Elbow Articulations Flashcards
What makes up the Radiohumeral joint of the elbow?
Ball and socket capitulum (convex surface)
Head of the radius (concave)
What is the osteokinematic motion of the radiohumeral joint?
Flexion/Extension
Pronation/Supination
What is the loose packed position of the radiohumeral joint?
Full extension, supination
Closed packed position of the radiohumeral joint?
90 degrees flexion, 5 degrees supination
Capsular Pattern of the Radiohumeral Joint?
Flexion > Extension> Supination > Pronation
What is the ulnohumeral joint formed by?
Hourglass-shaped trochlea of the humerus
Trochlear notch of the ulna
Osteokinematic motion of Ulnohumeral joint?
Flexion/Extension
Loose packed position of the ulnohumeral joint?
70 degrees elbow flexion, 10 degrees supination
Closed packed position of the ulnohumeral joint?
Extension
Capsular Pattern of the ulnohumeral joint?
Flexion > Extension
Proximal Radioulnar Joint is composed of?
Radial notch of the ulna(concave)
Rim of the Radial head (convex)
Osteokinematic motion of the Proximal radioulnar joint?
Pronation/supination
Loose packed position of the proximal radioulnar joint?
70 degrees elbow flexion, 35 degrees supination
Closed packed position of the proximal radioulnar joint?
5 degrees supination
Capsular pattern of the Proximal radioulnar joint?
Supination > pronation
What does the annular ligament surround?
The head of the radius
What is the purpose of the annular ligament?
It allows the head of the radius to rotate and retain contact wit the radial notch of the ulna
Where does the anterior ligament of the elbow attach?
Stretches from the radial collateral ligament and attaches above the upper edge of the Coronado fossa, extending just below the coronoid process
Where is the cubical fossa located?
Triangular space located at the anterior elbow
What is the cubical fossa bordered by?
- Brachioradialis
- Pronator teres
- Brachialis
- Horizontal line passing through the humeral epicondyles
What does the cubital fossa contain?
- Biceps Brachii tendon
- Median nerve
- Radial nerve
- Brachial artery
- Median cubital vein
What is the cubital tunnel?
Space formed by the:
- ulnar collateral ligament
- Flexor Capri ulnaris
- Medial head of the triceps
- Medial epicondyle
What nerve runs through the cubital tunnel?
The ulnar nerve
When does the cubital tunnel become the smallest?
When the elbow is in full flexion
Where is the olecranon bursa located?
Lies posterior to the olecranon process and is considered the main bursa in the elbow
When does the olecranon typically become inflamed?
With direct trauma to the elbow due to its superficial position
Where is the posterior ligament of the elbow located?
Blends on each side with the collateral ligaments and is attached to the upper position of the olecranon fossa, just below the olecranon process
Where is the radial collateral ligament (lateral collateral ligament) located?
Extends from the lateral epicondyle of the humerus to the lateral border and olecranon process of the ulna and to the annular ligament
What is the purpose of the RCL (LCL) ligament?
It is fan-shaped and prevents adduction of the elbow joint + provides reinforcement of the radiohumeral articulation
Where is the Ulnar Collateral Ligament (Medial collateral ligament) located?
Runs from the medial epicondyle of the humerus to the Proximal portion of the ulna
What is the purpose of the UCL (MCL)?
Prevents excessive abduction of the elbow joint
What athlete is most likely to present with an injury to the LCL and MCL of the elbow?
Baseball players—ligaments become frayed or torn through the stress of repetitive throwing motions
FOOSH can also rupture collateral ligaments which is often associated with elbow dislocation
