Quadriceps

Question 1

Vastus Lateralis

Answer 1

Origin - Anterior and inferior border of the greater trochanter, lateral region of the gluteal tuberosity, lateral lip of the linea aspera of the femur

Insertion - Base of patella and tibial tuberosity of the tibia

Isolated Function - Concentrically accelerates knee extension

Integrated Function -

• • Eccentrically decelerates knee flexion, adduction, and internal rotation
• • Isometrically stabilizes the knee

Question 2

Vastus Medialis

Answer 2

Origin - Lower region of the intertrochanteric line, medial lip of the linea aspera, proximal medial supracondylar line of the femur

Insertion - Base of patella, tibial tuberosity of the tibia

Isolated Function - Concentrically accelerates knee extension

Integrated Function -

• • Eccentrically decelerates knee flexion, adduction, and internal rotation
• • Isometrically stabilizes the knee

Question 3

Vastus Intermedius

Answer 3

Origin - Anterior-lateral regions of the upper 2/3 of the femur

Insertion - Base of patella, tibial tuberosity of the tibia

Isolated Function - Concentrically accelerates knee extension

Integrated Function -

• • Eccentrically decelerates knee flexion, adduction, and internal rotation
• • Isometrically stabilizes the knee

Question 4

Rectus Femoris

Answer 4

Origin - Anterior-Inferior iliac spine of the pelvis

Insertion - Base of patella, tibial tuberosity of the tibia

Isolated Function - Concentrically accelerates knee extension and hip flexion

Integrated Function -

• • Eccentrically decelerates knee flexion, adduction, and internal rotation
• • Decelerates hip extension
• • Isometrically stabilizes the lumbo-pelvic-hip complex and knee