Actions of the Knee

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Actions of the Knee
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Flexion/Extension
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Extension of the knee

• Vastus lateralis
• Vastus intermedius
• Vastus medialis
• Rectus femoris

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Flexion of the knee

• Biceps femoris
• Semitendinosus
• Semimembranosus
• Sartorius

• Gracilis
• Gastrocnemius
• Plantaris
• Popliteus

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Lateral (External) Rotation/ Medial (Internal)
Rotation
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External rotation of the knee

• Biceps femoris

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Internal rotation of the knee

• Semitendinosus
• Semimembranosus
• Popliteus
• Gracilis
• Sartorius

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Actions of the Thigh, Hip, Pelvis

• Flexion
• Extension
• Abduction
• Adduction
• Lateral (external) Rotation
• Medial (internal) Rotation

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Hip flexion

• Iliopsoas
• Pectineus
• Tensor fascia latae
• Adductor brevis

• Adductor longus
• Adductor magnus
• Rectus femoris
• sartorius

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Hip extension

• Gluteus maximus
• Biceps femoris
• Semitendinosus
• Semimembranosus
• Adductor magnus

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Hip abduction

• Gluteus medius
• Gluteus minimus
• Tensor fascia latae
• Sartorius

• Gluteus maximus
• Piriformis
• Obturator internus
• Gemellus inferior

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Hip adduction

• Adductor brevis
• Adductor longus
• Adductor magnus
• Gracilis
• Pectineus
• Gluteus maximus

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External rotation of the hip

• Piriformis
• Gemellus superior
• Obturator internus
• Gemellus inferior
• Obturator externus
• Quadratus femoris

• Gluteus maximus
• Iliopsoas
• Sartorius

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Internal rotation of the hip

• Gluteus medius
• Gluteus minimus
• Tensor fascia latae
• Pectineus

• Adductor longus
• Adductor brevis
• Adductor magnus
• Gracilis