This document lists the muscles involved in various movements of the hip, knee, and ankle. At the hip, it identifies the muscles responsible for flexion, extension, medial rotation, lateral rotation, abduction, and adduction. For the knee, it lists the muscles involved in flexion, extension, medial rotation with the knee flexed, and lateral rotation with the knee flexed. Finally, it outlines the ankle invertors and everters as well as the muscles causing dorsiflexion and plantar flexion.

1. HIP MOVEMENTS
FLEXION
• Rectus Femoris
• Gluteus medius (anterior fiber)
• Gluteus minimus
• Tensor Fascia Latae
• Sartorius
• Psoas Major
• Iliacus
• Adductor magnus/ brevis/ longus
EXTENSION
• Biceps Femoris
• Semitendinosus
• Semimembranosus
• Gluteus maximus (all fibers)
• Gluteus medius (post.fibers)
• Adductor magnus (post.fibers)

2. HIP MOVEMENTS
MEDIAL ROTATION (INT.ROT.)
• Semitendonus
• Semimembranosus
• Gluteus medius (ant. Fibers)
• Gluteus minimus
• Adductor magnus
• Adductor longus
• Adductor brevis
• Gracilis
• Pectineus
• Tensor fascia latae
LATERAL ROTATION (EXT.ROT.)
• Biceps femoris
• Gluteus maximus (all fibers)
• Gluteus medius (post.fibers)
• Sartorius
• Piriformis
• Quadratus femoris
• Obturator internus & externus
• Gemellus superior & inferior
• Psoas major
• Iliacus

3. HIP MOVEMENTS
ABDUCTION
• Gluteus maximus (all fibers)
• Gluteus medius (all fibers)
• Gluteus minimus (all fibers)
• Tensor fascia latae
• Piriformis (when in hip flexion)
ADDUCTION
• Adductor magnus
• Adductor brevis
• Adductor longus
• Pectineus
• Gracilis
• Psoas major
• Iliacus
• Gluteus maximus (lower fibers)

4. KNEE MOVEMENTS
FLEXION
• Biceps femoris
• Semitendinosus
• Semimembranosus
• Gracilis
• Gastrocnemius
• Popliteus
• Plantaris (weak)
EXTENSION
• Rectus femoris
• Vastus lateralis
• Vastus medialis
• Vastus intermedius (weak)

5. KNEE MOVEMENTS
MEDIAL ROTATION - FLEXED KNEE
• Semitendinosus
• Semimembranosus
• Gracilis
• Sartorius
• Popliteus (weak)
LATERAL ROTATION - FLEXED KNEE
• Biceps femoris

7. ANKLE MOVEMENTS
INVERSION (SUPINATION )
• Tibialis anterior
• Tibialis posterior
• Flexor digitorum longus
• Flexor hallucis longus
• Extensor hallucis longus
EVERSION (PRONATION)
• Peroneus longus
• Peroneus brevis
• Extensor digitorum longus

8. ANKLE MOVEMENTS
DORSI FLEXION
• Tibialis anterior
• Extensor digitorum longus
• Extensor hallucis longus
PLANTAR FLEXION
• Gastrocnemius
• Soleus
• Tibialis posterior
• Peroneus longus (assists)
• Peroneus brevis (assists)
• Flexor digitorum longus (weak)
• Flexor hallucis longus (weak)
• Plantaris (weak)