SCAPULA Flashcards
Anatomical description of scapula
- triangular bone
- posterior
- 2nd - 7th ribs
LANDMARKS:
Superior Angle of scap
T2
LANDMARKS:
Inferior Angle of scap
T7
LANDMARKS:
Spine of scapula/Spinous process
T3
LANDMARKS: match the following
T3
T7
T2
T3: Spinous process/spine of scapula
T7: Inf. angle of scapula
T2: sup. angle of scapula
This the summit of the SH
Acromion Process
This is a hooked acromion process
Type III
This is a flat acromion process
Type I
This is the type IV acromion process
Upturned/ convex
This is the most common acromion process
Type II: curved
Type of acromion process associated c impingement syndrome
Type III: hooked
What is the orientation of the acromion process?
(PLeaSe): Post, Lat, Sup
Painful arc syndrome usually happens @ what degree of SH elevation
60-120 deg
How many angles does the scapula have?
3
How many borders does the scapula have?
3
It is where the subscapularis muscle attached to
Subscapularis fossa
Where does the infraspinatus and supraspinatus attaches
infraspinatus & supraspinatus fossa
The spine of the scapula can be a basis to locate what fossae
infraspinatus & supraspinatus fossa
This ligament prevents sup
translation of humerus
Coracoacromial lig.
This is the medial extension of acromion process
spine of scapula
This is a shallow cavity that is 1/3-1/2 of a sphere
Glenoid fossa
What is the amount of depth that the glenoid labrum provides?
50%
What is the orientation of the coracoid
Ant & sup.
This is the rarest type of acromion process
Type IV: upturned/convex
This is the most important false joint
Scapulothoracic jt
The AC joint is what type of joint?
synovial plane joint
PRIMARY lig. that prevents sup. translation of humerus
Conoid ligament (coracoclavicular lig)
these ligaments prevent sup. translation of humerus
Conoid ligament (coracoclavicular lig)
Inf. Acromioclavicular lig
PRIMARY lig. that prevents inf. translation of humerus
Sup. Acromioclavicular lig
AC jt has how many DOF
3
What age does the fibrocartilaginous union of the AC disc occur?
<2 y/o
@ >2 y/o, what happens to the AC disc?
fibrocartilaginous remnant that is meniscoid –>
Necessary components of scapular movement for full arm elevation:
Posterior tilting of scapula
Upward rotation of scapula
ligament that prevents medial displacement of scapula
Trapezoid lig.(coracoclavicular lig.)
This is the Phase of SH elevation wherein the scapula is in the setting phase
PHASE 1 (<30deg)
At the Phase III (>90deg) of SH elevation, what is the position of the scapula?
30 deg scapular elevation or upward rotation
At the Phase II (~90deg) of SH elevation, what is the position of the scapula?
20 deg scapular elevation or upward rotation
What is the ratio for ST rhythm?
After 30° of abd: 2:1 ratio occurs
What is the orientation of the glenoid fossa
SAL (sup, ant, lat.)
What is the 2 formula for getting scapulothoracic rhythm
A) FORMULA #1
Step 1: Given SH ROM divide by 3 = N
Step 2:
N x 2 (for GH)
N x 1 (for Scapula)
B) FORMULA #2
Step 1: Given SH ROM - 30 deg = N
Step 2: N divide by 3 = Y
Step 3:
(Y x 2) + 30 deg (for GH)
Y x 1 (for Scapula)
