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Arthrex TSA IOT FINAL EXAM STUDYGUIDE 2025 QUESTIONS AND DETAILED CORRECT ANSWERS | A+ GRADE
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Arthrex TSA IOT FINAL EXAM STUDYGUIDE 2025 QUESTIONS AND DETAILED CORRECT ANSWERS | A+ GRADE
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Arthrex TSA IOT FINAL EXAMSTUDYGUIDE 2025 QUESTIONS AND
DETAILED CORRECT ANSWERS | A+
GRADE
Hallmarks of Rotator Cuff Arthropathy Correct Answer
Severe RTC muscle atrophy and degeneration on CT
Scan/ MRI
Humeral head elevation on x-ray
Intact axillary nerve conduction on EMG/ nerve conduction
study
Decreased acromio-humeral distance
T/F When humeral head was not positioned anatomically,
glenoid was 6.6 more times likely to require removal
Correct Answer T
T/F Glenoid implant failure is dependent on position of
humeral component and can change 13 years survival
when positioned anatomically vs 8 years Correct Answer T
retroversion Correct Answer turning backward, Posterior
angulation of the glenoid, towards acromion
anteversion Correct Answer turning forward, anterior
angulation of the glenoid, towards coracoid
inclination is also called Correct Answer neck shaft angle,
neck angle in regards to humeral axis
,inclination range Correct Answer 115-148
inclination sweet spot Correct Answer 125-140
inclination anatomic average Correct Answer 132.5
Superior Escape is the result of what dysfunctional
muscle/tendon? Correct Answer supra
Anterior Escape is the result of what dysfunctional
muscle/tendon? Correct Answer subscap
posterior escape is the result of what Correct Answer
glenoid erosion, posterior capsular laxity, overtightening of
labrum-capsule
humeral head escape Correct Answer Humeral head is no
longer centered anatomically in the glenoid and is
subluxed
version Correct Answer rotation of the humerus in relation
to the neutral glenoid, as well as the alignment or
angulation of the glenoid face in relation to the neutral
scapula
Average retroversion is 30
More retroversion can occur from arthritic changes
humeral head center of rotation Correct Answer
Biomechanically fixed point with zero velocity as the
humerus rotates within the G-H joint
, Directly in line with lesser tuberosity
COR NOT IN LINE WITH CENTER OF DIAPHYSIS OF
HUMERUS (where stem goes)
humeral head COR has what kind of location Correct
Answer Natural medial- posterior offset
arthrex univers II gelons have a ____ offset because
of____ Correct Answer 3.5mm offset because COR has a
natural medial- posterior offset (does not line up to center
of diaphysis of humerus where stem goes)
Glenohumeral Mismatch Correct Answer relationship/
difference in the radius of humeral head and glenoid
components
Mismatch- variation in curvature of 2 articulating side
- Round ball on flat surface= unstable
o Zero mismatch
- Round ball on congruent surface= constrained
o You want a balance between mismatch and constrained
- Want the ball to move around the glenoid for mobility but
not too much where they are unstable
oRange 0-10 (0 being no mismatch)= 5.5mm ideal
mismatch
Varus (latin for crooked) implant Correct Answer When
implant is not centered in canal but distal aspect of the
humerus is midline to the distal prosthesis
Causes stress/ fractures
Goal to put in neutral or valgus alignment
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