hip 2

Question 1

HIPJOINT ligament

Answer 1

Spiral–tight in hip extension(standing)
iliofemoral
ischiofemoral
pubofemoral

Question 2

iliofemoral

Answer 2

2 bands - y shaped inferior and superior

Extension, add. (superior portion), Lat rot

Question 3

ischiofemoral

Answer 3

extension, add in hip flx, Med. rot

Question 4

pubofemoral

Answer 4

e, abd

Question 5

Muscles of the hip

Answer 5

Flexors – vertical alignment & cross anteriorly
Extensors –
vertical alignment & cross posteriorly
Abductors –
vertical alignment & cross lateral
Adductors –
vertical alignment & cross medially
Lateral rotators – cross posteriorly horizontal alignment
Medial rotators*

Question 6

Flexors – vertical alignment & cross anteriorly

Answer 6

• Psoas
• Iliacus
• Tensor fascia latae
• Sartorius
• Rectus femoris
• Adductor longus

Question 7

Extensors –

vertical alignment & cross posteriorly

Answer 7

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

Question 8

Abductors –

vertical alignment & cross lateral

Answer 8

gluteus medius
• gluteus minimus
• tensor fascia latae • (sartorius)
When the tensor fascia lata is used to flex the hip, it produces an extraneous abduction torque which is greater than its hip flexion torque, indicating that the tensor fascia lata is more efficient at hip abduction than hip flexion.

Question 9

Adductors –

vertical alignment & cross medially

Answer 9

pectineus
• adductor brevis
• adductor longus
• adductor magnus • gracilis

Question 10

Lateral rotators – cross posteriorly horizontal alignment

Answer 10

piriformis
• obturator internus
• superior gemellus
• inferior gemellus
• quadratus femoris
• obturator externus
• gluteus maximus
• (gluteus medius, minimus)
• (biceps femoris, sartorius)

Question 11

Medial rotators*

Answer 11

no dedicated hip medial rotators
• in Hip F: all of gluteus med & min; piriformis
• in Hip E: anterior gluteus med & min;
semimembranosus, semitendinos

Question 12

gluteus maximus

Answer 12

all segments = hip extensor upper segments = hip abductor lower segments = hip adductor

Question 13

Muscles / muscle segments act differently in different ranges of motion

Answer 13

adductor magnus is a hip extensor
from the anatomical position to 90˚ of hip flexion (strongest in mid-range)
adductor longus and brevis: anatomical position = hip flexors
90 degrees of hip F = hip extensors

Question 14

Gluteus medius

Answer 14

0˚ flexion: anterior compartment small medial rotation moment arm, while the middle & posterior compartments have lateral rotation moment arms.
As the hip is flexed: the medial rotation moment arm of the anterior compartment increases, and the moment arms of the other compartments switch from lateral rotation to medial rotation.

Question 15

the triradiate cartilage of the acetabulum.

Answer 15

Fusion of the three components of the hip bone does not occur until the later teenage years, so that fractures may occur through what is known as the triradiate cartilage of the acetabulum. This indicates that the socket for the hip joint is not mature until early adulthood.

Question 16

femoral anteversion

Answer 16

15˚

Question 17

position of taut hip ligament

Answer 17

ext

Question 18

which muscles attach to pubic symph

Answer 18

all adductors , gracilis