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Fenster schliessen

The hip bones consist of 4 bones 

  • 2 hip bones
  • Sacrum
  • Coccyx
Fenster schliessen

The hip bone is composed of what 3 divisions?

  1. ilium
  2. Ischium
  3. Pubis
In a child these three divisions are separate bones but fuse into 1 bone  in the middle teens. The fusion occurs at the acetabulu
Fenster schliessen

The Ilium is located             To the acetabulum

Superior 

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The ischium is       And      To the acetabulum

Inferior and Posterior 

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The pubis is     And     To the acetabulum 

Inferior and Anterior

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The crest (iliac crest) of the ilium is the superior margin of the ala; it extends from the Anterior Superior Iliac Spine (ASIS) to the Posterior Superior Iliac Spine (PSIS)

iliac Crest

Fenster schliessen

What are the 2  important positioning landmarks of the pelvis?

  • Iliac Crest
  • ASIS
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What do ASIS mean?

Anterior Superior Iliac Spine
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Angle of neck to shaft

  • Avg adult= 125 degrees (+/-15) depending on width of pelvis and length of lower limb
  • Ex:Long-leg/narrow pelvis-changes angle of neck to 140 degrees
  • Ex: short/wider pelvis- angle 110 to 115 degrees
Tall/Narrow ⬆️ AngleShorter/Wider ⬇️ Angle
Fenster schliessen

Longitudinal plane of femur

  • 10 degree from verticle
  • Vertical angle is nearer 15 degrees on wide pelvis/Short Limb ➡️ 5 degrees on long leg person
*This angle affects the positioning and CR angle for lateral knee ( CR 5 to 7 degrees cephalad)
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Head and neck in relation to body of femur

  • 15 to 20 degrees anterior angle
  • Head projects anteriorly/ forward
  • In positioning femur must be rotated 15 to 20 degrees.This place for femoral neck parallel to the IR for true AP projection of the proximal femur
Fenster schliessen

What is the meaning of the word pelvis?

Basin
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The greater trochanter is located     And    To the femoral shaft 

  • Superiority
  • Laterally 
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Lesser trochanter projects      And    From the junction of the neck and shaft of femur

  • Medially 
  • Postetiorly
Fenster schliessen

The trochanter are joined posteriorly by a thick ridge called        

Intertrochanter crest