1. MODULE 7
HIP

2. HIP: NORMAL ANATOMY AND POSITIONING
Three views AP
Lateral
Frog Leg

3. LINES OF MENSURATION Teardrop distance
Maximum of 11.0mm, minimum of 6.0mm, with an average of 9.0mm
Waldenstrom sign

4. Fig 3-48A
Teardrop distance

5. Fig 3-48A
Increased Teardrop distance

6. LINES OF MENSURATION Hip joint space width Three measurements
superior
axial
medial (aka - teardrop)
Pattern of collapse is very important to note

7. Hip joint space width

8. 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

9. Acetabular Depth
Fig 3.50a

10. LINES OF MENSURATION Center-edge angle
Represents “coverage” of femur head by acetabulum
Minimum of 20o, maximum of 40o, with an average of 36o

11. Center-edge angle
Fig 3.51a

12. LINES OF MENSURATION Symphysis Pubis Width
Increased width is indicative of cleidocranial dysplasia, bladder exostrophy, HPT, trauma - diastasis, osteolysis - ankylosing spondylitis, osteopubis, gout

13. Symphysis Pubis Width
Fig 3.52a

14. Symphysis Pubis Width
Fig 3.52b

15. 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

16. Acetabulur angle
Fig 3.54

17. LINES OF MENSURATION Protrusio acetabuli (Kohler’s line)
Femur head should be lateral
If acetabulum floor crosses line - idiopathic, rheumatoid arthritis, Paget’s (osteomalacia)

18. Kohler’s line
Fig 3.57b