Arthrex TSA IOT- Questions & Answers
humeral articular cartilage makes up how much of the humeral head sphere Correct Ans-1/3
T/F there is a constant ratio between humeral head diameter of the sphere and the height of
the articular cartilage Correct Ans-True
where is the approximate line of humeral head osteotomy Correct Ans-the anatomic neck
how many degrees of retroversion occurs anatomically and where Correct Ans-30- 10 at
elbow and 20 at humeral head
4 main glenoid morphological considerations Correct Ans-depth, version, inclination,
anatomic position w/ respect to the rest of the scapula
what can cause changes to the 4 main morphological considerations Correct Ans-arthritis on
glenoid can causes changes in depth, version, inclination,anatomic position w/ respect to the
rest of the scapula
Walch Classification Correct Ans-glenoid arthritic changes
Walch Classification A Correct Ans-humeral heads are center in the glenoid
,Walch Classification A1 Correct Ans-no glenoid erosion, humeral head is in the center of the
glenoid
Walch Classification A2 Correct Ans-humeral head is center in glenoid, major glenoid erosion
Walch Classification B Correct Ans-humeral heads are subluxed posterior
Walch Classification B1 Correct Ans-posterior subluxed humerus, narrowing G-H often due to
subchondral sclerosis
Walch Classification B2 Correct Ans-posterior subluxed humerus, retroverted glenoid,
posterior rim erosion, posterior erosion of glenoid causing a definitive paleo-glenoid and neo-
glenoid
Walch Classification C Correct Ans->25 degrees of retroversion regardless of erosion,
dysplastic glenoid
Most common glenoid wear pattern in shoulder OA Correct Ans-retroversion / posterior
wear
hallmarks of OA on xrays Correct Ans-osteophytes, subchondral cysts, joint space narrowing
, most common shoulder arthritis Correct Ans-OA
most common surgical approach for TSA/ RTSA Correct Ans-Deltopectoral approach
Hallmarks of Rotator Cuff Arthropathy Correct Ans-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 Ans-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 Ans-T
retroversion Correct Ans-turning backward, Posterior angulation of the glenoid, towards
acromion
anteversion Correct Ans-turning forward, anterior angulation of the glenoid, towards
coracoid
humeral articular cartilage makes up how much of the humeral head sphere Correct Ans-1/3
T/F there is a constant ratio between humeral head diameter of the sphere and the height of
the articular cartilage Correct Ans-True
where is the approximate line of humeral head osteotomy Correct Ans-the anatomic neck
how many degrees of retroversion occurs anatomically and where Correct Ans-30- 10 at
elbow and 20 at humeral head
4 main glenoid morphological considerations Correct Ans-depth, version, inclination,
anatomic position w/ respect to the rest of the scapula
what can cause changes to the 4 main morphological considerations Correct Ans-arthritis on
glenoid can causes changes in depth, version, inclination,anatomic position w/ respect to the
rest of the scapula
Walch Classification Correct Ans-glenoid arthritic changes
Walch Classification A Correct Ans-humeral heads are center in the glenoid
,Walch Classification A1 Correct Ans-no glenoid erosion, humeral head is in the center of the
glenoid
Walch Classification A2 Correct Ans-humeral head is center in glenoid, major glenoid erosion
Walch Classification B Correct Ans-humeral heads are subluxed posterior
Walch Classification B1 Correct Ans-posterior subluxed humerus, narrowing G-H often due to
subchondral sclerosis
Walch Classification B2 Correct Ans-posterior subluxed humerus, retroverted glenoid,
posterior rim erosion, posterior erosion of glenoid causing a definitive paleo-glenoid and neo-
glenoid
Walch Classification C Correct Ans->25 degrees of retroversion regardless of erosion,
dysplastic glenoid
Most common glenoid wear pattern in shoulder OA Correct Ans-retroversion / posterior
wear
hallmarks of OA on xrays Correct Ans-osteophytes, subchondral cysts, joint space narrowing
, most common shoulder arthritis Correct Ans-OA
most common surgical approach for TSA/ RTSA Correct Ans-Deltopectoral approach
Hallmarks of Rotator Cuff Arthropathy Correct Ans-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 Ans-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 Ans-T
retroversion Correct Ans-turning backward, Posterior angulation of the glenoid, towards
acromion
anteversion Correct Ans-turning forward, anterior angulation of the glenoid, towards
coracoid
