Biomechanics Exam 5 UPDATED Study
Guide QUESTIONS AND CORRECT
ANSWERS
Reduction - CORRECT ANSWERS Which of the follwing is a widely
used approach to determining a unique solution to a statically indeterminate
problem is muscle musculoskeletal biomechanics:
Peak tibiofemoral forces were sensitive to activations of muscle of the lower
limb, especially during the late stance phase of walking - CORRECT
ANSWERS Authors of "Changes in Tibiofemoral Forces due to
Variations in Muscle Activity during Walking" were able, within an
optimization framework, to systematically vary the coordination of muscles to
determine the influence on tibiofemoral force. One of their finding was:
False - CORRECT ANSWERS The main contributor to intrinsic
stability of the elbow is the articulation between the capitulum of the humerus
and the radial head.
Ulnar or medical collateral ligament - CORRECT ANSWERS The
overhead throwing motion produces very high tensile stresses on medial side of
the elbow (valgus load). This stress is carried mainly by the __________
Abductions - CORRECT ANSWERS Referring to motion of the
shoulder, the drawing at right depicts _______________.
1/4 - 1/3 - CORRECT ANSWERS Surface area of the glenoid fossa is
______________ that of the humeral head, which allows a significant freedom
of movement.
, Rotator cuff - CORRECT ANSWERS The _______________ provides
dynamic restraints to anterior, posterior, and inferior displacement of the
glenohumeral joint
They stabilize the humeral head on the glenoid - CORRECT ANSWERS
In the example shown at right, the deltoid and oblique rotator cuff muscles
function as a force couple to abduct the shoulder joint. What is the importance
of the offsetting vertical force components?
Rotator cuff insufficiency (i.e., torn rotator cuff) - CORRECT ANSWERS
A reverse total shoulder replacement may be performed instead of an
anatomical shoulder replacement in cases of _________________
Reverse total shoulder arthroplasty increased the deltoid moment arm relative to
primary (anatomic) arthroplasty - CORRECT ANSWERS In the study
"Reverse total shoulder arthroplasty component center of ratation affects muscle
function" it was reported that:
Forward flexion - CORRECT ANSWERS An abdominal cavity with a
cross-sectional area of 300 cm^2 and a pressure of 13.3 kPa producese a
resultant force of about 400 N acting to resist torso ________________ and
reduce compressive loads on the lumbar spine.
Hydrostatic stress - CORRECT ANSWERS During compressive loading
of a spinal motion segment, the nucleus pulposus exerts a ________________
to distribute pressure uniformly throughout the intervertebral disc.
False - CORRECT ANSWERS The facet joints in the spine are
essentially non-load bearing, especially in hyperextension and in combined
flexion and rotation:
Guide QUESTIONS AND CORRECT
ANSWERS
Reduction - CORRECT ANSWERS Which of the follwing is a widely
used approach to determining a unique solution to a statically indeterminate
problem is muscle musculoskeletal biomechanics:
Peak tibiofemoral forces were sensitive to activations of muscle of the lower
limb, especially during the late stance phase of walking - CORRECT
ANSWERS Authors of "Changes in Tibiofemoral Forces due to
Variations in Muscle Activity during Walking" were able, within an
optimization framework, to systematically vary the coordination of muscles to
determine the influence on tibiofemoral force. One of their finding was:
False - CORRECT ANSWERS The main contributor to intrinsic
stability of the elbow is the articulation between the capitulum of the humerus
and the radial head.
Ulnar or medical collateral ligament - CORRECT ANSWERS The
overhead throwing motion produces very high tensile stresses on medial side of
the elbow (valgus load). This stress is carried mainly by the __________
Abductions - CORRECT ANSWERS Referring to motion of the
shoulder, the drawing at right depicts _______________.
1/4 - 1/3 - CORRECT ANSWERS Surface area of the glenoid fossa is
______________ that of the humeral head, which allows a significant freedom
of movement.
, Rotator cuff - CORRECT ANSWERS The _______________ provides
dynamic restraints to anterior, posterior, and inferior displacement of the
glenohumeral joint
They stabilize the humeral head on the glenoid - CORRECT ANSWERS
In the example shown at right, the deltoid and oblique rotator cuff muscles
function as a force couple to abduct the shoulder joint. What is the importance
of the offsetting vertical force components?
Rotator cuff insufficiency (i.e., torn rotator cuff) - CORRECT ANSWERS
A reverse total shoulder replacement may be performed instead of an
anatomical shoulder replacement in cases of _________________
Reverse total shoulder arthroplasty increased the deltoid moment arm relative to
primary (anatomic) arthroplasty - CORRECT ANSWERS In the study
"Reverse total shoulder arthroplasty component center of ratation affects muscle
function" it was reported that:
Forward flexion - CORRECT ANSWERS An abdominal cavity with a
cross-sectional area of 300 cm^2 and a pressure of 13.3 kPa producese a
resultant force of about 400 N acting to resist torso ________________ and
reduce compressive loads on the lumbar spine.
Hydrostatic stress - CORRECT ANSWERS During compressive loading
of a spinal motion segment, the nucleus pulposus exerts a ________________
to distribute pressure uniformly throughout the intervertebral disc.
False - CORRECT ANSWERS The facet joints in the spine are
essentially non-load bearing, especially in hyperextension and in combined
flexion and rotation:
