Hamstring Complex

Question 1

Biceps Femoris - Long head

Answer 1

★ Insertion
Head of the fibula
★ Isolated function
Concentrically accelerates knee flexion and hip extension
Tibial external rotation
★ Integrated function
Eccentrically decelerates knee extension
Eccentrically decelerates hip flexion
Eccentrically decelerates tibial internal rotation at mid-stance of the gait cycle
Isometrically stabilizes the LPHC and knee

Question 2

Biceps Femoris - Short head

Answer 2

★ Insertion
Head of the Fibula
★ Isolated function
Concentrically accelerates knee flexion and tibial external rotation
★ Integrated function
Eccentrically decelerates knee extension
Eccentrically decelerates tibial internal rotation
Isometrically stabilizes the knee

Question 3

Semimembranosus and semitendonosus

Answer 3

★ Insertion
Posterior aspect of the medial tibial condyle of the tibia
Semitendinosus: Proximal aspect of the medial tibial condyle of the tibia
★ Isolated function
Concentrically accelerates knee flexion, hip extension, and tibial internal rotation
★ Integrated function
Eccentrically decelerates knee extension
Eccentrically decelerates hip flexion
Eccentrically decelerates tibial external rotation
Isometrically stabilizes the LPHC and knee