Date post: | 06-Jan-2018 |
Category: |
Documents |
Upload: | merryl-watts |
View: | 228 times |
Download: | 2 times |
MODULE 7
HIP
HIP: NORMAL ANATOMY AND POSITIONING
Three views• AP• Lateral• Frog Leg
LINES OF MENSURATION
Teardrop distance Maximum of 11.0mm, minimum of 6.0mm,
with an average of 9.0mm Waldenstrom sign
Fig 3-48A
Teardrop distance
Fig 3-48A
Increased Teardrop distance
LINES OF MENSURATION
Hip joint space width Three measurements
• superior• axial• medial (aka - teardrop)
Pattern of collapse is very important to note
Hip joint space width
LINES OF MENSURATION
Acetabular Depth <7.0mm in males and 9.0mm in females Dysplasia has an intact joint space Rheumatoid arthritis has a loss in joint
space
Acetabular Depth
Fig 3.50a
LINES OF MENSURATION
Center-edge angle Represents “coverage” of femur head by
acetabulum Minimum of 20o, maximum of 40o, with an
average of 36o
Center-edge angle
Fig 3.51a
LINES OF MENSURATION
Symphysis Pubis Width Increased width is indicative of
cleidocranial dysplasia, bladder exostrophy, HPT, trauma - diastasis, osteolysis - ankylosing spondylitis, osteopubis, gout
Symphysis Pubis Width
Fig 3.52a
Symphysis Pubis Width
Fig 3.52b
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 Down’s syndrome
Acetabulur angle
Fig 3.54
LINES OF MENSURATION
Protrusio acetabuli (Kohler’s line) Femur head should be lateral If acetabulum floor crosses line - idiopathic,
rheumatoid arthritis, Paget’s (osteomalacia)
Kohler’s line
Fig 3.57b