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Biomechanics > Biomechanics Quiz 8 > Flashcards

Biomechanics Quiz 8 Flashcards

1
Q

Articulation of what two bones occur on the subtalar joint?

A
  1. talus

2. calcaneus

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2
Q

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

A

triplanar motion around 1 axis

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3
Q

Subtalar is critical for what?

A

dampening forces while maintaining foot contact with ground

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4
Q

The Subtalar joint rarely dislocates due to what ligament?

A

The interosseous talcocalcaneal ligament (ITL)

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5
Q

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

A

42*

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6
Q

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

A

16*

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7
Q

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

A
  1. everts
  2. abducts
  3. dorsi-flexes
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8
Q

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

A
  1. inverts
  2. adducts
  3. plantar-flexes
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9
Q

What are the 2 plantar flexors?

A
  1. gastrocnemius

2. soleus

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10
Q

What are the dorsi-flexors?

A
  1. tibialis interior

2. extensor digitorum longus (EVL)

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11
Q

What are the Evertors?

A
  1. Peroneus (Fibularis) Longus

2. Peroneus (Fibularis) Brevis

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12
Q

What are the Invertors?

A
  1. Tibialis Anterior

2. Tibialis Posterior

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13
Q

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

A
  • the surgical neck

* by the elderly

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14
Q

What is the Sternoclavicular Joint?

A

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

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15
Q

What is the Acromioclavicular Joint?

A

Firmly attaches scapula to clavicle

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16
Q

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

A

Provides a base of operation for the glenohumeral joint.

Not a true anatomic joint.

17
Q

What is the Glenohumeral Joint?

A

Most distal and mobile link of the shoulder complex.

18
Q

What does the Sternoclavicular (SC) Joint do?

A
  1. Links the appendicular skeleton with the axial skeleton

2. Firmly attached (stable) joint with considerable ROM

19
Q

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

A

The seratus anterior

20
Q

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

A

fibrocartilage

21
Q

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

A

A/P axis

22
Q

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

A

vertical axis (nearly parallel to horizontal plane)

23
Q

Is the SC joint a true joint?

A

no

24
Q

What does the motion of the SC strongly associate with?

A

protraction and retraction of scapula

25
Q

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

A

rotation about long axis of clavicle

26
Q

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

A

articular disc

27
Q

Acromioclavicular (AC) Joint has how many axes?

What’s its function?

A

non-axial

*for gliding and sliding

28
Q

Kinematics of AC joint permit what kind of movements?

A

subtle movements between scapula and end of lateral clavicle

*multi-plane “adjustments”

29
Q

Is the Scapulothoracic “Joint” a true joint?

A

no

30
Q

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

A

between the SC and AC joints

31
Q

A/C joint is what type of joint?

A

synovial joint

32
Q

Is the scapulothoracic joint a synovial joint?

A

no

33
Q

pronation at subtalar mostly uses?

A

eversion and abduction

34
Q

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

A

the articular disc

Biomechanics (10 decks)

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