USAHS Biomechanics Unit 6 Exam Questions and Correct Answers Already Passed
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Course
USAHS Biomechanics
Institution
USAHS Biomechanics
USAHS Biomechanics Unit 6 Exam Questions and Correct Answers Already Passed
Which arthrokinematic movement takes place at the radialhumeral joint during supination and pronation? - Answer- Spin; radial head spins on the capetellum
Which rule applies to the elbow (radialhumeral) joint during f...
USAHS Biomechanics Unit 6 Exam
Questions and Correct Answers
Already Passed
Which arthrokinematic movement takes place at the radialhumeral joint during
supination and pronation? - Answer- Spin; radial head spins on the capetellum
Which rule applies to the elbow (radialhumeral) joint during flexion? - Answer- Concave
on convex; capitulum rolls and slides in the same direction on the radial head
Which rule applies to the wrist (radiocarpal) joint during ulnar deviation? - Answer-
Convex on concave; carpal bones roll (medially) and slide (laterally) in opposite
directions
Which rule applies to the wrist (radiocarpal) joint during radial deviation? - Answer-
Convex on concave; carpal bones roll (laterally) and slide (medially) in opposite
directions
Which rule applies to the metacarpophalangeal joint during flexion? - Answer- Concave
on convex; proximal phalanx rolls and slides anteriorly in the same direction on the
metacarpal
Which rule applies to the ankle (talocrural) joint during dorsiflexion? - Answer- Convex
on concave; talus rolls anteriorly and slides posteriorly on the distal tibia and fibula
What are kinematic chains? - Answer- A series of articulated segmented links, such as
the pelvis, thigh, leg, and foot connected by the hip, knee, and ankle
What is an open kinematic chain? - Answer- When the distal end of the kinetic chain is
not fixed to the earth or an immovable object and is free to move in space
What is a closed kinematic chain? - Answer- When the distal end of the kinetic chain is
fixed to the earth or an immovable object and the proximal segment is free to move on
the fixed distal segment
The swing phase of gait is an example of which kind of kinematic chain? - Answer-
Open kinematic
, Kicking a ball is an example of which kind of kinematic chain? - Answer- Open
kinematic
Throwing a ball is an example of which kind of kinematic chain? - Answer- Open
kinematic
The stance phase of gait is an example of which kind of kinematic chain? - Answer-
Closed kinematic
Squatting is an example of which kind of kinematic chain? - Answer- Closed kinematic
Push ups are an example of which kind of kinematic chain? - Answer- Closed kinematic
What are the two types of joint articular positions? - Answer- Close-packed and loose-
packed positions
What are the characteristics of a close-packed position? - Answer- - maximum
congruency
- maximum ligament and capsule tightness
- minimal joint space
- good position for static load bearing
- poor position for joint mobilization
What are the characteristics of a loose-packed position? - Answer- - minimum
congruency
- ligaments and capsule slack
- maximum joint space, minimal joint surface loading
- poor position for static load bearing
- best position of joint mobilization
Full knee extension is an example of which joint articular position? - Answer- Close-
packed
20-30 degrees of knee flexion is an example of which joint articular position? - Answer-
Loose-packed
Why is it important for the hip, knee, and ankle to be in close-packed positions at heel
off (terminal stance) during the stance phase of the gait cycle? - Answer- Provides
stability for push off
Why is it important for the hip, knee, and ankle to be in/closer to loose-packed positions
and more mobile during the swing phase of the gait cycle? - Answer- Allows the joints to
conform and adjust their positions when the heel strikes the ground and begins to
accept weight
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