flexes

Question 8

supination of the calcaneus with non-weightbearing involves what osteokinematics?

Answer 8

1. inverts
2. adducts
3. plantar-flexes

Question 9

What are the 2 plantar flexors?

Answer 9

1. gastrocnemius

2. soleus

Question 10

What are the dorsi-flexors?

Answer 10

1. tibialis interior

2. extensor digitorum longus (EVL)

Question 11

What are the Evertors?

Answer 11

1. Peroneus (Fibularis) Longus

2. Peroneus (Fibularis) Brevis

Question 12

What are the Invertors?

Answer 12

1. Tibialis Anterior

2. Tibialis Posterior

Question 13

What part of the humerus is broken most often and by whom?

Answer 13

• the surgical neck

* by the elderly

Question 14

What is the Sternoclavicular Joint?

Answer 14

Mechanical strut holding the scapula at a relatively constant distance from the trunk.

Question 15

What is the Acromioclavicular Joint?

Answer 15

Firmly attaches scapula to clavicle

Question 16

What is the Scapulothoracic Joint? Is it a true anatomic joint?

Answer 16

Provides a base of operation for the glenohumeral joint.

Not a true anatomic joint.

Question 17

What is the Glenohumeral Joint?

Answer 17

Most distal and mobile link of the shoulder complex.

Question 18

What does the Sternoclavicular (SC) Joint do?

Answer 18

1. Links the appendicular skeleton with the axial skeleton

2. Firmly attached (stable) joint with considerable ROM

Question 19

what is referred to as the “boxer’s muscle”?

Answer 19

The seratus anterior

Question 20

What type of cartilage is the articular disc of the SC joint made of?

Answer 20

fibrocartilage

Question 21

(SC joint kinematics) elevation and depression occur about which axis?

Answer 21

A/P axis

Question 22

(SC joint kinematics) Protraction and Retraction occur about which axis?

Answer 22

vertical axis (nearly parallel to horizontal plane)

Question 23

Is the SC joint a true joint?

Answer 23

no

Question 24

What does the motion of the SC strongly associate with?

Answer 24

protraction and retraction of scapula

Question 25

(SC joint kinematics) Axial (Longitudinal) Rotation occurs about what axis?

Answer 25

rotation about long axis of clavicle

Question 26

(SC joint kinematics) Sternal end of clavicle spins on what?

Answer 26

articular disc

Question 27

Acromioclavicular (AC) Joint has how many axes? What's its function?

Answer 27

non-axial *for gliding and sliding

Question 28

Kinematics of AC joint permit what kind of movements?

Answer 28

subtle movements between scapula and end of lateral clavicle *multi-plane "adjustments"

Question 29

Is the Scapulothoracic “Joint” a true joint?

Answer 29

no

Question 30

Movements that occur between the scapula and thorax are a result of cooperation

Answer 30

between the SC and AC joints

Question 31

A/C joint is what type of joint?

Answer 31

synovial joint

Question 32

Is the scapulothoracic joint a synovial joint?

Answer 32

no

Question 33

pronation at subtalar mostly uses?

Answer 33

eversion and abduction

Question 34

movement in 3 planes at SC joint are involved in what?

Answer 34

the articular disc