Elbow Biomechanics

Question 1

Primary function of the elbow

Answer 1

It allows shortening and lengthening of the upper limb and forearm rotation and provides stability in closed-chain activities.

Question 2

three bones of the elbow

Answer 2

humerus, radius, ulna.

Question 3

main articulating joint of the elbow?

Answer 3

Humeroulnar joint, hinge of joint with great stability.

Question 5

Primary function of the elbow

Answer 5

Stability in closed chain activities, allows forearm rotation, adjusts hands distance from the shoulder. It has one of the most congruent joint designs in the body.

Question 6

Bones involved in elbow function

Answer 6

Humerus, radius, ulna

Question 7

What are key soft tissues of the elbow

Answer 7

Joint capsule, ligaments, (ulnar collateral, radial collateral, annular ligament) and tendons (biceps, triceps).

Question 8

What muscles facilitate elbow movement

Answer 8

Biceps brachii(flexion, supination, palm is faced upward)
Triceps brachii (extension)
Brachialis (flexion)
Brachioradialis (flexion)
Pronator teres (pronation, palm down).

Question 9

What is the carrying angle of the elbow

Answer 9

Angle formed between the humerus and the forearm when the arm is extended. 10- 15 degrees.

Question 10

Common elbow injuries

Answer 10

Tennis elbow, lateral epicondylitis.
Golfers elbow (medial epicondylitis)
Elbow dislocation
Ligament sprains

Question 11

Role of the annular ligament

Answer 11

Encircles the head of the radius and allows smooth rotation during pronation and suspination.

Question 12

How does the elbow contribute to mechanical advantage

Answer 12

Acts as a level system to enhance force and movement efficiency. Works in coordination with the shoulder and wrist for functional motion.