hip 2 Flashcards Preview

ANAT1012 - osteology, muscles & arthrology of shoulder complex > hip 2 > Flashcards

Flashcards in hip 2 Deck (18):
1

HIPJOINT ligament

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

2

iliofemoral

2 bands - y shaped inferior and superior
Extension, add. (superior portion), Lat rot

3

ischiofemoral

extension, add in hip flx, Med. rot

4

pubofemoral

e, abd

5

Muscles of the hip

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*

6

Flexors – vertical alignment & cross anteriorly

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

7

Extensors –
vertical alignment & cross posteriorly

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

8

Abductors –
vertical alignment & cross lateral

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.

9

Adductors –
vertical alignment & cross medially

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

10

Lateral rotators – cross posteriorly horizontal alignment

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

11

Medial rotators*

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

12

gluteus maximus

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

13

Muscles / muscle segments act differently in different ranges of motion

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

14

Gluteus medius

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.

15

the triradiate cartilage of the acetabulum.

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.

16

femoral anteversion

15˚

17

position of taut hip ligament

ext

18

which muscles attach to pubic symph

all adductors , gracilis