Knee Anatomy

Question 1

Gracilis

Answer 1

Origin: Inferior ramus of pubis

Insertion: Proximal, medial shaft of the tibia at pes anserinus tendon

Action: - Hip adduction

• Hip medial rotation
• Knee flexion
• Knee medial rotation when flexed

Question 2

Sartorius

Answer 2

Origin: Anterior superior iliac spine (ASIS)

Insertion: Proximal, medial shaft of the tibia at pes anserinus tendon

Action:- Hip flexion

• Hip lateral rotation
• Hip abduction
• Knee flexion
• Knee medial rotation when flexed

Question 3

Rectus Femoris

Answer 3

Origin: Anterior superior iliac spine (ASIS)

Insertion: Tibial tuberosity (via the patella and patellar ligament)

Action:- Knee extension
- Hip flexion

Question 4

Vastus Lateralis

Answer 4

Origin: Lateral lip of linea aspera, gluteal tuberosity, greater trochanter of femur

Insertion: Tibial tuberosity (via the patella and patellar ligament)

Action:- Knee extension

Question 5

Vastus Intermedius

Answer 5

Origin: Anterior and lateral shaft of femur

Insertion: Tibial tuberosity (via the patella and patellar ligament)

Action:- Knee extension

Question 6

Vastus Medialis

Answer 6

Origin: Medial lip of linea aspera

Insertion: Tibial tuberosity (via the patella and patellar ligament)

Action:- Knee extension

Question 7

Biceps Femoris

Answer 7

Origin: Long head: Ischial tuberosity
Short head: Lateral lip of linea aspera

Insertion: Head of fibula

Action:

• Knee flexion
• Knee lateral rotation when flexed
• Hip extension
• Hip medial rotation (assist)

Question 8

Semitendinosus

Answer 8

Origin: Ischial tuberosity

Insertion: Proximal, medial shaft of the tibia at pes anserinus tendon

Action:

• Knee flexion
• Knee medial rotation when flexed
• Hip extension
• Hip medial rotation (assist)

Question 9

Semimembranosus

Answer 9

Origin: Ischial tuberosity

Insertion: Posterior aspect of medial condyle of tibia

Action:

• Knee flexion
• Knee medial rotation when flexed
• Hip extension
• Hip medial rotation (assist)