- Extension
Origin: Femur – Anterior surface
Insertion: Tibia – Tuberosity – Patellar tendon
VASTuS MEDIALIS (INTERNuS)
Joint Action performed by the Knee
- Extension
Origin: Femur – Medial surface
Insertion: Tibia – Tuberosity – Patellar tendon
Common distortions caused by weakness include lateral tracking of patella
GASTROCNEMIuS – I. MEDIAL HEAD II. LATERAL HEAD
Joint Action performed by the Ankle and Knee
- Plantar flexion (I,II)
- Flexion (I,II) – respectively
For example it pushes forefoot down and braces back of ankle. It also raises the heel while
pushing off during gait
Origin: Femur – A. Medial condyle (Posterior, I) B. Lateral condyle (Posterior, II)
Insertions: Calcaneus – Achilles tendon (I,II)
Common distortions caused by tightness are elevated heels during a squat due to limited
dorsiflexion and increased stress on calcaneus