5010 Elbow Kinesiology

Question 1

Elbow Joint Articulations

What kind of joint?
Name ea. articulation
Axis?

Answer 1

Hinge Joint

1. humeroradial
2. humeroulnar
3. proximal radioulnar

medial-lateral axis
mvmnt is in sagittal plane

Question 2

Elbow Joint Capsule: Synovial Joints

Answer 2

3 synovial joints

• a lot of motion in synovial joints
• fibrous outer aspect w/ synovial fluid inside
• articular cartilage (smooth, avascular, aneural, thin)

Question 3

Collateral Ligaments

Answer 3

support joint capsule medially and laterally
Medial Collateral Ligament
Lateral Collateral Ligament

Question 4

Annular Ligament

Answer 4

“noose” below radial head

stabilizes humeroradial joint against traction forces

Can be torn or ripped (nursemaid’s elbow/ pulled elbow)
esp. in children

Question 5

Humeroradial Joint

Answer 5

Capitulum- Convex
Radial Head- concave

concave moves on convex
same roll and glide direction

Question 6

Humeroulnar Joint

Answer 6

Trochlea- Convex
Trochlear Notch- concave (very deep)

concave moves on convex
same roll and glide direction

Question 7

Proximal Radioulnar Joint

Answer 7

Pronation/Supination

Radial head-convex
Radial notch- concave

Convex on concave
Pronation- radial head rolls anterior, slides posterior
Supination- radial head rolls poster, slides anterior

Question 8

Elbow: Capsular pattern

Answer 8

Humeroulnar: FL > EXT
Humeroradial: FL > EXT > SUP > PRON
Proximal radioulnar: SUP > PRO

Question 9

Shoulder Extension w/ Elbow Flexion

Answer 9

Aids powerful elbow flexion

1. Length Tension
2. Shoulder extension means long head biceps doesn’t have to shorten as much, so shortening velocity is decreased

Question 10

Biceps Role in Stabilizing Shoulder

Answer 10

pulls humeral head in
improves pull of supraspinatus
helps in stability