MODULE 7

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MODULE 7

• HIP

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HIP NORMAL ANATOMY AND POSITIONING

• Three views
• AP
• Lateral
• Frog Leg

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LINES OF MENSURATION

• Teardrop distance
• Maximum of 11.0mm, minimum of 6.0mm, with an
  average of 9.0mm
• Waldenstrom sign

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Fig 3-48A Teardrop distance
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Fig 3-48A Increased Teardrop distance
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LINES OF MENSURATION

• Hip joint space width
• Three measurements
• superior
• axial
• medial (aka - teardrop)
• Pattern of collapse is very important to note

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• Hip joint space width

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LINES OF MENSURATION

• Acetabular Depth
• lt7.0mm in males and 9.0mm in females
• Dysplasia has an intact joint space
• Rheumatoid arthritis has a loss in joint space

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Acetabular Depth Fig 3.50a
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LINES OF MENSURATION

• Center-edge angle
• Represents coverage of femur head by acetabulum
• Minimum of 20o, maximum of 40o, with an average
  of 36o

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Center-edge angle Fig 3.51a
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LINES OF MENSURATION

• Symphysis Pubis Width
• Increased width is indicative of cleidocranial
  dysplasia, bladder exostrophy, HPT, trauma -
  diastasis, osteolysis - ankylosing spondylitis,
  osteopubis, gout

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Symphysis Pubis Width Fig 3.52a
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Symphysis Pubis Width Fig 3.52b
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LINES OF MENSURATION

• Acetabulur angle
• Minimum 12o, maximum 29o, with an average of 20o
• Increased angle is indicative of dysplasia,
  congenital hip dislocation
• Decreased angle is indicative of Downs syndrome

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Acetabulur angle Fig 3.54
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LINES OF MENSURATION

• Protrusio acetabuli (Kohlers line)
• Femur head should be lateral
• If acetabulum floor crosses line - idiopathic,
  rheumatoid arthritis, Pagets (osteomalacia)

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Kohlers line Fig 3.57b