Kinematic Chains and Joint Movements

Dr. K explains the arthrokinematics of the elbow joints, focusing on the humeral ulnar and humeral radial articulations. The video covers the classification of these joints, their movements in open and closed kinematic chains, and the specific arthrokinematics involved in flexion and extension. The video concludes with a summary of the key concepts discussed.

What are the two main articulations forming the elbow joint?

• Humeral radial and humeral femoral

• Humeral scapular and humeral radial

• Humeral ulnar and humeral radial

• Humeral ulnar and humeral scapular

How is the humeral ulnar joint classified?

• Ball and socket joint

• Modified hinge joint

• Saddle joint

• Pivot joint

What type of movement does the humeral radial joint allow?

• Sliding

• Pivoting

• Rotation

• Gliding

In an open kinematic chain, which segment is free to move?

• Neither segment

• Both segments

• Distal segment

• Proximal segment

What is an example of a closed kinematic chain movement?

• Throwing a ball

• Performing a push-up

• Bending an elbow to drink

• Lifting a dumbbell

During flexion in an open kinematic chain, how does the ulna move?

• Rolls and glides anteriorly

• Rolls and glides posteriorly

• Rolls posteriorly, glides anteriorly

• Rolls anteriorly, glides posteriorly

In a closed kinematic chain, how does the humerus move during flexion?

• Rolls and glides anteriorly

• Rolls posteriorly, glides anteriorly

• Rolls anteriorly, glides posteriorly

• Rolls and glides posteriorly

What happens to the roll and glide when a convex object moves on a concave surface?

• They occur randomly

• They occur in the same direction

• They occur in opposite directions

• They do not occur

During extension in an open kinematic chain, how does the radius move?

• Rolls posteriorly, glides anteriorly

• Rolls anteriorly, glides posteriorly

• Rolls and glides posteriorly

• Rolls and glides anteriorly

In a closed kinematic chain, how does the humerus move during extension?

• Rolls and glides anteriorly

• Rolls posteriorly, glides anteriorly

• Rolls and glides posteriorly

• Rolls anteriorly, glides posteriorly