EXAM 3 - hyper mobile shoulder Flashcards
what is the balance stability angle
the max angle between the glenoid center line and the net humeral joint reaction force before the humerous dislocates
what is the anterior compressor
subscap
what is the posterior compressor
infra and teres minor
what is the superior compressor
supra
what does concavity have to do with stablity
deeper the concavity the greater the displacement force for a compressive load
the greater the displacement force needed
what is the stablity ratio
displacing force/compressive load
what are the passive restraints to the shoulder
labrum
boney geometry
capsulo-ligamentous structures
negative intra-art pressure
what direction does the humeral head face
superior
medially
posteriorly
what is the function of scapular rotation
allows the glenoid to remain under the humeral head
ER - 0 restriants
CH
SGHL
subscapularis
ER - 45 restraints
MGHL
ER - 90 restraints
anterior band of IGHL
when is the subscap an effective restraint
when the arm is at its side
rotator interval
a triangluar area between the subscap and the base of the coracoid
this is one of the most common areas of disloaction
what is the action of the biceps tendon
increases torsional ridgity
what is torsional ridgity
the ability of an object to resist twisting when acted upon by an external force, torque
what happens to the bicep tendon with there is a slap lesion
the effect of the biceps tendon is lost
what is the most traumatic type of shoulder instablity
posterior
onset of instablity
traumatic
atraumatic
repetitive microtrauma/overuse
what does TUBS stand for
traumatic
unitlateral
bankart lesion
surgical repair
what is a bankart lesion
a tear that happens in the lower rim of the labrum.
the rim of the glenoid is being torn off and the humeral head is moving forward
AMBRI stands for
atraumatic
Multidirectional
bilateral
rehab
inferior capsular shift
how do we test for multi-direction instability
sulcus sign
Anterior mechnism
Posteriorly directed force with the arm abd and ER
this can also occur with issue from behind
Posterior mechnism
Posterior directed force with arm flexed and IR
inferior mechanism
Inferior force with the arm in abd
how to test for general glenoid instability
load and shift test
how to test for anterior instability
anterior drawer
anterior apprehension
how to test for posterior instablity
posterior drawer
combo: posterior apprehension, jerk test, kim test
slap lesion MOI
o Fall on outstretched arm
o Traction on long head of biceps associated with overhead throwing activity
o Internal impingement
o “Peel back” of labrum due to twisting of biceps tendon during abduction/ER
slap lesion symptoms
o Pain & mechanical catching/grinding (50% of cases)
test we can use for a slap lesion
o O’Brien’s test
o Crank test
o Biceps load test
o Biceps load test II
anterior slide test
what is a positive obrein’s test
AC pain or pain/click deep in the joint
top of the shoulder pain obrein’s
AC joint lesion
what is a positive anterior slide test
pain and/or click in front of shoulder in front of shoulder
crank test arm position
160 abd
biceps load positive test
pain with biceps activation
what are the two tests that look at the long head of the biceps tendon
speed test
yergasons
