Upper Extremity Flashcards
What structure deepens the glenoid fossa and improves stabilization?
Articular Labrum
What structure also reinforces the glenoid fossa and what reinforces this structure?
- The Joint Capsule, which consists of 4 ligaments.
- There are 3 glenohumeral ligaments and 1 coraco-humeral ligament (most superior)
What is the loose packed position of the GHJ?
40 to 50 degrees of scaption (in between flexion and abduction)
What is the closed packed position of the GHJ?
Full abduction and External rotation
What is the arthrokinematics surrounding the GHJ?
Because the Convex Humeral Head is moving on the Concave Glenoid Fossa, the roll and glide are in opposite directions.
What is the LPP of the ACJ?
The arm at rest
What is the CPP of the ACJ?
90 degrees of shoulder abduction
What are the convex and concave surfaces of the ACJ and how does it relate to its motions?
- The distal clavicle is the convex surface, and the acromion is the concave surface.
-Come back to this question
Why does the roll and glide directions change based on the particular movement within the SCJ?
This is due to its saddle shape, which means the convex and concave surfaces between the manubrium and the clavicle change in respect to the motion.
- List the Examples here
What are the arthrokinematics related to the SCJ?
- Elevation/Depression = Convex clavicle on the concave manubrium = Roll and glide in opposite directions
- Protraction/Retraction = Concave manubrium on the convex clavicle = roll and glide in the same direction.
How many degrees of motion are available due to the SCJ?
- Elevation/Depression = 60 Degrees
- Protraction/Retraction = 40 Degrees
What is the LPP and CPP of the ACJ?
- LPP = Arm at rest
- CPP = Full elevation and protraction
How much motion is contributed to the scapulo-thoracic articulation? (STA)
- 60 degrees of shoulder elevation
What is the functional importance of the STA?
- Provides a structural base to the humeral head
- Preserves the optimal length-tension relationship of the scapulo-humeral.
- Helps to maintain space/volume weihtin the subacromial space to prevent impingement.
What is the ratio of ROM between the GHJ and the Scapula?
1/3 comes from the scapula and 2/3 comes from the GHJ
List all SCJ Motions based on the roll and glide
- Elevation = Roll and Glide are in opposite directions because convex on concave
- Depression = Roll and Glide are in opposite directions because convex on concave
- Elevation in respect to the clavicle = Cranial glide because roll and glide are in opposite directions
- Depression in respect to the clavicle = Caudal glide because roll and glide are in opposite directions
- Protraction/Retraction = Roll and glide are in the same direction because it concave on convex.
Protraction = Anterior Glide; Retraction = Posterior Glide
What is the total ROM of the ACJ?
30 degrees for anterior and posterior rotation, as well as internal and external rotation.
What are the 3 joints that make up the elbow? List out their arthrokinematics as well.
- Humeroulnar Joint = Concave on convex = Same sided roll and glide
- Humeroradial Joint = Concave on convex = Same sided roll and glide
- Proximal Radioulnar Joint (PRUJ)
What are the LPP for Humeroulnar and Humeroradial Joint?
Humeroulnar Joint = Elbow flexion of 70 degrees and 10 degrees of supination
Humeroradial Joint = Full extension and supination
What are the CPP for humeroulnar and humeroradial joint?
Humeroulnar = Elbow extended and supinated
Humeroradial = Elbow flexed to 90 and slight supination
What is the arthrokinematics of the Distal radioulnar joint?
Convex head of the ulna moves in the concave ulnar notch of the radius
Opposite direction for roll and glide
What are the LPP and CPP of the wrist joint?
LPP: Wrist in neutral with slight ulnar deviation
CPP: Maximal Extension with maximal radial deviation
What are the arthrokinematics of the CMC
Abduction and Adduction = Convex on Concave = Roll and glide in opposite directions.
Flexion and extension = Concave on convex = roll and glide in same direction (Flexion = Ulnar Glide) (Extension = Radial Glide)
