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Quadriceps Femoris Group

A: Extend the knee (tibiofemoral joint) Rectus femoris: Flex the hip (coxal joint

O: Rectus femoris: Anterior inferior iliac spine (AIIS) Vastus medialis: Medial lip of linea aspera Vastus lateralis: Lateral lip of linea aspera, gluteal tuberosity, and greater trochanter Vastus intermedius: Anterior and lateral shaft of the femur 

I: Tibial tuberosity (via the patella and patellar ligament)

Quadriceps Femoris Group

A: All: Extend the knee (tibiofemoral joint) Rectus femoris: Flex the hip (coxal joint)

O: Rectus femoris: Anterior inferior iliac spine (AIIS) Vastus medialis: Medial lip of linea aspera Vastus lateralis: Lateral lip of linea aspera, gluteal tuberosity, and greater trochanter Vastus intermedius: Anterior and lateral shaft of the femur

I: Tibial tuberosity (via the patella and patellar ligament

Hamstrings

A: Flex the knee (tibiofemoral joint) Laterally rotate the flexed knee (T/F joint) Long head: Extend the hip (coxal joint) Long head: Assist to laterally rotate the hip (coxal joint) Tilt the pelvis posteriorly 

O: Long head: Ischial tuberosity Short head: Lateral lip of linea aspera

I: Head of the fibula

Gluteals

A: All fibers: Extend the hip (coxal joint) Laterally rotate the hip (coxal joint) Abduct the hip (coxal joint) Lower fibers: Adduct the hip (coxal joint) 

O: Coccyx, edge of sacrum, posterior iliac crest, sacrotuberous and sacroiliac ligaments

I: Iliotibial tract (upper fibers) and gluteal tuberosity (lower fibers)

Adductor Group

A: All: Adduct the hip (coxal joint) Medially rotate the hip (coxal joint) All, except gracilis: Assist to flex the hip (coxal joint) Gracilis: Flex the knee (tibiofemoral joint) Medially rotate the flexed knee (T/F joint) Posterior fibers of adductor magnus: Extend the hip (coxal joint

O: Inferior ramus of the pubis, ramus of ischium, and ischial tuberosity

I: Medial lip of linea aspera and adductor tubercle

Tensor Fasciae Latae and Iliotibial Tract

A: Flex the hip (coxal joint) Medially rotate the hip (coxal joint) Abduct the hip (coxal joint)

O: Iliac crest, posterior to the ASIS

I: Iliotibial tract

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Sartorius

A: Flex the hip (coxal joint) Laterally rotate the hip (coxal joint) Abduct the hip (coxal joint) Flex the knee (tibiofemoral joint) Medially rotate the flexed knee (T/F joint)

O: Anterior superior iliac spine (ASIS)

I: Proximal, medial shaft of the tibia at pes anserinus tendon

Tendons of the Posterior Knee

A: Laterally rotate the hip (coxal joint) Abduct the hip when the hip is flexed

Laterally rotate the hip (coxal joint) 

Laterally rotate the hip (coxal joint)

O: Anterior surface of sacrum

Lateral border of ischial tuberosity 

Obturator membrane and inferior surface of obturator foramen

I: Superior aspect of greater trochanter 

Intertrochanteric crest, between the greater and lesser trochanters

Medial surface of greater trochanter

Iliopsoas

A: With the origin fixed: Flex the hip (coxal joint) May laterally rotate the hip (coxal joint) With the insertion fixed: Flex the trunk toward the thigh Tilt pelvis anteriorly Unilaterally: Assist to laterally flex the lumbar spine 

With the origin fixed: Flex the hip (coxal joint) May laterally rotate the hip (coxal joint) With the insertion fixed: Flex the trunk toward the thigh Tilt pelvis anteriorly 

O: Bodies and transverse processes of lumbar vertebrae

Iliac fossa

I: Lesser trochanter