Station 4: The Elbow

Question 1

The Elbow Joint

Name and Classify the bones of the Elbow Joint

Answer 1

Bones:

• Humerus
• Ulna
• Both Long bones

Question 2

Joints at the Elbow

Name and Classify the Joints at the Elbow

What actions occur at these joints

Answer 2

1. The Elbow Joint
   - Humerus to Ulna
   - Synovial Hinge Diathrotic Uniaxial
   - Actions: Flexion & Extension of forearm
2. Proximal Radio Ulna Joint
   - Radius and Ulna (top)
   - Synovial Pivot Diathrotic Uniaxial
   - Actions: Rotation of radius around axis to allow for pronation and supernation of wrist

Question 3

Ligaments of the Elbow

Name and Role of Ligaments at the Elbow

Factors of Stability

Answer 3

1. Annular Ligament
   - Wraps around the radius at the Proximal Radioulna joint
   - DOES NOT ATTACH TO RADIUS
   - Allows for pronation and supernation
2. Ulna collateral Ligament
   - Runs in line with the Ulna
   - Allows for flexion and extension of elbow
3. Radial collateral Ligament
   - Runs in line with Radius
   - Merges into Annular Ligament
   - Allows for flexion and extension of elbow

Factors of Stability in order of importance:

1. Bones - Shape of articulating surfaces
2. Ligaments